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Cisco Systems UBR924 User's Manual

1. l i l j j i l I f l 100BT i i l I l l l j j j l l 1 uBR7246 CMTS MSD Maintenance Service Organization Cable companies 100BT Analog TV Ss m Upconvertor DS RF 54 860 Mhz Digital TV AV Fiver Transceiver a a a a I aes es a ns i J 80 km 1000 ft lt gt Fiber node Telephone pole e underground box eee meee Drop box Distribution Top e amplifier gt amplifier Tt gt e b Bop o o e Cisco u BR904 cable modem Troubleshooting Tips for the Cisco uBR924 Cable Access Router 7 Step 1 Understand How Basic Initialization Works Troubleshooting Steps To troubleshoot a malfunctioning cable modem perform the following tasks Step 1 Understand How Basic Initialization Works Step 2 Connect to the Cisco uBR924 Step 3 Display the Cisco uBR924 s MAC Log File Step 4 Interpret the MAC Log File and Take Action Optional Step 5 Use Additional Troubleshooting Commands Step 1 Understand How Basic Initialization Works Before you troubleshoot a Cisco uBR924 cable access router you should be familiar with the cable modem initialization process See Figure 2 and Table 1 Understanding this flowchart and sequence of events will help you determine where and why connections fail 8 The sequence numbers shown in Figure 2 are explained in Table 1 which appears after the illustration The
2. Cisco IOS Release 12 0 4 XI1 or higher must be running on the Cisco uBR924 cable access router In order to run VoIP Fax the uBR924 cable access router must be configured for voice and you must be using Cisco IOS Release 12 0 5 T or higher For multiple CoS class of service support the CMTS must allow the definition of multiple service identifiers SIDs on the upstream If the CMTS is a Cisco uBR7200 series universal broadband router Cisco IOS Release 12 0 4 XI1 or higher must be used on the headend router The Cisco uBR924 must be configured to operate in routing mode Supported MIBs and RFCs The Cisco uBR924 cable access router supports the following MIBs and RFCs e Cisco Standard MIBs Cisco Product MIB Cisco Chassis MIB Cisco Syslog MIB Troubleshooting Tips for the Cisco uUBR924 Cable Access Router 3 List of Terms List of Terms broadband Transmission system that combines multiple independent signals onto one cable In the cable industry broadband refers to the frequency division multiplexing of many signals in a wide bandwidth of RF frequencies using a hybrid fiber coaxial HFC network Cisco Flash MIB Bridge MIB IFMIB MIB II Cisco VoIP MIBs Cisco Voice IF MIB Cisco Voice Dial Control MIB Cisco Voice Analog IF MIB Cisco Dial Control MIB Radio Frequency Interface Specification Developed by the Multimedia Cable Network System MCNS consorti
3. show controllers cable modem des Displays information about the Data Encryption Standard DES engine registers show controllers cable modem filters Displays the registers in the MAC hardware that are used for filtering received frames show controllers cable modem mac Displays detailed MAC layer information for a Cisco uBR924 show controllers cable modem phy Displays the contents of the registers used in the downstream physical hardware of the Cisco uBR924 show controllers cable modem tuner Displays the settings for the upstream and downstream tuners used by a Cisco uBR924 Troubleshooting Tips for the Cisco UBR924 Cable Access Router 37 show controllers cable modem mac show controllers cable modem mac To display detailed MAC layer information for a Cisco uBR924 use the show controllers cable modem mac command in privileged EXEC mode show controllers cable modem number mac errors hardware log resets state Syntax Description number Controller number inside the Cisco uBR924 errors Optional Displays a log of the error events that are reported to SNMP This keyword enables you to look at the error events without accessing a MIB hardware Optional Displays all MAC hardware registers log Optional Displays a history of MAC log messages up to 1023 entries This is the same output that is displayed when using the debug cable modem mac log command resets Optional Extracts all of the re
4. Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar NNN N NNNNNNNNNNNNNNNNNNNNNNNNNNNN NNN NNNNN NNN NNNNNNNNNNNNNNNNNYN 01 01 01 01 01 01 o1 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 o1 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 ga 01 01 o1 o1 01 01 01 01 01 01 01 01 01 01 01 01 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 06 06 06 06 O06 06 06 06 06 06 06 O06 06 06 O06 06 06s 06 06 O06 06 06 06 06 O06 06 06 06 O06 06 06 06 LFE ELTE ro ba bs CLEFS 174 SEFI ra bag fe rn bay bs 220 203 rags 220 220 2210 s 20 220 220 220 220 720 220 12034 220 2 03 220 220 720 720 22 00 Preamble Value Offset FEC Error Correction FEC Codeword Info Bytes Scrambler Seed Maximum Burst Size Guard Time Size Last Codeword Length Scrambler on off Burst Descriptor 3 Interval Usage Code Modulation Type Differential Encoding Preamble Length Preamble Value Offset FEC Error Correction
5. dB Decibel A measure of the relative strength of two signals dBm Decibels with respect to one milliwatt A unit of RF signal strength used in satellite work and other communications applications dBmV Decibels with respect to one millivolt in a 75 ohm system The unit of RF power used in CATV work in North America DHCP Dynamic Host Configuration Protocol This protocol provides a mechanism for allocating IP addresses dynamically so that addresses can be reused when hosts no longer need them DOCSIS Data Over Cable Service Interface Specification Defines technical specifications for equipment at both subscriber locations and cable operators headends downstream The set of frequencies used to send data from a headend to a subscriber FDM Frequency Division Multiplexing A data transmission method in which a number of transmitters share a transmission medium each occupying a different frequency FEC Forward Error Correction In data transmission a process by which additional data is added that is derived from the payload by an assigned algorithm It allows the receiver to determine if certain classes of errors have occurred in transmission and in some cases allows other classes of errors to be corrected headend Central distribution point for a CATV system Video signals are received here from satellite either co located or remote frequency converted to the appropriate channels combined with locally originated
6. 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 77 PHY Reverse Lookup Table 00 08 10 18 20 28 30 38 40 48 50 58 60 68 70 78 80 0000 0000 00DC 00DC 01B8 01B8 0294 0294 0370 0370 044C 044C 0528 0604 0604 O6E0 O6E0 Cisco IOS Release 12 0 5 T 0000 0000 0O0DC o00DC 01B8 01B8 0294 0294 0370 0370 044C 044C 0528 0604 0604 O6E0 06E0 0000 0000 0ODC 0O0DC 01B8 01B8 0294 0294 0370 0370 044C 0528 0528 0604 0604 O6E0 O6E0 0000 0000 00DC 00DC 01B8 01B8 0294 0294 0370 044C 044C 0528 0528 0604 0604 O6E0 O6E0 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 77 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A
7. 864 124 CMAC LOG DRIVER INIT IDB RESET 0x080B7430 00 14 24 864 128 CMAC LOG LINK DOWN 00 14 24 864 132 CMAC LOG RESET FROM DRIVER 00 14 24 864 134 CMAC_LOG STATE CHANGE wait for link up state 00 14 24 864 138 CMAC LOG LINK UP 00 14 24 864 142 CMAC_LOG STATE CHANGE ds_channel_ scanning state 00 14 24 864 270 CMAC LOG WILL SEARCH DS FREQUENCY BAND 81 453000000 855000000 6000000 00 14 24 864 276 CMAC LOG WILL SEARCH DS FREQUENCY BAND 82 93000000 105000000 6000000 00 14 24 864 280 CMAC LOG WILL SEARCH DS FREQUENCY BAND 83 111025000 117025000 6000000 00 14 24 864 286 CMAC LOG WILL SEARCH DS FREQUENCY BAND 84 231012500 327012500 6000000 00 14 24 864 290 CMAC LOG WILL SEARCH DS FREQUENCY BAND 85 333025000 333025000 6000000 00 14 24 864 294 CMAC LOG WILL SEARCH DS FREQUENCY BAND 86 339012500 399012500 6000000 00 14 24 864 300 CMAC LOG WILL SEARCH DS FREQUENCY BAND 87 405000000 447000000 6000000 00 14 24 864 304 CMAC LOG WILL SEARCH DS FREQUENCY BAND 88 123012500 129012500 6000000 00 14 24 864 310 CMAC LOG WILL SEARCH DS FREQUENCY BAND 89 135012500 135012500 6000000 00 14 24 864 314 CMAC LOG WILL SEARCH DS FREQUENCY BAND 90 141000000 171000000 6000000 00 14 24 864 320 CMAC LOG WILL SEARCH DS FREQUENCY BAND 91 219000000 225000000 6000000 00 14 24 864 324 CMAC LOG WILL SEARCH DS FREQUENCY BAND 92 177000000 213000000 6000000 00 14 24 864 330 CMAC LOG WILL SEARCH DS FREQUENCY BAND 93 55752700 67753300 6000300 00 14 24 864 334 CMAC LOG WILL SEARC
8. FEC Codeword Info Bytes Scrambler Seed Maximum Burst Size Guard Time Size Last Codeword Length Scrambler on off MAP MESSAGE FRAME HEADER FC LEN EHDR MAC_PARM 0x0152 1 HR Il 1l 0xC3 0x02 0x42 0x00 MAC MANAGEMENT MESSAGE HEADER DA RNG RSP MESSAGE FRAME HEADER FC LEN MAC_PARM OTEO OxC2 0x00 0x2B MAC MANAGEMENT MESSAGE HEADER DA REG REQ MESSAGE C20000A5 BB610093 1F010101 04010705 080300F0 00000A03 04000000 3C2B0563 61086FD5 204D4943 00000503 000000E0 00000301 0204003D 04000186 1E112A01 04000002 01060400 6973636F 5C9D756F 202D2D2D 010100 REG RSP MESSAGE FRAME HEADER FC MAC_PARM LEN 1EA5BB60 06000004 09000304 A0060200 04000000 58040400 00025807 06105E4F 7B730710 2D2D2D2D OOFO OOFO1EB2 03010104 001E8480 0Cc070101 0A020400 00000105 04000000 C908C655 434D5453 0c040000 OxC2 0x00 0x29 2F00 0001 MAC Management 1EB2 BB61 MAC Management MAC Management with Extended Header Troubleshooting Tips for the Cisco UBR924 Cable Access Router 71 debug cable modem mac Mar 7 01 44 20 MAC MANAGEMENT MESSAGE HEADER Mar 7 01 44 20 DA OOFO 1EB2 BB61 Related Commands Command Description debug cable modem bpkm Debugs baseline privacy information on a Cisco uBR924 debug cable modem bridge Debugs bridge filter processing information on a Cisco uBR924 deb
9. cable side of the Cisco uBR924 cable access router The commands used to troubleshoot VoIP applications are documented in the Cisco IOS Release 12 0 command references show controllers cable modem show controllers cable modem bpkm show controllers cable modem des show controllers cable modem filters show controllers cable modem lookup table show controllers cable modem mac show controllers cable modem phy show controllers cable modem tuner In Cisco IOS Release 12 0 1 T or later you can search and filter the output for show and more commands This functionality is useful when you need to sort through large amounts of output or if you want to exclude output that you do not need to see To use this functionality enter a show or more command followed by the pipe character I one of the keywords begin include or exclude and an expression that you want to search or filter on command begin include exclude regular expression Following is an example of the show atm ve command in which you want the command output to begin with the first line where the expression PeakRate appears show atm vc begin PeakRate For more information on the search and filter functionality refer to the Cisco IOS Release 12 0 1 T feature module titled CLI String Search Troubleshooting Tips for the Cisco UBR924 Cable Access Router 19 show controllers cable modem show controllers cable modem To di
10. 00 14 31 871 700 CMAC LOG RANGING OFFSET SET TO 9610 00 14 31 871 704 CMAC LOG POWER LEVEL IS 32 0 dBmvV commanded 00 14 31 871 708 CMAC LOG STARTING RANGING 00 14 31 871 710 CMAC LOG RANGING BACKOFF SET 0 00 14 31 871 714 CMAC LOG RNG REQ QUEUED 0 00 14 32 872 208 CMAC LOG RNG REQ TRANSMITTED 00 14 32 872 216 CMAC LOG RNG RSP MSG RCVD 00 14 32 872 218 CMAC LOG RNG RSP SID ASSIGNED 16 00 14 32 872 222 CMAC LOG ADJUST RANGING OFFSET 2853 00 14 32 872 224 CMAC LOG RANGING OFFSET SET TO 12463 00 14 32 872 228 CMAC LOG ADJUST TX POWER 8 00 14 32 872 230 CMAC LOG POWER _LEVEL IS 34 0 dBmvV commanded 00 14 32 872 234 CMAC_LOG STATE CHANGE ranging 2 state 00 14 32 872 238 CMAC LOG RNG REQ QUEUED 16 00 14 32 872 848 CMAC LOG RNG REQ TRANSMITTED 00 14 32 872 852 CMAC LOG RNG RSP MSG RCVD Troubleshooting Tips for the Cisco UBR924 Cable Access Router 39 show controllers cable modem mac 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 PIa 232 233 3 3335 Pie e a EEE Eee pec he 333 pa 23 3 becca 233 233 393 133s E E E EEE 234 234 334i 2 34 2 34 234 234 234 2 34 2 14 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 40 14 14 14 14 14 14 14
11. 01 02 04 25 04 01 01 01 02 01 02 03 02 00 40 04 02 00 40 05 01 00 06 01 22 07 02 01 52 08 01 00 09 O01 30 OA 54 Cisco IOS Release 12 0 5 T show controllers cable modem phy Related Commands Command Description show controllers cable modem Displays high level controller information about a Cisco uBR924 cable access router show controllers cable modem bpkm Displays information about the baseline privacy key management exchange between the Cisco uBR924 and the CMTS show controllers cable modem des Displays information about the Data Encryption Standard DES engine registers show controllers cable modem filters Displays the registers in the MAC hardware that are used for filtering received frames show controllers cable modem lookup table Displays the mini slot lookup table inside a Cisco uBR924 show controllers cable modem mac Displays detailed MAC layer information for a Cisco uBR924 show controllers cable modem tuner Displays the settings for the upstream and downstream tuners used by a Cisco uBR924 Troubleshooting Tips for the Cisco UBR924 Cable Access Router 55 show controllers cable modem tuner show controllers cable modem tuner To display the settings for the upstream and downstream tuners used by a Cisco uBR9724 cable access router use the show controllers cable modem tuner command in privileged EXEC mode show controllers cable modem tuner Syntax
12. 14 14 14 14 14 14 14 234 2 34 2 34 2 34 234 232 733 233 EE 233 333 3334 233 EFS 872 856 CMAC LOG RANGING SUCCESS 872 874 CMAC LOG STATE CHANGE dhcp state 873 386 CMAC LOG DHCP ASSIGNED IP ADDRESS 188 188 1 62 873 388 CMAC LOG DHCP TFTP_ SERVER ADDRESS 4 0 0 32 873 392 CMAC LOG DHCP TOD SERVER ADDRESS 4 0 0 32 873 396 CMAC LOG DHCP_SET GATEWAY ADDRESS 873 398 CMAC_LOG DHCP TZ OFFSET 60 873 402 CMAC LOG DHCP CONFIG FILE NAME platinum cm 873 406 CMAC LOG DHCP ERROR _ACQUIRING SEC SVR_ADDR 873 410 CMAC LOG DHCP_COMPLETE 873 536 CMAC LOG STATE CHANGE establish tod_state 873 546 CMAC LOG TOD REQUEST SENT 873 572 CMAC LOG TOD REPLY RECEIVED 3140961992 873 578 CMAC LOG TOD COMPLETE 873 582 CMAC LOG STATE CHANGE security _association_state 873 584 CMAC LOG SECURITY BYPASSED 873 588 CMAC_ LOG STATE CHANGE configuration_file state 873 592 CMAC LOG LOADING CONFIG FILE platinum cm SLINEPROTO 5 UPDOWN Line protocol on Interface cable modem0 changed state to up 874 728 CMAC LOG CONFIG FILE PROCESS COMPLETE 874 730 CMAC LOG STATE CHANGE registration_state 874 734 CMAC LOG REG REQ MSG QUEUED 874 744 CMAC LOG REG REQ TRANSMITTED 874 754 CMAC LOG REG RSP MSG RCVD 874 756 CMAC LOG COS ASSIGNED SID 1 16 874 760 CMAC LOG RNG REQ QUEUED 16 874 768 CMAC LOG REGISTRATION OK 874 770 CMAC LOG REG RSP ACK MSG QUEUED 874 874 874 874 874 872 873 873 873 873 873 873 873 873
13. 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 yA 0000 0000 00DC 00DC 01B8 01B8 0294 0370 0370 044C 044C 0528 0528 0604 0604 06E0 06E0 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 77 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 77 0000 0000 00DC 00DC 01B8 0294 0294 0370 0370 044C 044C 0528 0528 0604 0604 06E0 06E0 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 77 004B 0000 00DC 0ODC 01B8 0294 0294 0370 0370 044C 044C 0528 0528 0604 0604 O6E0 O07BC 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 77 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 a A 0000 0000 00DC 01B8 01B8 0294 0294 0370 0370 044C 044C 0528 0528 0604 O6E0 06E0 07BC 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5
14. 6000000 92 333015000 333015000 6000000 93 339012500 399012500 6000000 94 405000000 447000000 6000000 95 123015000 129015000 6000000 96 135012500 135012500 6000000 97 141000000 171000000 6000000 98 219000000 225000000 6000000 99 177000000 213000000 6000000 US ID 1 US Frequency 20000000 US Power Level 34 0 dBmv US Symbol Rate 1280000 Ranging Offset 12460 Mini Slot Size 8 Change Count 4 Preamble Pattern CC Ce Ce Ce OCC CE CECU C CC Ce CO CCTC OD 0D A9 17 D9 C3 52 2F B3 86 A4 5F 67 OD 48 BE CE 1A 91 7D 9C 35 22 FB 38 6A 45 F6 70 D4 8B EC El A9 17 D9 C3 52 2F B3 86 A4 5F 67 OD 48 BE CE 1A 91 F3 F3 F3 F3 F3 F3 ES F3 F3 ES FF F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 F3 33 F7 33 F7 88 84 04 4C C4 84 CO OC 44 08 08 CC 8C OC 80 48 88 40 44 CC 48 4C 00 C4 40 80 8C C8 CO C8 04 88 Troubleshooting Tips for the Cisco uBR924 Cable Access Router 47 show controllers cable modem mac Burst Descriptor 0 Interval Usage Code 1 Modulation Type 1 Differential Encoding 2 Preamble Length 64 Preamble Value Offset 56 FEC Error Correction 0 FEC Codeword Info Bytes 16 Scrambler Seed 338 Maximum Burst Size 1 Guard Time Size 8 Last Codeword Length 1 Scrambler on off 1 Burst Descriptor 1 Interval Usage Code 3 Modulation Type 1 Differential Encoding 2 Preamble Length 128 Preamble Value Offset 0 FEC Error Correction 5 FEC Codeword Info Bytes 34 Scrambler Seed 338 Maximum Burst Size 0 Guard Time Size 48 L
15. Description There are no key words or arguments for this command Defaults No default behavior or values Command Modes Privileged EXEC Command History Release Modification 11 3 NA This command was first introduced Examples Typical Cisco uBR924 tuner settings are displayed in the following example See Table 9 for output field possibilities and descriptions uBR924 show controllers cable modem 0 tuner Tuner status 0x00 Rx tuner freq 507000000 symbol rate 5360736 local_freq 11520000 snr_estimate 17488 ber estimate 0 lock threshold 26000 QAM not in lock FEC not in lock gam_mode QAM 64 Tx tx_ freq 20000000 power _level 0x3E symbol rate 1280000 56 Cisco IOS Release 12 0 5 T show controllers cable modem tuner Table 9 Show Controllers Cable Modem Tuner Field Descriptions Field Description tuner_freq Indicates the current downstream frequency symbol_rate Indicates the downstream symbol rate in symbols per second local_freq Frequency on which the transmitter and tuner communicate snr_estimate Signal to noise estimate in dB X 1000 ber_estimate Bit error rate estimate always 0 lock_threshold Minimum signal to noise ratio SNR that the Cisco uBR924 will accept as a valid lock QAM status Indicates if QAM FEC lock has been acquired and the modulation mode in use tx_freq Upstream frequency sent to the Cisco uBR924 by the CMTS in the UCD m
16. Frequency Transmission frequency used by the Cisco uBR924 in the upstream direction US Power Level Transmit power level of the Cisco uBR924 in the upstream direction US Symbol Rate Upstream frequency in symbols per second Ranging Offset Delay correction in increments of 6 25 us 64 applied by the Cisco uBR924 to the CMTS upstream frame time derived at the Cisco uBR924 Used to synchronize the upstream transmissions in the time division multiple access TDMA scheme this value is roughly equal to the round trip delay of the Cisco uBR924 from the CMTS Mini Slot Size Size T of the mini slot for this upstream channel in units of the timebase tick of 6 25 us Allowable values are 2 4 8 16 32 64 or 128 Change Count Incremented by 1 by the CMTS whenever any of the values of this channel descriptor change If the value of this count in a sebsequent upstream channel descriptor UCD remains the same the Cisco uBR924 can quickly decide that the remaining fields have not changed and may be able to disregard the remainder of the message Preamble Pattern Byte pattern used for the preamble Burst Descriptor Interval Usage Code A compound type length value TLV encoding that defines for each type of upstream usage interval the physical layer characteristics that are to be used during that interval Each burst descriptor is given an identifying number Each upstream transmit burst belongs to a class which
17. INSTALLED KEY FOR SID 2 856 330 CMAC LOG PRIVACY ESTABLISHED Note In order for baseline privacy to work you must use a code image name on the Cisco uBR924 that contains the characters k1 In addition baseline privacy must be supported on the headend CMTS and it must be turned on in the configuration file that is downloaded to the Cisco uBR924 Troubleshooting Tips for the Cisco UBR924 Cable Access Router 17 Step 5 Use Additional Troubleshooting Commands Event 11 Enter the Maintenance State As soon as the Cisco uBR9724 has successfully completed the above events it enters the operational maintenance state and is authorized to forward traffic into the cable network 508178 322 CMAC LOG STATE CHANGE maintenance state Step 5 Use Additional Troubleshooting Commands You can use other show controllers and debug cable modem commands to troubleshoot different aspects of a Cisco uBR924 cable access router However the most useful command is the show 18 controllers cable modem 0 mac command To display additional controller information inside a Cisco uBR924 enter one or more of the following commands in privileged EXEC mode Command Purpose show controllers cable modem Displays high level controller information show controllers cable modem bpkm Displays privacy state information show controllers cable modem des Displays information about the Data Encryption Standard DES engine
18. Key Request for its SID s keying material Retry Wait Timeout Number of seconds the TEK state machine waits for a replacement key for this SID after the TEK grace timer has expired and the request for a replacement key has been made TEK Grace Time Number of seconds before the current TEK is set to expire that the TEK grace timer begins signaling the TEK state machine to request a replacement key Auth Reject Wait Time Number of seconds the Cisco uBR924 waits before sending another Authorization Request message to the CMTS after it has received an Authorization Reject message Assigned SID Service ID assigned by the CMTS for the corresponding service class Max Downstream Rate Maximum downstream rate in bits per second that the CMTS is permitted to forward to CPE unicast MAC addresses learned or configured as mapping to this Cisco uBR924 This does not include MAC packets addressed to broadcast or multicast MAC addresses Max Upstream Rate Maximum upstream rate in bits per second that the Cisco uBR924 is permitted to forward to the RF network This includes packet PDU data packets addressed to broadcast or multicast addresses Upstream Priority Relative priority assigned to this service class for data transmission in the upstream channel Higher numbers indicate higher priority Min Upstream Rate Date rate in bits per second that will be guaranteed to this service class on the upstream chann
19. baseline privacy are exchanged between the Cisco uBR924 and the headend CMTS During this event a link level encryption is performed so that a user s data cannot be sniffed by anyone else who is on the cable network Following is a trace that shows baseline privacy enabled The key management protocol is responsible for exchanging two types of keys KEKs and TEKs The KEK key exchange key also referred to as the authorization key is used by the headend CMTS to encrypt the TEKs traffic encryption keys it sends to the Cisco uBR924 The TEKs are used to encrypt decrypt the data There is a TEK for each SID that is configured to use privacy 851 088 CMAC LOG STATE CHANGE establish privacy state 851 094 CMAC LOG PRIVACY FSM STATE CHANGE machine KEK event state EVENT _1 PROVISIONED STATE A START new state STATE B AUTH WAIT 851 102 CMAC _ LOG BPKM REQ TRANSMITTED 851 116 CMAC LOG BPKM RSP MSG RCVD 851 120 CMAC_LOG PRIVACY FSM STATE CHANGE machine KEK event state EVENT 3 AUTH REPLY STATE B AUTH WAIT new state STATE _C AUTHORIZED 856 208 CMAC_ LOG PRIVACY FSM STATE CHANGE machine TEK event state EVENT 2 AUTHORIZED STATE A START new state STATE B OP WAIT 856 220 CMAC LOG BPKM REQ TRANSMITTED 856 224 CMAC LOG BPKM RSP MSG RCVD 856 230 CMAC_ LOG PRIVACY FSM STATE CHANGE machine TEK event state EVENT 8 KEY REPLY STATE B OP WAIT new state STATE D OPERATIONAL 856 326 CMAC LOG PRIVACY
20. ehdr 01 06 02 74 34 11 02 status 0x00 bd_index 0x0002 len 0x0000 hdr_len 0x0000 ehdr 01 06 02 74 34 11 03 status 0x00 bd_index 0x0003 len 0x0000 hdr_len 0x0000 ehdr 01 06 02 74 34 11 04 status 0x00 bd_index 0x0004 len 0x0000 hdr_len 0x0000 ehdr 01 06 02 74 34 11 05 status 0x00 bd_index 0x0005 len 0x0000 hdr_len 0x0000 ehdr 01 06 02 74 34 11 06 status 0x00 bd_index 0x0006 len 0x0000 hdr_len 0x0000 ehdr 01 06 02 74 34 11 07 status 0x20 bd_index 0x0007 len 0x0000 hdr_len 0x0000 ehdr 01 06 02 74 34 11 MIB Statistics DS fifo full 0 Rerequests 0 DS data overruns 0 73 DS mac msg overruns 0 Qualified maps 348 Qualified syncs CRC fails 0 HDR chk fails 0 Data pdus 0 Mac msgs 423 Valid hdrs 423 BCM3300 Registers downstream dma ds_data_bd_base 0x001D40 ds_mac_bd_base 0x001E80 ds_data_dma_ctr1l 0x98 ds_mac_dma_ctr1 0xD8 ds_dma_data_index 0x0007 ds_dma_msg_index 0x0000 upstream dma us_bd_base 0x001FB8 us_pd_base 0x002038 us_dma_ctr1l 0x80 us_dma_tx_start 0x00 Global control and status global_ctrl_status 0x00 interrupts irq _pend 0x0008 irq mask 0x00F7 Table 2 briefly describes some of the fields shown in the display For more information see the Broadcom documentation for the BCM3300 chip Table 2 Show Controllers Cable Modem Field Descriptions Field Description BCM3300 unit The unit number of this BCM3300 chip idb Interface description block number ds Downstream channe
21. interface uBR924 show controllers cable modem 0 mac resets 527986 444 CMAC LOG RESET FROM DRIVER 528302 042 CMAC LOG RESET FROM DRIVER 528346 600 CMAC LOG RESET FROM DRIVER 528444 494 CMAC LOG RESET FROM DRIVER Table 6 Possible but Uncommon Cable Interface Reset Causes Message Description CMAC LOG RESET CONFIG FILE PARSE FAILED The format of the DOCSIS configuration file acquired from the TFTP server is not acceptable CMAC LOG RESET LOSS OF SYNC Synchronization with the CMTS has been lost SYNC messages are not being received CMAC_LOG RESET T4 EXPIRED Maintenance ranging opportunities for this Cisco uBR924 are not being received from the CMTS CMAC_LOG RESET DHCP WATCHDOG EXPIRED The DHCP server took too long to respond CMAC_LOG RESET TOD WATCHDOG EXPIRED The Time Of Day server took too long to respond CMAC_ LOG RESET PRIVACY WATCHDOG EXPIRED The baseline privacy exchange with the CMTS took too long CMAC_LOG RESET CHANGE US WATCHDOG EXPIRED The Cisco uBR924 was unable to transmit a response to a UCC REQ message CMAC_LOG RESET SECURITY WATCHDOG EXPIRED The full security exchange with the CMTS took too long CMAC_LOG RESET CONFIG FILE WATCHDOG EXPIRED The TFTP server took too long to respond CMAC_LOG RESET ALL FREQUENCIES SEARCHED All downstream frequencies to be searched have been searched
22. interface debugging The command is most useful when attempting to attach a Cisco uBR924 cable access router to a CMTS that is not DOCSIS qualified For a description of the displayed fields of each message refer to the DOCSIS Radio Frequency Interface Specification v1 0 SP RFI I04 980724 uBR924 debug cable mac messages Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar 70 Cisco IOS Release 12 0 5 T 7 01 44 06 7 01 44 06 UCD MESSAGE 7 01 44 06 7 01 44 06 FRAME HEADER 7 01 44 06 FC 7 7 01 44 06 MAC_PARM x 7 01 44 06 LEN 7 01 44 06 MAC MANAGEMENT MESSAGE HEADER 7 01 44 06 DA 7 01 44 06 SA 7 01 44 06 msg LEN 7 01 44 06 DSAP 7 01 44 06 SSAP 7 01 44 06 control A 7 01 44 06 version 7 01 44 06 type 7 01 44 06 RSVD 7 01 44 06 US Channel ID 7 01 44 06 Configuration Change Count 7 01 44 06 Mini Slot Size 7 7 01 44 06 DS Channel ID 7 01 44 06 Symbol Rate 7 01 44 06 Frequency a 7 01 44 06 Preamble Pattern 7 01 44 06 Burst Descriptor 0 7 01 44 06 Interval Usage Code 7 01 44 06 Modulation Type 7 01 44 06 Differential Encoding 7 01 44 06 Preamble Length 7 01 44 06 Preamble Va
23. is given a number called the IUC interval usage code Bandwidth MAP messages are used by IUC codes to allocate upstream time slots The following types are currently defined 1 Request bandwidth request slot 2 Request Data bandwidth request or data slot 3 Initial Maintenance initial link registration contention slot 4 Station Maintenance link keep alive slot 5 Short Data Grant short data burst slot 6 Long Data Grant long data burst slot Modulation Type Upstream modulation format 1 QPSK 2 16QAM Differential Encoding Indicates whether or not differential encoding is used 1 yes 2 no Preamble Length Length of the preamble in bits This value must be an integral number of symbols a multiple of 2 for QPSK a multiple of 4 for 16QAM FEC Error Correction Length of the forward error correction in bytes The range is 0 10 bytes a value of 0 implies no forward error correction FEC Codeword Info Bytes Number of information bytes in the FEC codeword Scrambler Seed Cisco IOS Release 12 0 5 T 15 bit seed value loaded at the beginning of each burst after the register has been cleared Not used if scrambler is off show controllers cable modem mac Table 8 Show Controllers Cable Modem MAC State Field Descriptions continued Field Description Maximum Burst Size Maximum number of mini slots that can be transmitted during this burst type When the interval
24. not receiving a response within a specified time from the CMTS to a RNG REQ message during initial maintenance T4 Timeouts Number of timeouts caused by the Cisco uBR924 not receiving a response within a specified time from the CMTS to a periodic maintenance request Range Aborts Number of times the ranging process was aborted by the CMTS DS ID Identifier of the downstream channel on which this MAC management message has been transmitted This identifier is arbitrarily chosen by the CMTS and is only unique within the MAC sublayer domain DS Frequency Downstream frequency acquired by the Cisco uBR924 during its last initialization sequence Troubleshooting Tips for the Cisco UBR924 Cable Access Router 49 show controllers cable modem mac Table 8 Show Controllers Cable Modem MAC State Field Descriptions continued Field Description DS Symbol Rate Downstream frequency in symbols per second DS QAM Mode Downstream modulation scheme being used by the Cisco uBR924 DS Search Frequency bands scanned by the Cisco uBR924 when searching for a downstream channel The Cisco uBR924 s default frequency bands correspond to the North American EIA CATV channel plan for 6 MHz channel slots between 90 MHz and 858 MHz US ID Identifier of the upstream channel to which this MAC management message refers This identifier is arbitrarily chosen by the CMTS and is only unique within the MAC sublayer domain US
25. platinum cm 508176 992 CMAC_ LOG DHCP ERROR ACQUIRING SEC_SVR_ADDR 508176 996 CMAC LOG DHCP COMPLETE Event 6 Establish the Time of Day The Cisco uBR924 cable access router accesses the Time of Day server for the current date and time which is used to create time stamps for logged events The cmac_LoG ToD COMPLETE field indicates a successful time of day sequence 508177 120 CMAC_LOG STATE CHANGE establish tod_state 508177 126 CMAC_ LOG TOD REQUEST SENT 508177 154 CMAC_ LOG TOD REPLY RECEIVED 3107617539 508177 158 CMAC_ LOG TOD COMPLETE Event 7 Establish Security The Cisco uBR924 establishes a security association The security_association_state is normally bypassed since full security as defined by DOCSIS is not supported Note Full security was a request made by MSOs for a very strong authorization and authentication check by the CMTS This request has not been granted by cable modem manufacturers The Cisco uBR924 supports DOCSIS baseline privacy beginning with Cisco IOS Release 12 0 5 T which protects user s data from being sniffed on the cable network For information on baseline privacy refer to Event 10 Comply with Baseline Privacy on page 17 508177 160 CMAC_LOG STATE CHANGE security_association_state 508177 162 CMAC_ LOG SECURITY BYPASSED Cisco IOS Release 12 0 5 T Step 4 Interpret the MAC Log File and Take Action Event 8 Transfer Operational Parameters Af
26. registers show controllers cable modem filters Displays information about the MAC and SID filters show controllers cable modem lookup table Displays the Cisco uBR924 s internal mini slot lookup table show controllers cable modem mac errors hardware log resets state Displays detailed MAC layer information show controllers cable modem phy Displays physical layer information such as receive and transmit physical registers show controllers cable modem tuner Displays tuning information show interface cable modem Displays information about the Cisco uBR924 interface To debug different components of a Cisco uBR924 enter one or more of the following commands in privileged EXEC mode Command Purpose debug cable modem bpkm errors events packets Debugs baseline privacy information debug cable modem bridge Debugs the bridge filter debug cable modem error Debugs cable interface errors debug cable modem interrupts Debugs Cisco uBR924 interface interrupts debug cable modem mac log verbose messages Displays and debugs the MAC layer log entries in real time debug cable modem map Debugs map message processing information Cisco IOS Release 12 0 5 T Step 5 Use Additional Troubleshooting Commands Command Reference This section describes the commands used in Cisco IOS Release 12 0 5 T for troubleshooting the
27. scheme used in the downstream direction Tx tx_freq Upstream frequency sent to the Cisco uBR924 by the CMTS in the UCD message power_level Transmit power level as set in the hardware expressed as a hexadecimal value The units are unique to the hardware used Use the show controllers cable modem 0 mac state command to see the power level in dBmV symbol_rate Upstream frequency in symbols per second TFTP server IP address of the TFTP server at the headend TOD server IP address of the time of day server at the headend Security server IP address of the security server at the headend Timezone Offset Correction received from the DHCP server to synchronize the Cisco uBR924 time clock with the CMTS Config filename Name of the file stored on the cable company s TFTP server that contains operational parameters for the Cisco uBR924 buffer size Size in bytes of the BCM3300 message buffers RX data PDU ring Indicates the memory location of the beginning of buffer information for the receive data ring rx_head Indicates current head buffer descriptor IX_p Indicates current head packet descriptor RX MAC message ring Indicates the memory location of the beginning of buffer information for the receive rx_head_mac MAC message ring Indicates current head buffer descriptor rX_p_mac Indicates current head packet descriptor TX BD ring Indicates the memory location of th
28. signals and rebroadcast onto the HFC plant For a CATV data system the headend is the typical place to create a link between the HFC system and any external data networks HFC Hybrid fiber coaxial cable network Older CATV systems were provisioned using only coaxial cable Modern systems use fiber transport from the headend to an optical node located in the neighborhood to reduce system noise Coaxial cable runs from the node to the subscriber The fiber plant is generally a star configuration with all optical node fibers terminating at a headend The coaxial cable part of the system is generally a trunk and branch configuration host Any end user computer system that connects to a network In this document the term host refers to the computer system connected to the LAN interface of the cable access router ingress noise Over the air signals that are inadvertently coupled into the nominally closed coaxial cable distribution system Ingress noise is difficult to track down and intermittent in nature Troubleshooting Tips for the Cisco uUBR924 Cable Access Router 5 List of Terms MAC layer Media Access Control sublayer Controls access by the cable access router to the CMTS and to the upstream data slots MCNS Multimedia Cable Network System Partners Ltd A consortium of cable companies providing service to the majority of homes in the United States and Canada This consortium has decided to drive a standard with the goal of hav
29. such that the transmissions of a cable access router are aligned with the correct mini slot boundary RF Radio frequency The portion of the electromagnetic frequency spectrum from 5 MHz to approximately 860 MHz SECAM TYV system used in France and elsewhere utilizing an 8 MHz wide modulated signal SID Service ID A number that defines at the MAC sublayer a particular mapping between a cable access router CM and the CMTS The SID is used for the purpose of upstream bandwidth allocation and class of service management Signal to Noise S N also SNR The difference in amplitude between a baseband signal and the noise in a portion of the spectrum spectrum reuse CATV s most fundamental concept Historically the over the air spectrum has been assigned to many purposes other than that of carrying TV signals This has resulted in an inadequate supply of spectrum to serve the needs of viewers Cable can reuse spectrum that is sealed in its aluminum tubes subscriber unit SU An alternate term for cable access router See cable access router upstream The set of frequencies used to send data from a subscriber to the headend 6 Cisco IOS Release 12 0 5 T List of Terms CMTS to Cable Modem Network Topology Figure 1 shows the physical relationship between the devices in the HFC network and the Cisco uBR9724 cable access router Figure 1 Sample Topology IP related ATM FDDI 100BT 100BT ISP home
30. the Cisco uBR924 Cable Access Router 73 debug cable modem map Related Commands 74 Command Description debug cable modem bpkm Debugs baseline privacy information on a Cisco uBR924 debug cable modem bridge Debugs bridge filter processing information on a Cisco uBR924 debug cable modem error Enables debugging messages for the cable interface driver on a Cisco uBR924 debug cable modem interrupts Debugs Cisco uBR924 interrupts debug cable modem mac Troubleshoots the Cisco uBR924 MAC layer Cisco IOS Release 12 0 5 T
31. type is Short Data Grant this value must be greater than 0 If this value is 0 the burst size is limited elsewhere Guard Time Size Amount of time in symbols between the center of the last symbol of a burst and the center of the first symbol of the preamble of an immediately following burst in an upstream transmission from the Cisco uBR924 to the CMTS Last Codeword Length Indicates whether or not the length of the last codeword is fixed or shortened 1 fixed 2 shortened Scrambler on off Indicates whether or not a scrambler is enabled in the upstream modulator 1 on 2 off Network Access Indicates whether or not the Cisco uBR924 has access to the HFC network Vendor ID Unique identifier specifying the cable modem manufacturer Auth Wait Timeout Number of seconds the Cisco uBR924 waits for a reply after sending the Authorization Request message to the CMTS Reauth Wait Timeout Number of seconds the Cisco uBR924 waits for a reply after it has sent an Authorization Request message to the CMTS in response to a reauthorization request or an Authorization Invalid message from the CMTS Auth Grace Time Number of seconds before the current authorization is set to expire that the grace timer begins signaling the Cisco uBR9724 to begin the reauthorization process Op Wait Timeout Number of seconds the TEK state machine waits for a reply from the CMTS after sending its initial
32. with the CMTS Related Commands Command Description show controllers cable modem Displays high level controller information about a Cisco uBR924 cable access router show controllers cable emodem bpkm Displays information about the baseline privacy key management exchange between the Cisco uBR924 and the CMTS show controllers cable modem des Displays information about the Data Encryption Standard DES engine registers show controllers cable modem filters Displays the registers in the MAC hardware that are used for filtering received frames show controllers cable modem lookup table Displays the mini slot lookup table inside a Cisco uBR924 show controllers cable modem phy Displays the contents of the registers used in the downstream physical hardware of the Cisco uBR924 show controllers cable modem tuner Displays the settings for the upstream and downstream tuners used by a Cisco uBR924 Cisco IOS Release 12 0 5 T show controllers cable modem phy show controllers cable modem phy To display the contents of the registers used in the downstream physical hardware of the Cisco uBR924 cable access router use the show controllers cable modem phy command in privileged EXEC mode show controllers cable modem phy receive transmit Syntax Description receive Displays all receiver registers in the downstream physical hardware transmit Displays all transmitter
33. 00 ehdr 00 00 00 2E FF FF 01 status 0x00 bd_index 0x0001 ehdr 00 00 00 2E FF FF 02 status 0x00 bd_index 0x0002 ehdr 00 00 00 2E FF FF 03 status 0x00 bd_index 0x0003 ehdr 00 00 00 2E FF FF 04 status 0x00 bd_index 0x0004 ehdr 00 00 00 2E 00 00 05 status 0x00 bd_index 0x0005 ehdr 00 00 00 2E 00 00 06 status 0x00 bd_index 0x0006 ehdr 00 00 00 00 00 00 07 status 0x20 bd_index 0x0007 ehdr 00 00 00 00 00 00 MIB Statistics DS fifo full DS mac msg overruns 0 Rerequests 0 0 DS data len 0x0000 len 0x0000 len 0x0000 len 0x0000 len 0x0000 len 0x0000 len 0x0000 len 0x0000 overruns Qualified maps 0 Qualified syncs 0 CRC fails 0 HDR chk fails 0 Data pdus 0 Mac msgs 0 Valid hdrs 0 BCM3300 Registers downstream dma ds_data_bd_base 0x001D40 ds_data_dma_ctr1 0x98 tx_count 0 hdr_len 0x0000 hdr_len 0x0000 hdr_len 0x0000 hdr_len 0x0000 hdr_len 0x0000 hdr_len 0x0000 hdr_len 0x0000 hdr_len 0x0000 0 ds_mac_bd_base 0x001E80 ds_mac_dma_ctr1 0x98 ds_dma_data_index 0x0000 ds_dma_msg_index 0x0000 upstream dma us_bd_base 0x001FB8 us_pd_base 0x002038 us_dma_ctr1l 0x00 us_dma_tx_start 0x00 global control and status global_ctrl_status 0x00 interrupts irq pend 0x0018 irq _mask 0x00E7 timing recovery circuit loop _enable 0x00 minislot_divisor 0x00 KO_ctrl 0x06 K1_ctr1l 0x07 err_threshhold 0x04 timeout_threshold 0xFF nco_bias 0x
34. 012500 6000000 508144 370 CMAC LOG WILL SEARCH DS FREQUENCY BAND 94 405000000 447000000 6000000 508144 372 CMAC LOG WILL SEARCH DS FREQUENCY BAND 95 123015000 129015000 6000000 508144 376 CMAC LOG WILL SEARCH DS FREQUENCY BAND 96 135012500 135012500 6000000 508144 380 CMAC LOG WILL SEARCH DS FREQUENCY BAND 97 141000000 171000000 6000000 508144 382 CMAC LOG WILL SEARCH DS FREQUENCY BAND 98 219000000 225000000 6000000 508144 386 CMAC LOG WILL SEARCH DS FREQUENCY BAND 99 177000000 213000000 6000000 508144 390 CMAC LOG WILL SEARCH SAVED DS FREQUENCY 699000000 508145 540 CMAC_LOG UCD MSG _RCVD 3 508146 120 CMAC LOG DS 64QAM LOCK ACQUIRED 699000000 508146 122 CMAC LOG DS CHANNEL SCAN COMPLETED A frequency band is a group of adjacent channels These bands are numbered from 88 to 99 Each band has starting and ending digital carrier frequencies and a 6 MHz step size For example a search of EIA channels 95 97 is specified using band 89 The starting frequency is 93 MHz the ending frequency is 105 MHz The Cisco uBR924 s default frequency bands correspond to the North American EIA CATV channel plan for 6 MHz channel slots between 90 MHz and 858 MHz For example EIA channel 95 occupies the slot 90 96 MHz The digital carrier frequency is specified as the center frequency of 93 MHz Channel 95 is usually specified using the analog video carrier frequency of 91 25 MHz which lies 1 75 MHz below the center of the slot 14 Cisco IOS Release 12 0 5 T
35. 05 O05 QS O05 O05 O05 O05 O5 O05 O05 O05 O05 OS O05 QF Example 1 This example shows sample display output from the debug cable modem mac log command The fields of the output are the time since bootup the log message and in some cases a parameter that gives more detail about the log entry cable modem mac log 259 5 92 528302 528302 040 042 CMAC_ CMAC_1 OG LINK RESET DOWN FROM DRIVER 528302 528302 046 044 CMAC LOG STATE CMAC 1I CHANGE DRIVER_INIT_IDB SHUTDOWN 528302 048 528308 428 CMAC_ CMAC_1 OG LINK _ DOWN DRIVER_INIT_IDB RESET 528308 432 528308 434 528308 436 528308 440 CMAC CMAC NK INK UP CMAC WILL SEA DOWN CMAC_LOG STATE CHANGE RCH DS Tj 528308 444 CMAC WILL SEA RCH DS Tj 528308 448 CMAC WILL SEA RCH DS 528308 452 CMAC WILL SEA RCH DS Tj 528308 456 CMAC SEA RCH DS Tj 528308 460 CMAC SEA RCH DS Tj 528308 462 CMAC SEA RCH DS 528308 466 CMAC SEA RCH DS Tj 528308 470 CMAC SEA RCH DS Tj 528308 474 CMAC SEA RCH DS 528308 478 CMAC SEA RCH DS 528308 482 CMAC WILL SEA RCH DS 528308 486 CMAC WILL SEA RCH SAVE F F REQUENCY BAN REQUENCY BAN REQUENCY BAN REQUENCY BAN REQUENCY BAN REQUENCY BAN REQUENC
36. 31012500 327012500 6000000 92 333015000 333015000 6000000 93 339012500 399012500 6000000 94 405000000 447000000 6000000 95 123015000 129015000 6000000 96 135012500 135012500 6000000 97 141000000 171000000 6000000 98 219000000 225000000 6000000 99 177000000 213000000 6000000 663000000 663000000 663000000 establish privacy state maintenance state wait_for_link_up_state 0x08098D02 debug cable modem mac 0 events dropped due to lack of a chunk The line o events dropped due to lack of a chunk at the end of a display indicates that no log entries were discarded due to a temporary lack of memory This means the log is accurate and reliable Example 2 The following example compares the output of the debug cable modem mac log command with the debug cable modem mac log verbose command The verbose keyword displays periodic events such as ranging uBR924 debug cable mac log Cable Modem mac log debugging is on uBR924 uBR924 debug cable mac log verbose Cable Modem mac log debugging is on verbose uBR924 574623 574623 574627 574633 574633 574643 574643 574654 574654 574657 574664 574664 574674 574674 uBR924 810 812 942 880 884 950 954 022 024 978 094 096 164 166 no CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG RSP MSG _RCVD CMAC_LOG WATCHDOG TIMER CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG RSP MSG _RCVD CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG RSP MSG _RCVD
37. 48 508148 508148 508148 508148 508148 508148 508148 508177 508177 508178 508178 508178 508178 508178 508178 508178 508178 390 540 120 508146 508146 554 558 558 622 624 508148 508148 508148 508148 508148 508148 508148 508148 7562 566 568 508148 572 574 576 578 580 508155 508155 508155 508155 508155 508165 508165 508165 508165 508165 508175 508175 508175 508175 508176 508176 508176 508176 508176 508176 508176 508176 508177 126 508177 508177 508177 508177 164 508177 280 300 302 306 310 312 314 316 122 124 058 060 062 064 066 068 070 072 570 820 824 826 826 828 892 894 896 898 900 962 964 966 968 982 984 986 988 988 990 992 996 120 154 158 160 162 166 Cisco IOS Release 12 0 5 T CMAC_LOG WILL SEARCH SAVED DS FREQUENCY CMAC_LOG UCD MSG_RCVD CMAC_LOG DS 64QAM LOCK ACQUIRED CMAC_LOG DS CHANNEL SCAN COMPLETED CMAC_LOG STATE CHANGE CMAC_LOG UCD MSG_RCVD CMAC_LOG UCD NEW US FREQUENCY CMAC LOG SLOT SIZE CHANGED CMAC_LOG FOUND US CHANNEL CMAC_LOG STATE CHANGE CMAC_LOG MAP MSG_RCVD CMAC_LOG INITIAL RANGING MINISLOTS CMAC_LOG STATE CHANGE CMAC_LOG RANGING OFFSET SET TO CMAC_LOG POWER LEVEL IS CMAC_LOG STARTING RANGING CMAC_LOG RANGING BACKOFF SET CMAC_LOG RNG REQ QUEUED CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG RSP MSG _RCVD CMAC_LOG RNG _RSP_SID_ ASSIGNED C
38. 4F7004F7 ranging offset 0x00000000 ts_err 0x00 timeout_err 0x00 spi dynamic_ctr1l 0x09 sync_valid 0x00 delta_F 0x00 acq_threshhold 0x01 static_ctr 0x9F autonomous 0x01 irq _ack 0x00 spi_cmd 0x51 spi_addr 0x11 spi_data FF 00 00 00 00 00 00 Troubleshooting Tips for the Cisco UBR924 Cable Access Router 45 show controllers cable modem mac 46 burst profiles profile 0 profile 1 profile 2 profile 3 01 00 00 00 01 00 00 00 01 00 00 00 00 00 00 00 19 00 00 00 19 00 00 00 19 00 00 00 00 00 00 00 1D 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1D 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1D 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Most of the fields in this display are described in Table 2 Show Controllers Cable Modem Field Descriptions Table 7 describes the MIB statistics shown in the display Table 7 Show Cont
39. 774 778 780 784 788 CMAC_ CMAC LOG STATE CHANGE LOG PRIVACY NOT CONFIGURED CMAC CMAC LOG STATE CHANGE LOG REG RSP ACK MESSAGE EVENT CMAC LOG REG RSP ACK MSG SENT establish privacy state maintenance state If the DHCP server cannot not be reached the error will look like this in the MAC log 874 386 388 386 v3 92 396 398 402 406 CMAC_ CMAC CMAC LOG STATE CHANGE LOG RNG REQ TRANSMITTED LOG RNG RSP MSG RCVD CMAC CMAC LOG RNG REQ TRANSMITTED LOG RNG RSP MSG RCVD CMAC CMAC LOG_WATCHDOG_TIMER LOG_RESET_DHCP_WATCHDOG_EXPIRED CMAC CMAC LOG STATE CHANGE LOG DHCP PROCESS KILLED dhcp state reset_interface_ state The fields in this display are explained in the section Step 4 Interpret the MAC Log File and Take Action on page 13 Cisco IOS Release 12 0 5 T show controllers cable modem mac Example 2 Example 3 MAC error log information is displayed in the following example which is also reported via SNMP uBR924 show controllers cable modem 0 mac errors 74373 574 RO2 0 No Ranging Response received T3 time out 74374 660 RO2 0 No Ranging Response received T3 time out 74375 508 R02 No Ranging Response received T3 time out 74375 748 R02 No Ranging Response received T3 time out 74375 748 R03 Ranging Request Retries exhausted 74376 112 R02 Ranging Response received T3 time out 74376 354 R02 No Ranging Respo
40. 7E7D lddri 007EFO FEC correctable error count 0 FEC uncorrectable error count 0 Bit Error Rate Count 0 Physical transmit registers are displayed in the following example uBR924 show controllers cable modem 0 phy transmit BCM3037 Transmitter Registers part_id 3037 rev_id 01 test_mode 00 test_input 00 test_misc 2009 rst 00 power 0000 power 2 00 port 6F pll F7 map 66 mod 28 tx_oen bdly 14 tx_oen_edly C8 prbs_cfg 00C000 baud 1A36E3 burst 0000 if_ freq 200000 dac 37 tx_config 00 burst config 0 prbs_ init FFFFFF rs 343E fec 00 qam 01 pream_len 0018 offset 0000 burst config 1 prbs_init FFFFFE rs 033B fec s IC qam 65 pream _len 0000 offset 0000 burst config 2 prbs_init FFFFFE rs 033B fec 1D qam 65 pream _len 0000 offset 0000 burst config 3 prbs_init FFFFFE rs 033B fec 1E qam 65 burst config 4 prbs_init FFFFFE rs 033B fec 1F qam 65 pream _len 0000 offset 0000 burst config 5 prbs_init FFFFFE rs 033B fec OF qam 66 pream_len 0000 offset 0000 Eq Coeff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 Preamble values CC CE CC CE CC 0D OD CE EC CEC CE GECE CE EC OD 04 25 01 01 01 01 02 01 02 03 02 00 40 04 02 00 40 05 01 00 06 01 10 O07 02 O01 52 08 01 01 09 OL 08 OA 01 01 OB 01 02 04 25 03 01 01 01 02 01 02 03 02 00 50 04 02 00 30 05 01 00 06 O01 22 O07 02 01 52 08 01 00 09 01 30 OA 01 01 OB
41. A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 68 TA 77 77 77 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 77 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 77 show controllers cable modem lookup table 88 07BC 07BC 07BC 07BC 07BC 07BC 07BC 07BC 90 07BC 07BC 07BC 07BC 07BC 0898 0898 0898 98 0898 0898 0898 0898 0898 0898 0898 0898 AO 0898 0898 0898 0974 0974 0974 0974 0974 A8 0974 0974 0974 0974 0974 0974 0974 0974 BO 0974 0974 0A50 0A50 0A50 0A50 0A50 0A50 B8 0A50 0A50 0A50 0A50 0A50 0A50 0A50 0A50 Co 0A50 0B2C 0B2C 0B2C 0B2C 0B2C 0B2C 0B2C C8 0B2C 0B2C 0B2C 0B2C 0B2C 0B2C 0B2C 0B2C DO 0CO8 0CO8 0CO8 OC08 0CO8 OC0O8 OC08 0C08 D8 0CO8 0CO8 0CO8 0CO8 0CO8 0C08 OCE4 OCE4 EO OCE4 OCE4 OCE4 OCE4 OCE4 OCE4 OCE4 0CE4 E8 OCE4 OCE4 OCE4 OCE4 0CE4 ODCO ODCO 0DCO FO ODCO ODCO ODCO ODCO ODCO ODCO ODCO oDCO F8 ODCO ODCO ODCO ODCO 0E9C 0E9C 0E9C OEIC Related Commands Command Description show controllers cable modem Displays high level controller information about a Cisco uBR924 cable access router show controllers cable emodem bpkm Displays information about the baseline privacy key management exchange between the Cisco uBR924 and the CMTS
42. AC_LOG POWER LEVEL 1s field is the power level that the CMTS told the Cisco uBR924 to adjust to The cMAc_LOG RANGING succEss field indicates that the ranging adjustment was successful 508148 508148 508148 508148 508148 508148 508148 508148 508148 508148 508148 508148 508148 508148 508148 508155 508165 508165 508165 062 064 066 068 070 072 562 566 568 570 572 574 576 578 580 820 508155 508155 508155 508155 508165 508165 824 826 826 828 892 894 896 898 900 508175 508175 508175 962 964 966 CMAC_LOG STATE CHANGE CMAC_LOG RANGING OFFSET SET TO CMAC_LOG POWER LEVEL IS CMAC_LOG STARTING RANGING CMAC_LOG RANGING BACKOFF SET CMAC_LOG RNG REQ QUEUED CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG RSP MSG _RCVD CMAC_LOG RNG _RSP_SID_ ASSIGNED CMAC_LOG ADJUST RANGING OFFSET CMAC_LOG RANGING OFFSET SET TO CMAC_LOG ADJUST_TX POWER CMAC_LOG POWER LEVEL IS CMAC_LOG STATE CHANGE CMAC_LOG RNG REQ QUEUED CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG RSP MSG _RCVD CMAC_LOG ADJUST RANGING OFFSET CMAC_LOG RANGING OFFSET SET TO CMAC_LOG RANGING CONTINUE CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG RSP _MSG_RCVD CMAC_LOG ADJUST_TX POWER CMAC_LOG POWER LEVEL IS CMAC_LOG RANGING CONTINUE CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG _RSP_MSG_RCVD CMAC_LOG RANGING SUCCESS ranging 1 state 9610 28 0 dBmV co
43. C 3C 3C 3C 3C 3C 3C 3C 2CO0 3CU3C 3C3C 3C G 3C 3O 36 36 3636 36536 3eE 36 2D0 BC BC43C 3C 8C 3 SC SCKSe 3C SC 3C SC 3 BC 3c 2E0 3G 3C 3C BCx3C 36 3 C43 C 3C 36 3C B13 C SE 38e SE 2F0 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 300 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 310 3C 3C 3C BC 3 3C3C BC BSC 2E 3C 36 SC 3e 3C 3 320 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 33 0 ELORE CES 3C 3C3C 3C 3 3C 3C 3C SE 36 36 36 36 340 3C 3C 3C 3 C 3C 3C 3C 3 3C 3C 3C 3C 3C 3 3C 3 350 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 360 3C BCC BC 3C 3C3C 3E 3C 3C BC 3C 3E 3C 3C 3C Troubleshooting Tips for the Cisco UBR924 Cable Access Router 35 show controllers cable modem lookup table 36 370 380 390 3A0 3B0 3C0 3D0 3E0 3F0 400 410 420 430 440 450 460 470 480 490 4A0 4BO 4CO ADO 4E0 4F0 500 510 520 530 540 550 560 570 580 590 5A0 5B0 5CO0 5D0 5E0 5FO 600 610 620 630 3C 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 5A 68 68 68 68 68 68 68 68 68 68 68 68 68 68 77 77 77 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 5A 5A 5A 5A 5A
44. CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG RSP MSG RCVD CMAC_LOG WATCHDOG TIMER CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG RSP MSG _RCVD CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG RSP MSG RCVD debug cable mac log verbose Cable Modem mac log debugging is off uBR924 574684 234 CMAC LOG RNG REQ TRANSMITTED 574684 238 CMAC LOG RNG RSP MSG RCVD Example 3 The following example shows display output for the debug cable mac messages command This command causes received cable MAC management messages to be displayed in a verbose format The messages that are displayed are shown below uBR924 debug cable modem mac messages dynsrv map reg req reg rsp rng req rng rsp sync ucc req ucc rsp ucd eer dynamic service mac messages Map messages received reg req messages transmitted reg rsp messages received rng req messages transmitted rng rsp messages received Sync messages received ucc req messages received ucc rsp messages transmitted UCD messages received The dynsrv keyword displays Dynamic Service Add or Dynamic Service Delete messages during the off hook on hook transitions of a phone connected to the Cisco uBR924 Troubleshooting Tips for the Cisco UBR924 Cable Access Router 69 debug cable modem mac In addition transmitted REG REQs are displayed in hex dump format The output from this command is very verbose and is usually not needed for normal
45. Cisco uBR924 s DMA controller had downstream data and there were no free data PDU buffer descriptors to accept the data Qualified maps Number of times a MAP message passed all filtering requirements and was received by the Cisco uBR924 Qualified syncs Number of times a timestamp message was received by the Cisco uBR924 CRC fails Number of times a MAC message failed a cyclic redundancy CRC check HDR chk fails Number of times a MAC header failed its 16 bit CRC check The MAC header CRC is a 16 bit Header Check Sequence HCS field that ensures the integrity of the MAC header even in a collision environment Data pdus Total number of data PDUs protocol data units of all types received by the Cisco uBR924 Mac msgs Number of MAC messages received by the Cisco uBR924 Valid hdrs Number of valid headers received by the Cisco uBR924 including PDU headers MAC headers and headers only Global control and status Used to reset the BCM3300 chip interrupts Hexadecimal values of the pending IRQ interrupt and IRQ mask Cisco IOS Release 12 0 5 T show controllers cable modem Related Commands Command Description show controllers cable modem bpkm Displays information about the baseline privacy key management exchange between the Cisco uBR924 and the CMTS show controllers cable modem des Displays information about the Data Encryption Standard DES engine registers show cont
46. Cisco uBR924 will complete all the steps in this flowchart each time it needs to reestablish ranging and registration with the CMTS Cisco IOS Release 12 0 5 T Step 1 Understand How Basic Initialization Works Figure 2 Cable Modem Initialization Flowchart Scan for 4 downstream Establish channel security Downstream sync Security established established Obtain Transfer 2 upstream operational 7 parameters parameters Upstream Transfer arameter gt peer complete Register with Start the Cisco 3 ranging uBR7246 cea T Registration completed complete Establish Baseline 4 IP privacy connectivety initialization gt IP Baseline privacy compete initialized Establish 5 time of Operational day Time of day established 12960 Troubleshooting Tips for the Cisco uUBR924 Cable Access Router 9 Step 2 Connect to the Cisco uBR924 Step 2 Connect to the Cisco uBR924 10 Table 1 Cable Modem Initialization Sequences and Events Sequence Event Description 1 Scan for a downstream channel and establish synchronization with the CMTS The Cisco uBR924 acquires a downstream channel from the CMTS and saves the last operational frequency in non volatile memory The Cisco uBR9724 tries to reacquir
47. E4 pak 0x82DCEEC pak 0x82DCCF4 pak 0x82DCAFC pak 0x82DC904 pak 0x82DC70C pak 0x82DC514 pak 0x82DC31C pak 0x82DC124 D D D D D D D D message ring with 8 entries at 0x201E80 rx_p mac pak 0x82E0DEC pak 0x82E021C pak 0x82E060C pak 0x82E11DC pak 0x82DFC34 pak 0x82E09FC pak 0x82DEE6C pak 0x82DFA3C Cisco IOS Release 12 0 5 T 0x201EB0 0 YX p buf 0x227F1A buf 0x22C56A buf 0x22710A buf 0x227812 buf 0x229B3A buf 0x21B332 buf 0x229432 buf 0x22D37A buf 0x2262FA buf 0x2254EA buf 0x224DE2 buf 0x2246DA buf 0x223FD2 buf 0x2238CA buf 0x2231C2 buf 0x222ABA buf 0x2223B2 buf 0x221CAA buf 0x2215A2 buf 0x220E9A buf 0x220792 buf 0x22008A buf 0x21F982 buf 0x21F27A buf 0x21EB72 buf 0x21E46A buf 0x21DD62 buf 0x21D65A buf 0x21CF52 buf 0x21C84A buf 0x21C142 buf 0x21BA3A 6 buf 0x22CC72 buf 0x22A242 buf 0x22B052 buf 0x22DA82 buf 0x228D2A buf 0x22BE62 buf 0x225BF2 buf 0x228622 0x82D4760 0 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0xA0 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0
48. H DS FREQUENCY BAND 94 79753900 85754200 6000300 00 14 24 864 340 CMAC LOG WILL SEARCH DS FREQUENCY BAND 95 175758700 211760500 6000300 00 14 24 864 344 CMAC LOG WILL SEARCH DS FREQUENCY BAND 96 121756000 169758400 6000300 00 14 24 864 348 CMAC LOG WILL SEARCH DS FREQUENCY BAND 97 217760800 397769800 6000300 00 14 24 864 354 CMAC LOG WILL SEARCH DS FREQUENCY BAND 98 73753600 115755700 6000300 00 14 24 864 358 CMAC LOG WILL SEARCH DS FREQUENCY BAND 99 403770100 997799800 6000300 00 14 24 864 364 CMAC LOG WILL SEARCH SAVED DS FREQUENCY 213000000 00 14 25 865 450 CMAC LOG UCD MSG RCVD 1 00 14 25 SLINK 3 UPDOWN Interface cable modem0 changed state to up 00 14 26 866 200 CMAC LOG DS 64QAM LOCK ACQUIRED 213000000 00 14 26 866 204 CMAC LOG DS CHANNEL SCAN COMPLETED 00 14 26 866 206 CMAC_ LOG STATE CHANGE wait_ucd_state 00 14 26 SLINEPROTO 5 UPDOWN Line protocol on Interface cable modem0O changed state to down 00 14 27 867 456 CMAC LOG UCD MSG RCVD 1 00 14 29 869 470 CMAC LOG UCD MSG RCVD 1 00 14 29 869 472 CMAC LOG ALL UCDS FOUND 00 14 29 869 476 CMAC_ LOG STATE CHANGE wait_map state 00 14 29 869 480 CMAC LOG UCD NEW US FREQUENCY 20000000 00 14 29 869 484 CMAC LOG SLOT SIZE CHANGED 8 00 14 29 869 564 CMAC LOG FOUND_US_ CHANNEL T 00 14 31 871 484 CMAC LOG UCD MSG RCVD 1 00 14 31 871 692 CMAC LOG MAP MSG RCVD 00 14 31 871 694 CMAC LOG INITIAL RANGING MINISLOTS 40 00 14 31 871 696 CMAC_ LOG STATE CHANGE ranging 1 state
49. LF 1F 100 LE LE IP IP IF IE IPAP IFE IE IPF TE PE TE LE 110 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 120 TE 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F IE 1F 130 1F 1F 1F 1F 1F 1F 1F JE 1F 1F 1F 1F 1F IF 1F AF 140 IF ITP IF IF IF IF TF IP 1F LIF 1F IF EF IF IF LE 150 LF LF IP IF IF IF TP ie 1F 1P 1P IF IF IF IF LE 160 IF IF IF IF 1F TE IF 1F IF IP IF aF IF IF iF IE 170 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 180 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F 1F IP IF 1F 1F 190 LE 1F 1F 1F 1F IE 1F 1F 1F 1F IF 1F IF 1F 1F 1F 1A0 LEF LF LF Oe ee Bee ee IFL IF IF TE 1B0 1F 1F 1F 1F 1F 1F 1F 1F 1F 2D 2D 2D 2D 2D 2D 2D 1C0 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 1D0 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 1E0 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 1F0 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 200 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 210 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 220 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 230 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 240 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 250 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 260 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 270 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 280 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 2D 290 2D 2D 2D 2D 2D 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 3C 2A0 3C 3C 3C 3C 3C 3C 3C 3C BSE 3C 3C 3C 3 3 30 SE 2B0 3C 3C 3C 3C 3C 3C 3C 3C 3
50. MAC_LOG ADJUST RANGING OFFSET CMAC_LOG RANGING OFFSET SET TO CMAC_LOG ADJUST_TX POWER CMAC_LOG POWER LEVEL IS CMAC_LOG STATE CHANGE CMAC_LOG RNG REQ QUEUED CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG RSP MSG _RCVD CMAC_LOG ADJUST RANGING OFFSET CMAC_LOG RANGING OFFSET SET TO CMAC_LOG RANGING CONTINUE CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG RSP MSG RCVD CMAC_LOG ADJUST_TX POWER CMAC_LOG POWER LEVEL IS CMAC_LOG RANGING CONTINUE CMAC_LOG RNG REQ TRANSMITTED CMAC_LOG RNG RSP _MSG_RCVD CMAC_LOG RANGING SUCCESS CMAC_LOG STATE CHANGE CMAC_LOG DHCP ASSIGNED IP ADDRESS CMAC_LOG DHCP TFTP SERVER ADDRESS CMAC_LOG DHCP TOD SERVER ADDRESS CMAC_LOG DHCP SET GATEWAY ADDRESS CMAC_LOG DHCP TZ OFFSET CMAC_LOG DHCP CONFIG FILE NAME CMAC_LOG DHCP ERROR ACQUIRING SEC_SVR_ADDR CMAC_LOG DHCP COMPLETE CMAC_LOG STATE CHANGE CMAC_LOG TOD REQUEST SENT CMAC_LOG TOD REPLY RECEIVED CMAC_LOG TOD COMPLETE CMAC_LOG STATE CHANGE CMAC_LOG SECURITY BYPASSED CMAC_LOG STATE CHANGE CMAC_LOG LOADING CONFIG FILE CMAC_LOG CONFIG FILE PROCESS COMPLETE CMAC_LOG STATE CHANGE CMAC_LOG REG REQ MSG QUEUED CMAC_LOG REG REQ TRANSMITTED CMAC_LOG REG RSP MSG RCVD CMAC_LOG COS ASSIGNED SID CMAC_LOG COS ASSIGNED SID CMAC_LOG COS ASSIGNED SID 699000000 3 699000000 wait_ucd_state 3 20000000 8 1 wait_map_state 40 ranging_1_state 9610 28 0 dBmV comman
51. Note This message indicates that downstream frequencies were found but the Cisco uBR924 failed to acquire a downstream lock CMAC_LOG RESET T2_ EXPIRED Initial ranging opportunities are not being received CMAC LOG RESET T3_ RETRIES EXHAUSTED The CMTS failed too many times to respond to a RNG REQ message Note After 16 T3 timeouts the Cisco uBR924 will reset the cable interface CMAC LOG RESET RANGING ABORTED The CMTS commanded the Cisco uBR924 to abort the ranging process CMAC_LOG RESET NO MEMORY The Cisco uBR924 has run out of memory CMAC LOG RESET CANT START PROCESS The Cisco uBR924 was unable to start an internal process necessary to complete ranging and registration CMAC LOG RESET CONFIG FILE READ FAILED The reading of the configuration file from the TFTP server failed Note The file might not exist or it might have incorrect permissions CMAC_LOG RESET AUTHENTICATION FAILURE Cisco IOS Release 12 0 5 T The Cisco uBR924 failed authentication as indicated in a REG RSP message from the CMTS show controllers cable modem mac Table 6 Possible but Uncommon Cable Interface Reset Causes continued Message Description CMAC_LOG_RESET_SERVICE_NOT_AVAILABLE The CMTS has failed the Cisco uBR924 s registration because a required or requested class of service is not available CMAC_L
52. OG_RESET_T6_RETRIES EXHAUSTED The CMTS failed too many times to respond to a REG REQ message CMAC_LOG_RESET_MAINTENANCE WATCHDOG DRIVER The Cisco uBR924 MAC layer failed to detect a change in the interface driver CMAC_LOG RESET_NET ACCESS MISSING The Network Access parameter is missing from the DOCSIS configuration file CMAC_LOG_RESET_FAILED_WRITE_ACCESS CONTROL The Cisco uBR924 was unable to set the Write Access Control for an SNMP parameter as specified by the DOCSIS configuration file CMAC_LOG RESET DHCP FAILED The DHCP server did not respond with all the required values The required values are IP address network mask TFTP server IP address TOD server IP address DOCSIS configuration file name and time zone offset CMAC_LOG_RESET_CANT_START_DS_TUNER_PRCESS The Cisco uBR924 was unable to start the internal process used to manage the downstream tuner CMAC LOG RESET TOO MANY DS LOCKS LOST Downstream QAM FEC lock has been lost too many times CMAC_LOG_RESET_NO_SEND TO DS TUNER_PROCESS The Cisco uBR924 MAC layer process was unable to communicate with the downstream tuner management process CMAC_LOG RESET DS TUNER WATCHDOG The downstream tuner process failed to report its continuing operation for a long period of time CMAC_LOG_RESET_UNABLE_TO_SET MIB OBJECT The Cisco uBR924 was unable to set an SNMP parameter as specified by the DOCSIS configuration file CMAC_LOG_RESET_MIB_OBJECT_PROCESS WATCHDOG The internal MIB object took too lo
53. Step 4 Interpret the MAC Log File and Take Action The search table is arranged so that the first frequencies tried are above 450 MHz Because many CATV systems have been upgraded from 450 MHz to 750 MHz coaxial cable digital channels have a high chance of being assigned in the new spectrum The search table omits channels below 90 MHz and above 860 MHz since the DOCSIS specification does not mandate their coverage Some CATV systems use alternative frequency plans such as the IRC Incrementally Related Carrier plan and HRC Harmonically Related Carrier plan Cisco cable access routers support both of these plans Most of the IRC channel slots overlap the EIA plan Event 3 Obtain Upstream Parameters The Cisco uBR924 waits for an upstream channel descriptor UCD message from the headend CMTS The UCD provides transmission parameters for the upstream channel 508146 124 CMAC LOG STATE CHANGE wait_ucd_state 508147 554 CMAC_ LOG UCD MSG _RCVD 3 508147 558 CMAC_ LOG UCD NEW US FREQUENCY 20000000 508147 558 CMAC LOG SLOT SIZE CHANGED 8 508147 622 CMAC_ LOG FOUND US CHANNEL 1 508147 624 CMAC LOG STATE CHANGE 508148 058 CMAC LOG MAP MSG _RCVD 508148 060 CMAC LOG INITIAL RANGING MINISLOTS 40 wait_map_state Event 4 Start Ranging for Power Adjustments The ranging process adjusts the transmit power of the cable access router The Cisco uBR924 performs ranging in two stages ranging state 1 and ranging state 2 The cM
54. TS uBR924 show controllers cable modem 0 mac log 508144 340 CMAC LOG DRIVER INIT IDB RESET Ox08098FEA 508144 342 CMAC LOG LINK DOWN 508144 344 CMAC LOG LINK UP 508144 348 CMAC LOG STATE CHANGE ds_channel_ scanning state 508144 350 CMAC LOG WILL SEARCH DS FREQUENCY BAND 88 453000000 855000000 6000000 508144 354 CMAC LOG WILL SEARCH DS FREQUENCY BAND 89 93000000 105000000 6000000 508144 356 CMAC LOG WILL SEARCH DS FREQUENCY BAND 90 111250000 117250000 6000000 508144 360 CMAC LOG WILL SEARCH DS FREQUENCY BAND 91 231012500 327012500 6000000 508144 362 CMAC LOG WILL SEARCH DS FREQUENCY BAND 92 333015000 333015000 6000000 508144 366 CMAC LOG WILL SEARCH DS FREQUENCY BAND 93 339012500 399012500 6000000 508144 370 CMAC LOG WILL SEARCH DS FREQUENCY BAND 94 405000000 447000000 6000000 508144 372 CMAC LOG WILL SEARCH DS FREQUENCY BAND 95 123015000 129015000 6000000 508144 376 CMAC LOG WILL SEARCH DS FREQUENCY BAND 96 135012500 135012500 6000000 508144 380 CMAC LOG WILL SEARCH DS FREQUENCY BAND 97 141000000 171000000 6000000 508144 382 CMAC LOG WILL SEARCH DS FREQUENCY BAND 98 219000000 225000000 6000000 508144 386 CMAC LOG WILL SEARCH DS FREQUENCY BAND 99 177000000 213000000 6000000 Troubleshooting Tips for the Cisco UBR924 Cable Access Router 11 Step 3 Display the Cisco uBR924 s MAC Log File 12 508144 508145 508146 508147 508147 508147 508147 508147 5081
55. Troubleshooting Tips for the Cisco UBR924 Cable Access Router Feature Summary This document describes the Cisco IOS troubleshooting commands that may be used by cable service providers to verify communication between a Cisco uBR9724 cable access router and other peripheral devices installed in the HFC headend such as a Cisco uBR7200 series universal broadband router a DHCP server and a TFTP server Benefits The Cisco uBR924 cable access router troubleshooting system provides the following benefits AMAC layer system log file that provides a snapshot of detailed reasons why an interface might reset along with all the negotiations that occurred between the Cisco uBR924 cable access router and the CMTS Over 220 possible description fields exist in this log which is displayed using the show controllers cable modem 0 mac log command from privileged EXEC mode Debug does not need to be turned on in order to troubleshoot a Cisco uBR924 cable access router The progression of normal data over cable communication events is clearly explained simplifying the resolution of faulty system connections Troubleshooting and diagnostic tasks can be performed on the Cisco uBR924 from a remote location using TELNET Restrictions When using the Cisco uBR924 cable access router keep the following restrictions and limitations in mind The Cisco uBR9724 is able to implement multiple classes of service CoS on the cable interface however sep
56. Y BAN REQUENCY BAN REQUENCY BAN REQUENCY BAN REQUENCY BAN REQUENCY BAN 528308 488 CMAC 1 SEA RCH USE 528310 292 CMAC LOG STATE CHANGE LOG REG REQ MSG QUEUED CMAC CMAC LOG_REG_REQ_TRANSMITTED LOG REG RSP MSG RCVD CMAC CMAC CMAC CMAC CMAC CMAC CMAC LOG COS ASSIGNED SID LOG RNG REQ QUEUED LOG REGISTRATION OK LOG STATE CHANGE LOG STATE CHANGE LOG RNG REQ TRANSMITTED LOG RNG RSP MSG RCVD CMAC_ CMAC LOG RNG REQ TRANSMITTED RNG RSP MSG RCVD CMAC CMAC LOG LOG RNG REQ TRANSMITTED RNG RSP MSG RCVD CMAC CMAC CMAC CMAC CMAC CMAC CMAC CMAC CMAC CMAC CMAC CMAC CMAC CMAC CMAC CMAC LOG WATCHDOG TIMER LOG RNG RSP MSG RCVD RNG REQ TRANSMITTED LOG RNG REQ TRANSMITTED LOG RNG RSP MSG RCVD LOG LINK DOWN LOG RESET FROM DRIVER LOG DRIVER INIT IDB SHUTDOWN LINK DOWN LOG WATCHDOG TIMER LOG WATCHDOG TIMER LOG LOG RNG REQ TRANSMITTED LOG RNG RSP MSG RCVD LOG LOG WATCHDOG TIMER LOG STATE CHANGE LOG LOG WATCHDOG TIMER Cisco IOS Release 12 0 5 T registration_state 1 4 4 UUUUVUVMVUVM Vee veo D D DS FREQUENCY R DS FREQUENCY 64QAM LOCK ACQUIRED wait_for_link_up_state 0x08098D02 0x08098E5E ds_channel_ scanning state 88 453000000 855000000 6000000 89 93000000 105000000 6000000 90 111250000 117250000 6000000 91 2
57. ak 0x8324590 pak 0x8323FA8 pak 0x8326EE8 pak 0x8328E68 pak 0x8327AB8 pak 0x8328880 pak 0x8326CF0 1E88 1 buf 0x224F1A buf 0x21EC72 buf 0x21D74E buf 0x22806E buf 0x22F12E buf 0x22AAB6 buf 0x22DC0A buf 0x227962 rx_ p mac 0x83 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0xA0 1BE80 pa pa pa pa pa pa pa pa 1 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 0 TX BD ring with 8 entries at 0x201FB8 tx_count tx_head Ox201FD8 4 head_txp 0x831BF20 tx_tail Ox201FD8 4 tail_txp 0x831BF20 4 4 00 01 02 03 04 05 06 07 TX PD ring with 8 entries at 0x202038 tx_head_pd tx_tail_pd pak 0x000000 pak 0x000000 pak 0x000000 pak 0x000000 pak 0x000000 pak 0x000000 pak 0x000000 pak 0x000000 0x202 0x202 buf 0x200000 buf 0x200000 buf 0x200000 buf 0x200000 buf 0x200000 buf 0x200000 buf 0x200000 buf 0x200000 838 838 4 4 status 0x00 status 0x00 status 0x00 status 0x00 status 0x00 status 0x00 status 0x00 status 0x20 tx_count pak_size 0 pa pa pa pa pa pa pa k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 0 00 status 0x00 bd_index 0x0000 len 0x0000 hdr_len 0x0000 Troubleshooting Tips for the Cisco uBR924 Cable Access Router 21 show controllers cable modem ehdr 01 06 02 74 34 11 01 status 0x00 bd_index 0x0001 len 0x0000 hdr_len 0x0000
58. arate CoS streams are only available when the cable access router is connected to a headend that supports multiple CoS per cable access router In addition the configuration file downloaded to the cable access router must specify the use of multiple classes of service If the Cisco uBR924 cable access router is connected to a DOCSIS 1 0 headend that does not support multiple CoS per cable access router voice and data will be mixed and voice traffic will be transmitted on a best effort basis This may cause poorer voice quality and lower data throughput when calls are being made from the cable access router s telephone ports Voice quality may also be affected when transmitting or downloading large files or at other times when network traffic is heavy Troubleshooting Tips for the Cisco uUBR924 Cable Access Router 1 Related Features and Technologies Note The Cisco uBR924 cable access router is typically configured at the headend Most cable service operators do not permit local configuration at subscriber sites A Caution Before attempting to reconfigure a Cisco uBR924 cable access router at a subscriber site contact your network management provisioning manager or billing system administrator to ensure remote configuration is allowed If remote configuration is disabled settings you make and save at the local site will not remain in effect after the cable access router is reset or powered off and back on Instead settings will
59. ast Codeword Length 1 Scrambler on off 1 Burst Descriptor 2 Interval Usage Code 4 Modulation Type 1 Differential Encoding 2 Preamble Length 128 Preamble Value Offset 0 FEC Error Correction 5 FEC Codeword Info Bytes 34 Scrambler Seed 338 Maximum Burst Size o Guard Time Size 48 Last Codeword Length I Scrambler on off 1 Burst Descriptor 3 Interval Usage Code 5 Modulation Type 1 Differential Encoding 2 Preamble Length 72 Preamble Value Offset 48 FEC Error Correction 5 FEC Codeword Info Bytes 75 Scrambler Seed 338 Maximum Burst Size 0 Guard Time Size 8 Last Codeword Length T Scrambler on off I Config File Network Access TRUE Vendor ID 0 240 30 Baseline Privacy Auth Wait Timeout 10 Reauth Wait Timeout 10 Auth Grace Time 600 Op Wait Timeout 1 Retry Wait Timeout 1 TEK Grace Time 600 Auth Reject Wait Time 60 48 Cisco IOS Release 12 0 5 T show controllers cable modem mac Cos 1 Assigned SID Max Downstream Rate Max Upstream Rate Upstream Priority Min Upstream Rate Max Upstream Burst Privacy Enable Ranging Backoff Start Ranging Backoff End Data Backoff Start Data Backoff End IP Address Net Mask TFTP Server IP Address Time Server IP Address Config File Name Time Zone Offset 5 4000000 2000000 7 100000 at initial ranging at initial ranging at initial ranging at initial ranging 223 255 254 254 188 188 1 5 muck ebuell tftp
60. ays information about the baseline privacy key management exchange between the Cisco uBR924 and the CMTS show controllers cable modem des Displays information about the Data Encryption Standard DES engine registers show controllers cable modem Displays the mini slot lookup table inside a Cisco uBR924 lookup table show controllers cable modem mac Displays detailed MAC layer information for a Cisco uBR924 show controllers cable modem phy Displays the contents of the registers used in the downstream physical hardware of the Cisco uBR924 show controllers cable modem tuner Displays the settings for the upstream and downstream tuners used by a Cisco uBR924 Troubleshooting Tips for the Cisco uBR924 Cable Access Router 33 show controllers cable modem lookup table show controllers cable modem lookup table To display the mini slot lookup table inside a Cisco uBR924 use the show controllers cable modem lookup table command in privileged EXEC mode show controllers cable modem number lookup table Syntax Description number Controller number inside the Cisco uBR924 Defaults No default behavior or values Command Modes Privileged EXEC Command History Release Modification 11 3 NA This command was first introduced Usage Guidelines This command displays the details of the lookup table The driver uses this table to convert the size of the packets that the Cisco uBR924 wants to transmit into a ba
61. chronize Different geographical regions and different cable plants use different frequency bands The Cisco uBR924 cable access router uses a built in default frequency scanning feature to address this issue After the Cisco uBR924 finds a successful downstream frequency channel it saves the channel to NVRAM The Cisco uBR9724 recalls this value the next time it needs to synchronize its frequency The cMAC_LOG WILL SEARCH _DS_ FREQUENCY BAND field tells you what frequency the Cisco uBR924 will scan for The cMAC_LOG _WILL_SEARCH_SAVED_DS_ FREQUENCY field tells you the frequency the Cisco uBR924 locked onto and saved to NVRAM for future recall The CMAC LOG DS 64QAM LOCK ACQUIRED field communicates the same information The CMAC_LOG DS CHANNEL SCAN COMPLETED field indicates that the scanning and synchronization was successful 508144 348 CMAC LOG STATE CHANGE ds_channel_ scanning state 508144 350 CMAC LOG WILL SEARCH DS FREQUENCY BAND 88 453000000 855000000 6000000 508144 354 CMAC LOG WILL SEARCH DS FREQUENCY BAND 89 93000000 105000000 6000000 508144 356 CMAC LOG WILL SEARCH DS FREQUENCY BAND 90 111250000 117250000 6000000 508144 360 CMAC LOG WILL SEARCH DS FREQUENCY BAND 91 231012500 327012500 6000000 508144 362 CMAC LOG WILL SEARCH DS FREQUENCY BAND 92 333015000 333015000 6000000 508144 366 CMAC LOG WILL SEARCH DS FREQUENCY BAND 93 339012500 399
62. cm_conf 28800 Table 8 describes the fields shown in the display Table 8 Show Controllers Cable Modem MAC State Field Descriptions Field Description MAC State Current operational state of the MAC layer of the Cisco uBR924 Ranging SID Service ID used for ranging requests Registered Indicates whether or not the Cisco uBR924 is currently registered with the CMTS Privacy Established Indicates whether or not keys for baseline privacy have been exchanged between the Cisco uBR924 and the CMTS establishing privacy Mac Resets Number of times the Cisco uBR924 reset or initialized this interface Sync lost Number of times the Cisco uBR924 lost synchronization with the downstream channel Invalid Maps Number of times the Cisco uBR924 received invalid MAP messages Invalid UCDs Number of times the Cisco uBR924 received invalid UCD messages Invalid Rng Rsp Number of times the Cisco uBR924 received invalid ranging response messages Invalid Reg Rsp Number of times the Cisco uBR924 received invalid registration response messages T1 Timeouts Number of timeouts caused by the Cisco uBR924 not receiving a valid upstream channel descriptor UCD from the CMTS within the specified time T2 Timeouts Number of timeouts caused by the Cisco uBR924 not receiving a maintenance broadcast for ranging opportunities from the CMTS within a specified time T3 Timeouts Number of timeouts caused by the Cisco uBR924
63. configuration file that is downloaded to the cable access router Baseline privacy code images for the Cisco uBR924 contain k1 in the code image name Examples The following output is displayed when the headend CMTS does not have baseline privacy enabled uBR924 show controllers cable modem 0 bpkm CM Baseline Privacy Key Management configuration in seconds authorization wait time 10 reauthorization wait time 10 authorization grace time 600 operational wait time q rekey wait time 1 tek grace time 600 authorization rej wait time 60 kek state STATE B AUTH WAIT sid 4 tek state No resources assigned 26 Cisco IOS Release 12 0 5 T show controllers cable modem bpkm Table 3 describes the fields shown in the display Table 3 Show Controllers Cable Modem bpkm Field Descriptions Field Description authorization wait time The number of seconds the Cisco uBR924 waits for a reply after sending the Authorization Request message to the CMTS reauthorization wait time The number of seconds the Cisco uBR924 waits for a reply after it has sent an Authorization Request message to the CMTS in response to a reauthorization request or an Authorization Invalid message from the CMTS authorization grace time The number of seconds before the current authorization is set to expire that the grace timer begins signaling the Cisco uBR9724 to begin the reauthorization process operational wait time The numb
64. d by entering the show controllers cable modem 0 mac log command from privileged EXEC mode The most useful display fields in this log file are the reported state changes These fields are preceded by the message cmac_LOG STATE CHANGE These fields show how the Cisco uBR924 progresses through the various processes involved in establishing communication and registration with the CMTS The maintenance_state is the normal operational state the wait_for_link up state is the normal state when the interface is shut down Note Because the MAC log file only holds a snapshot of 1023 entries at a time you should try to display the Cisco uBR924 s log file within 5 minutes after the reset or problem occurs The following is the normal progression of states as displayed by the MAC log wait_for_link_up_state ds_channel_ scanning state wait_ucd_state wait_map_ state ranging 1 state ranging 2 state dhcp _state establish _tod_state security _association_state configuration file state registration_state establish privacy state maintenance state Note To translate this output into more meaningful information see Step 4 Interpret the MAC Log File and Take Action on page 13 Following is an example of what the MAC log file looks like when the Cisco uBR924 interface successfully comes up and registers with the CMTS The output you see is directly related to the messages that are exchanged between the Cisco uBR924 and the headend CM
65. ded 0 0 2 2408 12018 20 33 0 dBmV commanded ranging 2 state 2 64 11954 9 31 0 dBmV commanded dhcp_state 188 188 1 62 4 0 0 1 4 0 0 32 360 platinum cm establish _tod_state 3107617539 security _association_state configuration file state platinum cm registration_state 5 19 6 20 7 21 Step 4 Interpret the MAC Log File and Take Action 508178 508178 508178 508178 508178 508178 318 320 322 324 326 328 CMAC_LOG RNG REQ QUEUED 19 CMAC_LOG REGISTRATION OK CMAC_LOG REG RSP ACK MSG QUEUED 0 CMAC_LOG STATE CHANGE establish privacy state CMAC_LOG NO PRIVACY CMAC_LOG STATE CHANGE maintenance state You can display other aspects of the MAC layer by using variations of the show controllers cable modem 0 mac command uBR924 show controllers cable modem 0 mac Mac Error Log data error s hardware log reset state s All CM Mac Hardware registers Mac log data Resets of the MAC Current MAC state For examples and descriptions of how to use these keywords see the show controllers cable modem mac command reference page Step 4 Interpret the MAC Log File and Take Action The MAC log file gives a detailed history of initialization events that occurred in the Cisco uBR924 All pertinent troubleshooting information is stored here The following sample log file is broken down into the chronological sequence of events listed below Sample comments are als
66. dem interrupts command in privileged EXEC mode To turn the debugging messages off use the no form of this command no debug cable modem interrupts Syntax Description This command has no keywords or arguments Defaults No default behavior or values Command Modes Privileged EXEC Command History Release Modification 11 3 NA This command was first introduced Examples The following example shows sample debug output for Cisco uBR924 interrupts uBR924 debug cable modem interrupts BCM3300_rx mac_msg_interrupt BCM3300_rx mac_msg_interrupt BCM3300_tx_interrupt BCM3300 rx _mac_msg_interrupt BCM3300 tx_interrupt BCM3300 rx_mac_msg_interrupt BCM3300 tx_interrupt BCM3300 tx_interrupt BCM3300 tx_interrupt BCM3300 tx_interrupt Troubleshooting Tips for the Cisco UBR924 Cable Access Router 65 debug cable modem interrupts Related Commands 66 Command Description debug cable modem bpkm Debugs baseline privacy information on a Cisco uBR924 debug cable modem bridge Debugs bridge filter processing information on a Cisco uBR924 debug cable modem error Enables debugging messages for the cable interface driver on a Cisco uBR924 debug cable modem mac Troubleshoots the Cisco uBR924 MAC layer debug cable modem map Displays the timing from MAP messages to sync messages and the timing b
67. dem0 changed state to downshut m_tbridge_add_entry MAC not initialized discarding entry 00e0 fe7a 186fno shut m_tbridge_add_entry MAC not initialized discarding entry 00e0 fe7a 186f LINEPROTO 5 UPDOWN Line protocol on Interface cable modem0 changed state to up cm_tbridge add_entry Adding entry 00e0 fe7a 186f to filter 2 ole OO ole Troubleshooting Tips for the Cisco UBR924 Cable Access Router 61 debug cable modem bridge Related Commands 62 Command Description debug cable modem bpkm Debugs baseline privacy information on a Cisco uBR924 debug cable modem error Enables debugging messages for the cable interface driver on a Cisco uBR924 debug cable modem interrupts Debugs Cisco uBR924 interrupts debug cable modem mac Troubleshoots the Cisco uBR924 MAC layer debug cable modem map Displays the timing from MAP messages to sync messages and the timing between MAP messages Cisco IOS Release 12 0 5 T debug cable modem error debug cable modem error Use the the debug cable modem error command in privileged EXEC mode to enable debugging messages for the cable interface driver To turn the debugging messages off use the no form of this command no debug cable modem error Syntax Description This command has no keywords or arguments Defaults No default behavior or values Command Modes Privileged EXEC Command History Release Modifica
68. e beginning of buffer information for the transmit buffer descriptor ring tx_count If tx_count is 0 or if tx_head and tx_tail are equal and there is no change for a period of tx head time it means there are packets stuck on the ring This condition may be caused by the headend not giving grants head_txp The next packet descriptor to get used along with its index tx_tail tail_txp The next packet descriptor to get sent along with its index When head_txp and tail_txp are the same the transmit queue is empty Troubleshooting Tips for the Cisco uBR924 Cable Access Router 23 show controllers cable modem 24 Table 2 Show Controllers Cable Modem Field Descriptions continued Field Description TX PD ring Indicates the memory location of the beginning of buffer information for the transmit packet descriptor ring tx_head_pd Indicates current head packet descriptor tx_tail_pd Indicates current tail packet descriptor ehdr Extended MCNS header MIB Statistics DS fifo full Number of times the downstream input first in first out FIFO buffer became full on the Cisco uBR924 rerequests Number of times a bandwidth request generated by the Cisco uBR924 was not responded to by the CMTS DS mac msg overruns Number of times the Cisco uBR924 s DMA controller had a downstream MAC message and there were no free MAC message buffer descriptors to accept the message DS data overruns Number of times the
69. e met The Cisco uBR7200 series universal broadband router or other DOCSIS based CMTS must be installed at the cable headend and configured Refer to the Cisco uBR7246 Installation and Configuration Guide or the Cisco uBR7223 Installation and Configuration Guide for detailed information The Cisco uBR924 cable access router must be physically installed and cabled as follows To the headend via CATV coaxial cable To at least one PC via the straight through yellow Ethernet cable supplied with the cable access router Refer to the Cisco uBR924 Cable Access Router Quick Start Guide for detailed information The PC s connected to the Cisco uBR924 cable access router must be configured for Internet Protocol IP The cable service provider must have a correctly configured network DHCP server and Electronic Industries Association EIA downstream channel Cisco IOS Release 11 3 4 NA or later must be running on the Cisco uBR924 cable access router When the cable access router is up and running you can display the IOS release number by entering the show version command from user EXEC mode Note Ifthe Cisco uBR7246 universal broadband router at the cable headend is using MC16 modem cards Cisco IOS Release 11 3 7 NA or later must be running on the Cisco uBR924 cable access router In order to use the Cisco uBR9724 cable access router for VoIP over cable applications the following additional conditions must be met
70. e the saved downstream channel the next time a request is made Note An ideal downstream signal is one that synchronizes QAM symbol timing FEC framing MPEG packetization and recognizes downstream sync MAC layer messages Obtain upsteam channel parameters The Cisco uBR924 waits for an upstream channel descriptor UCD message from the CMTS The UCD provides transmission parameters for the upstream channel Start ranging for power adjustments The ranging process adjusts the Cisco uBR924 s transmit power Ranging is performed in two stages ranging state 1 and ranging state 2 Establish IP connectivity The Cisco uBR924 sends a DHCP request to obtain an IP address which is needed for IP connectivity The DHCP response also includes the name of a file that contains additional configuration parameters the TFTP server s address and the Time of Day TOD server s address Establish the time of day The Cisco uBR924 accesses the TOD server for the current date and time which is used to create time stamps for logged events such as those displayed in the MAC log file Establish security Keys for privacy are exchanged between the Cisco uBR924 and the CMTS Note The Cisco uBR924 cable access router supports baseline privacy in Cisco IOS Release 12 0 5 T and later Transfer operational parameters After the DHCP and security operations are successful the Cisco uBR924 downloads operational parame
71. e to troubleshoot a Cisco uBR924 cable access router debug cable modem bpkm debug cable modem bridge debug cable modem error debug cable modem interrupts debug cable modem mac debug cable modem map Note Troubleshooting the Cisco uBR924 cable access router is typically accomplished using the CMTS at the cable operator s headend facility it is rarely done by directly accessing the Cisco uBR924 For information on troubleshooting the Cisco uBR924 using Cisco uBR7200 series universal broadband routers see the document Cisco uBR7246 Universal Broadband Router Features Also see the Related Documents section on page 2 for additional documents relating to troubleshooting 58 Cisco IOS Release 12 0 5 T debug cable modem bpkm debug cable modem bpkm To debug baseline privacy information on a Cisco uBR924 use the debug cable modem bpkm command in privileged EXEC mode To turn the debugging messages off use the no form of this command no debug cable modem bpkm errors events packets Syntax Description errors Debugs Cisco uBR924 privacy errors events Debugs events related to cable baseline privacy packets Debugs baseline privacy packets Defaults No default behavior or values Command Modes Privileged EXEC Command History Release Modification 11 3 NA This command was first introduced Usage Guidelines Baseline privacy key management exchanges take place only when both
72. ead The file might not exist or the file might have incorrect permissions uBR924 show controllers cable modem 0 mac resets 62526 114 CMAC LOG RESET CONFIG FILE READ FAILED 62564 368 CMAC LOG RESET T4 EXPIRED 62677 178 CMAC LOG RESET CONFIG FILE READ FAILED 62717 462 CMAC LOG RESET CONFIG FILE READ FAILE 62757 746 CMAC LOG RESET CONFIG FILE READ FAILE 62796 000 CMAC LOG RESET T4 EXPIRED 0 o 62908 808 CMAC LOG RESET CONFIG FILE READ FAILED 62949 092 CMAC LOG RESET CONFIG FILE READ FAILED 62989 380 CMAC LOG RESET CONFIG FILE READ FAILED 63029 662 CMAC LOG RESET CONFIG FILE READ FAILED 63069 944 CMAC LOG RESET CONFIG FILE READ FAILED 63110 228 CMAC LOG RESET CONFIG FILE READ FAILED 63148 484 CMAC LOG RESET T4 EXPIRED 63261 296 CMAC LOG RESET CONFIG FILE READ FAILED The following example shows that the DHCP server could not be reached or that it took too long to respond uBR924 show controllers cable modem 0 mac resets 497989 804 CMAC LOG RESET DHCP WATCHDOG EXPIRED 498024 046 CMAC LOG RESET DHCP WATCHDOG EXPIRED 498058 284 CMAC LOG RESET DHCP WATCHDOG EXPIRED Troubleshooting Tips for the Cisco UBR924 Cable Access Router 41 show controllers cable modem mac 42 The following example indicates that an event in the cable interface driver caused the interface to reset This often occurs because a shut or clear command is currently being issued on the
73. el Max Upstream Burst Maximum transmit burst in bytes allowed for this service class on the upstream channel Privacy Enable Indicates whether or not Baseline Privacy is enabled for this service class Ranging Backoff Start Initial back off window for initial ranging contention expressed as a power of 2 Valid values are from 0 to 15 Troubleshooting Tips for the Cisco UBR924 Cable Access Router 51 show controllers cable modem mac Table 8 Show Controllers Cable Modem MAC State Field Descriptions continued Field Description Ranging Backoff End Final back off window for initial ranging contention expressed as a power of 2 Valid values are from 0 to 15 Data Backoff Start Initial back off window for contention data and requests expressed as a power of 2 Valid values are from 0 to 15 Data Backoff End Final back off window for contention data and requests expressed as a power of 2 Valid values are from 0 to 15 IP Address IP address of the cable interface Net Mask Subnet mask of the cable interface TFTP Server IP Address IP address of the CMTS TFTP server Time Server IP Address IP address of the CMTS Time of Day TOD server Config File Name Name of the configuration file that is downloaded from the TFTP server to provide the Cisco uBR924 with operational parameters Time Zone Offset Correction received from the DHCP server to synchronize the Cisco uBR924 time clock
74. ept versions 0 to 15 Troubleshooting Tips for the Cisco UBR924 Cable Access Router 29 show controllers cable modem des Table 4 Show Controllers Cable Modem DES Field Descriptions continued Field Description ds_unencrypted_length Specifies the number of bytes that will be unencrypted at the beginning of the MAC frame 0x0C means the first 12 bytes are not encrypted which is what the DOCSIS Baseline Privacy specification calls for us_des_key_table Table showing upstream DES keys us_des_cbc_iv_table Table of upstream DES Cipher Block Chaining mode information us_des_ctrl Control register that controls the operating mode of the upstream DES engine The value 0x24 means that the upstream is configured to enable decryption and to use CBC mode Related Commands 30 Command Description show controllers cable modem Displays high level controller information about a Cisco uBR924 cable access router show controllers cable modem bpkm Displays information about the baseline privacy key management exchange between the Cisco uBR924 and the CMTS show controllers cable modem filters Displays the registers in the MAC hardware that are used for filtering received frames show controllers cable modem lookup table Displays the mini slot lookup table inside a Cisco uBR924 show controllers cable modem mac Displays detailed MAC layer information for a Cisco uBR924 show c
75. er of seconds the TEK state machine waits for a reply from the CMTS after sending its initial Key Request for its SID s keying material rekey wait time The number of seconds the TEK state machine waits for a replacement key for this SID after the TEK grace timer has expired and the request for a replacement key has been made tek grace time The number of seconds before the current TEK is set to expire that the TEK grace timer begins signaling the TEK state machine to request a replacement key authorization rej wait time Number of seconds the Cisco uBR924 waits before sending another Authorization Request message to the CMTS after it has received an Authorization Reject message kek state The current state of the key encryption key that the CMTS uses to encrypt the traffic encryption keys it sends to the Cisco uBR924 tek state The current state of the traffic encryption key state machine for the specified SID Related Commands Command Description show controllers cable modem Displays high level controller information about a Cisco uBR924 cable access router show controllers cable modem des Displays information about the Data Encryption Standard DES engine registers show controllers cable modem filters Displays the registers in the MAC hardware that are used for filtering received frames show controllers cable modem Displays the mini slot lookup table inside a Cisco uBR924 lookup
76. essage power_level Transmit power level as set in the hardware given as a hexadecimal value The units are unique to the hardware used Use the show controllers cable modem 0 mac state command to see the power level in dBmV symbol_rate Indicates the upstream symbol rate in symbols per second that is negotiated between the CMTS and the cable access router Related Commands Command Description show controllers cable modem Displays high level controller information about a Cisco uBR924 cable access router show controllers cable emodem bpkm Displays information about the baseline privacy key management exchange between the Cisco uBR924 and the CMTS show controllers cable modem des Displays information about the Data Encryption Standard DES engine registers show controllers cable modem filters Displays the registers in the MAC hardware that are used for filtering received frames show controllers cable modem lookup table Displays the mini slot lookup table inside a Cisco uBR924 show controllers cable modem mac Displays detailed MAC layer information for a Cisco uBR924 show controllers cable modem phy Displays the contents of the registers used in the downstream physical hardware of the Cisco uBR924 Troubleshooting Tips for the Cisco UBR924 Cable Access Router 57 show controllers cable modem tuner Debug Commands The following debug commands are availabl
77. etween MAP messages Cisco IOS Release 12 0 5 T debug cable modem mac debug cable modem mac To troubleshoot the Cisco uBR924 MAC layer use the debug cable modem mac command in privileged EXEC mode To turn the debugging messages off use the no form of this command no debug cable modem mac log verbose messages Syntax Description log Realtime MAC log display verbose Optional Displays periodic MAC layer events such as ranging messages MAC layer management messages Defaults No default behavior or values Command Modes Privileged EXEC Command History Release Modification 11 3 NA This command was first introduced Usage Guidelines Of all the available debug cable modem commands the most useful is debug cable modem mac log MAC log messages are written to a circular log file even when debugging is not turned on These messages include timestamps events and information pertinent to these events Enter the debug cable modem mac log command to view MAC log messages If you want to view this information without entering debug mode enter the show controllers cable modem number mac log command The same information is displayed by both commands If the Cisco uBR924 interface fails to come up or resets periodically the MAC log will show what happened For example if an address is not obtained from the DHCP server an error is logged initialization starts over and the Cisco uBR924 scans for a dow
78. hdrs Number of valid MAC headers received by the cable interface Below the MIB statistics in the show controllers cable modem 0 mac hardware display the BCM3300 registers section shows the DMA locations of the indicated processing routines of the Broadcom 3220 MAC chip within the Cisco uBR924 Cisco IOS Release 12 0 5 T show controllers cable modem mac Example 5 The show controllers cable modem mac state command summarizes the state of the cable MAC layer and provides a list of downstream search frequency bands and the order in which they are searched If the cable MAC layer is in the wait _for link up state the information shown in the display corresponds to the last time the interface was up This allows useful information to be acquired from this display even though the modem has not been able to range and register The normal operational state of the interface is the maintenance_state uBR924 show controller cable modem 0 mac state MAC State maintenance state Ranging SID 5 Registered TRUE Privacy Established TRUE MIB Values Mac Resets 0 Sync lost 0 Invalid Maps 0 Invalid UCDs 0 Invalid Rng Rsp 0 Invalid Reg Rsp 0 1 Timeouts 0 2 Timeouts 0 3 Timeouts 4 T4 Timeouts o Range Aborts 0 DS ID 1 DS Frequency 663000000 DS Symbol Rate 5056941 DS QAM Mode 640AM DS Search 88 453000000 855000000 6000000 89 93000000 105000000 6000000 90 111250000 117250000 6000000 91 231012500 327012500
79. ing interoperable cable access routers MSO Multiple System Operator A cable service provider that operates in more than one geographic area thus having multiple headend facilities narrowband A single RF frequency NTSC National Television Systems Committee A United States TV technical standard named after the organization that created the standard in 1941 Specifies a 6 MHz wide modulated signal PAL Phase Alternating Line The TV system used in most of Europe in which the color carrier phase definition changes in alternate scan lines Utilizes an 8 MHz wide modulated signal QAM Quadrature Amplitude Modulation A method of modulating digital signals onto a radio frequency carrier signal in which the value of a symbol consisting of multiple bits is represented by amplitude and phase states of the carrier QAM is a modulation scheme mostly used in the downstream direction 64 QAM 256 QAM 16 QAM is expected to be usable in the upstream direction Numbers indicate number of code points per symbol The QAM rate or the number of points in the QAM constellation can be computed by 2 raised to the power of lt number of bits symbol gt For example 16 QAM has 4 bits per symbol 64 QAM has 6 bits per symbol and 256 QAM has 8 bits per symbol QPSK Quadrature Phase Shift Keying A digital modulation method in which there are 2 data bits represented with each baud symbol ranging tThe process of acquiring the correct timing offset
80. ket ID mac_msg_proto_ver Version of the MAC management protocol in use reg_rang_req_sid Service ID SID field of the ranging request message ds_data_da_filter_table Downstream data processing filter table ds_data_da_filter_ctrl Downstream data processing filter control ds_pdu_sof Downstream PDU start of frame ds_data_da_mc Downstream data processing MAC control us_ctrl_status Upstream control status Cisco IOS Release 12 0 5 T show controllers cable modem filters Table 5 Show Controllers Cable Modem Filters Field Descriptions continued Field Description Minislots per request Length of each registration request in mini slots burst_maps Maps the burst profiles saved in the BCM3037 registers to interval usage codes AUCs bytes_per_minislot_exp Number of bytes per expansion mini slot ticks_per_minislot Number of time ticks 6 25 microsecond intervals in each upstream mini slot maint_xmit Number of initial maintenance transmit opportunities us_sid_table Upstream service ID table max_re_req Maximum number of registration re requests allowed rang_fifo Number of ranging requests that can be held in the first in first out FIFO buffer Related Commands Command Description show controllers cable modem Displays high level controller information about a Cisco uBR924 cable access router show controllers cable modem bpkm Displ
81. l regaddr Indicates the start of the BCM3300 registers reset_mask Indicates the bit to hit when resetting the chip station address MAC address of this Cisco uBR924 cable access router interface default station address Default MAC address assigned by the factory for this Cisco uBR924 cable access router PLD VERSION PLD version of the BCM3300 chip MAC state Current MAC state of the Cisco uBR924 Prev States Number of states that have previously existed since initialization MAC mcfilter MAC control filter for MAC messages 22 Cisco IOS Release 12 0 5 T show controllers cable modem Table 2 Show Controllers Cable Modem Field Descriptions continued Field Description data mcfilter MAC control filter for data DS Downstream Broadcom receiver chip number and ID US Upstream Broadcom transmitter chip number and ID Tuner status Current status of the tuner Rx tuner_freq Downstream frequency in Hz that the Cisco uBR924 searched for and found symbol_rate Downstream frequency in symbols per second local_freq Frequency on which the transmitter and the tuner communicate snr_estimate Estimate of signal to noise ratio SNR in Db X 1000 ber_estimate Estimate of bit error rate always 0 lock_threshold Minimum signal to noise ratio SNR that the Cisco uBR924 will accept as a valid lock qam_mode The modulation
82. lue Offset 7 01 44 06 FEC Error Correction 7 01 44 06 FEC Codeword Info Bytes 7 01 44 06 Scrambler Seed 7 01 44 06 Maximum Burst Size 7 01 44 06 Guard Time Size 7 01 44 06 Last Codeword Length 7 01 44 06 Scrambler on off 7 01 44 06 Burst Descriptor 1 7 01 44 06 Interval Usage Code ad 7 01 44 06 Modulation Type 7 01 44 06 Differential Encoding 7 01 44 06 Preamble Length 7 01 44 06 Preamble Value Offset 7 01 44 06 FEC Error Correction 7 01 44 06 FEC Codeword Info Bytes 7 01 44 06 Scrambler Seed me 7 01 44 06 Maximum Burst Size 7 01 44 06 Guard Time Size z 7 01 44 06 Last Codeword Length 7 01 44 06 Scrambler on off 7 01 44 06 Burst Descriptor 2 7 01 44 06 Interval Usage Code 7 01 44 06 Modulation Type 7 01 44 06 Differential Encoding 7 01 44 06 Preamble Length 0xC2 MAC Management 0x00 0xD3 01E0 2F00 0001 00EO0 1EA5 BB60 C1 03 01 02 UCD How 8 20000000 CECO CC Ce Ce CC Ce ie CC CC CC CC CC CC 0D 0D 1 1 QPSK 2 OFF 64 56 0 16 0x0152 8 1 FIXED 1 ON 3 1 QPSK 2 OFF 128 0 5 34 0x0152 0 48 1 FIXED 1 ON 4 1 QPSK 2 OFF 128 debug cable modem mac Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar
83. mmanded 2 2408 12018 20 33 0 dBmV commanded ranging 2 state 2 64 11954 9 31 0 dBmV commanded Troubleshooting Tips for the Cisco UBR924 Cable Access Router 15 Step 4 Interpret the MAC Log File and Take Action 16 Event 5 Establish IP Connectivity After ranging is complete the cable interface on the cable access router is UP Now the Cisco uBR924 accesses a remote DHCP server to get an IP address The DHCP request also includes the name of a file that contains additional configuration parameters the TFTP server s address and the Time of Day TOD server s address The cMAC_LOG DHCP ASSIGNED IP ADDRESS field indicates the IP address assigned from the DHCP server to the Cisco uBR9724 interface The cMAcC_LOG_DHCP_TFTP_SERVER_ ADDRESS field marks the TFTP server s address The cMac_LOG_DHCP_TOD_SERVER_ADDRESS field indicates the time of day server s address The cMAC_LOG DHCP CONFIG FILE NAME field shows the filename containing the transmission parameters The CMAC LOG DHCP COMPLETE field shows that the IP connectivity was successful 508175 968 CMAC LOG STATE CHANGE dhcp state 508176 982 CMAC_ LOG DHCP ASSIGNED IP ADDRESS 188 188 1 62 508176 984 CMAC LOG DHCP TFTP SERVER ADDRESS 4 0 0 1 508176 986 CMAC_ LOG DHCP TOD SERVER _ADDRESS 4 0 0 32 508176 988 CMAC_ LOG DHCP SET GATEWAY ADDRESS 508176 988 CMAC_ LOG DHCP TZ OFFSET 360 508176 990 CMAC_ LOG DHCP CONFIG FILE NAME
84. ndwidth request to the CMTS in mini slots The contents of this table are affected by the upstream symbol rate that is negotiated between the CMTS and the cable access router Use this table to look up the packet size and determine how many mini slots will be needed 34 Cisco IOS Release 12 0 5 T show controllers cable modem lookup table Examples The mini slot lookup table is displayed in the following example uBR924 show controllers cable modem 0 lookup table Max Burst Size minislots 0x6 Max Burst Length bytes 0x4B PHY Overhead Lookup Table 000 O01 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06 010 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06 020 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06 030 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06 06 040 06 06 06 06 06 06 06 06 06 06 06 06 10 10 10 10 050 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 060 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 070 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 080 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 090 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 OAO 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 OBO 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 oco 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 ODO 10 10 10 10 10 10 10 10 10 10 10 10 10 IF IF 1F OEO LP IETF IF TP 1P TPO aR IF 1P eS LP IF IF LF E OFO IF IF IF IF IF IF 1IF IF IF IF 1F IF IF LF
85. ng to process the entries in the DOCSIS configuration file Troubleshooting Tips for the Cisco UBR924 Cable Access Router 43 show controllers cable modem mac Example 4 44 The following example display for the show controllers cable modem 0 mac hardware command shows the detailed configuration of the interface driver and the MAC layer hardware The most interesting bit is the station address hardware address The MIB statistics reflect the MAC hardware counters for various events but these counters are typically reset every few seconds so their contents are not accurate in this display uBR924 show controllers cable modem 0 mac hardware PLD VERSION 32 BCM3300 unit 0 0x80 station address 0010 7b43 aa01 MAC mcfilter 01E02F00 idb 0x200EB4 ds 0x82D4748 data mcfilter 01000000 RX data PDU ring with 32 entries at 0x201D40 buffer size 1600 rx_head 0x201D40 00 pak 0x82DF844 01 02 03 04 05 06 07 08 09 10 a Osi 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 RX MAC rx_head_mac 00 01 02 03 04 05 06 07 pak 0x82E0BF4 pak 0x82DF454 pak 0x82DF64C pak 0x82E0024 pak 0x82DBF2C pak 0x82DFE2C pak 0x82E0FE4 pak 0x82DF064 pak 0x82DEC74 pak 0x82DEA7C pak 0x82DE884 pak 0x82DE68C pak 0x82DE494 pak 0x82DE29C pak 0x82DE0A4 pak 0x82DDEAC pak 0x82DDCB4 pak 0x82DDABC pak 0x82DD8C4 pak 0x82DD6CC pak 0x82DD4D4 pak 0x82DD2DC pak 0x82DDO
86. nse received T3 time out 74376 778 R02 No Ranging Response received T3 time out 74377 442 RO2 No Ranging Response received T3 time out SO GOO OAS zZ ie This output indicates that the Cisco uBR924 acquired a downstream lock successfully read a UCD and successfully read a MAP However it was unable to communicate with the CMTS after ranging through all upstream transmit power levels The Cisco uBR924 tried to communicate with the CMTS 16 times without success after which it reset the cable interface to try to find a better downstream frequency If the DHCP server could not be reached the error would look like this in the MAC error display uBR924 show controllers cable modem 0 mac errors 497989 804 D01 0 Discover sent no Offer received No available DHCP Server 498024 046 D01 0 Discover sent no Offer received No available DHCP Server 498058 284 D01 0 Discover sent no Offer received No available DHCP Server The show controllers cable modem 0 mac resets command shows only the entries in the MAC log that begin with the field cmac_Loc_RESET Collectively presenting these fields provides you with a summary of the most recent reasons why the cable interface was reset Reset messages and brief explanations are included in the following examples and in Table 6 however the reset messages in Table 6 do not commonly occur In the following example the configuration file downloaded from the TFTP server could not be r
87. nstream frequency The debug cable modem mac log command displays the log from the oldest to the newest entry After initial ranging is successful dhcp_state has been reached further RNG REQ RNG RSP messages and watchdog timer entries are suppressed from output unless the verbose keyword is used Note that CMAC_LOG_WATCHDOG_TIMER entries while in the maintenance_state are normal when using the verbose keyword Troubleshooting Tips for the Cisco UBR924 Cable Access Router 67 debug cable modem mac Examples uBR924 Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar 528383 528384 528384 528384 528384 528388 528388 528398 528398 528408 528408 528414 528418 528418 528428 528428 528438 528438 528444 528444 528444 528444 528444 528444 528474 528504 528534 68 NNAVYN ANNAN NINN NINN NV NV NN NV VNVNNN ON debug 242 242 242 742 742 243 743 2 43 2 43 743 243 243 743 243 243 2 43 2 43 243 743 2 43 243 2 43 243 743 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 992 528384 528384 528384 528384 102 102 102 102 444 444 514 516 584 586 102 654 656 726 728 796 798 102 492 494 494 494 494 494 494 494 044 050 052 078 CMAC_ CMAC 59 259 592 05 O05 O05 053 O
88. o included in the log file Event 1 Wait for the Link to Come Up Event 2 Scan for a Downstream Channel then Synchronize Event 3 Obtain Upstream Parameters Event 4 Start Ranging for Power Adjustments Event 5 Establish IP Connectivity Event 6 Establish the Time of Day Event 7 Establish Security Event 8 Transfer Operational Parameters Event 9 Perform Registration Event 10 Comply with Baseline Privacy Event 1 Enter the Maintenance State Troubleshooting Tips for the Cisco UBR924 Cable Access Router 13 Step 4 Interpret the MAC Log File and Take Action Event 1 Wait for the Link to Come Up When the Cisco uBR924 cable access router is powered on and begins initialization the first event that occurs is that the MAC layer informs the cable access router drivers that it needs to reset The LINK DOWN and LINK UP fields are similar to the shut and no shut conditions on a standard Cisco interface uBR924 show controllers cable modem 0 mac log 528302 528302 528302 528302 046 528302 048 528308 428 528308 432 528308 434 040 042 044 CMAC_LOG LINK CMAC_LOG RESET FROM DRIVER CMAC_LOG STATE CHANGE CMAC_LOG DRIVER_INIT_IDB SHUTDOWN CMAC_LOG LINK DOWN CMAC_LOG DRIVER_INIT_IDB RESET CMAC_LOG LINK DOWN CMAC_LOG LINK UP DOWN wait _for_link_up_state 0x08098D02 O0x08098E5E Event 2 Scan for a Downstream Channel then Syn
89. ontrollers cable modem 0 BCM Cable interface 0 BCM3300 unit 0 station address 0010 7b43 aa01 PLD VERSION MAC State is ranging 2 state MAC mcfilter 01E02F00 DS BCM 3116 Receiver Chip id idb 32 Ox200EB4 ds data mcfil US BCM 3037 Transmitter Chip id Tuner Rx tuner freq 699000000 snr_estimate 33406 ber estimate 0 FEC in lock gqam_mode QAM 64 symbol rate 1280000 QAM in lock Tx tx_freq 20000000 DHCP TFTP server Security server Config filename status 0x00 buffer size 1600 power level 4 0 0 32 TOD 0 0 0 0 Prev States 0x82D4748 7 ter 01000000 2 30B4 symbol rate 5055849 lock_threshold 26000 Ox3E 4 Timezone Off server RX data PDU ring with 32 entries at 0x201D40 rx_head 00 01 02 03 04 05 06 0x201D78 pak 0x8326318 pak 0x83241A0 pak 0x83239C0 pak 0x8328C70 pak 0x8325F28 pak 0x8327CBO pak 0x8323BB8 7 op buf 0x225626 buf 0x21DE5A buf 0x21C22A buf 0x22EA22 buf 0x22480E buf 0x22B1C2 buf 0x21C936 0x831BE04 7 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 status 0x80 regaddr default station address 0010 7b43 aa01 0x800000 reset_mask 0x80 local_freq 11520000 0 0 188 0 0 4 32 est pak_size 0 pak_size 0 pak_size 0 pak_size 0 pak_size 0 pak_size 0 pak_size 0 RX MAC message ring with 8 entries at 0x201E80 rx_head_mac 00 01 02 03 04 05 06 07 0x20 pak 0x8326120 p
90. ontrollers cable modem phy Displays the contents of the registers used in the downstream physical hardware of the Cisco uBR924 show controllers cable modem tuner Displays the settings for the upstream and downstream tuners used by a Cisco uBR924 Cisco IOS Release 12 0 5 T show controllers cable modem filters show controllers cable modem filters To display the registers in the MAC hardware that are used for filtering received frames use the show controllers cable modem filters command in privileged EXEC mode show controllers cable modem number filters Syntax Description number Controller number inside the Cisco uBR924 Defaults No default behavior or values Command Modes Privileged EXEC Command History Release Modification 11 3NA This command was first introduced Usage Guidelines Some of the filtering parameters are MAC hardware addresses Service IDs SIDs and upstream channel IDs Troubleshooting Tips for the Cisco UBR924 Cable Access Router 31 show controllers cable modem filters Examples MAC and SID filter information is displayed in the following example uBR924 show controllers cable modem 0 filters downstream mac message processing ds_mac_da filters filter _1 0010 7b43 aa01 filter_2 0000 0000 0000 filter 3 0000 0000 0000 filter _4 0000 0000 0000 ds_mac_da_ filter _ctrl 0x71 ds_mac_msg_ sof 0x0000 ds_mac_da_mc 01E02F00 map_parser_sids sid_1 0x0000 sid_2 0x0000
91. p Displays the timing from MAP messages to sync messages and the timing between MAP messages Cisco IOS Release 12 0 5 T debug cable modem bridge debug cable modem bridge Use the debug cable modem bridge command in privileged EXEC mode to debug bridge filter processing information on a Cisco uBR924 To turn the debugging messages off use the no form of this command no debug cable modem bridge Syntax Description This command has no keywords or arguments Defaults No default behavior or values Command Modes Privileged EXEC Command History Release Modification 11 3 NA This command was first introduced Usage Guidelines When the interface is down all bridge table entries learned on the Ethernet interface are set to discard because traffic is not bridged until the cable interface has completed initialization After the interface the line protocol is completely up bridge table entries learned on the Ethernet interface program the cable MAC data filters The cable MAC hardware filters out any received packets whose addresses are not in the filters In this way the cable interface only receives packets addressed to its own MAC address or an address it has learned on the Ethernet interface Examples The following example shows sample display output for the debug cable modem bridge privileged EXEC command uBR924 debug cable modem bridge LINEPROTO 5 UPDOWN Line protocol on Interface cable mo
92. registers in the upstream physical hardware Defaults No default behavior or values Command Modes Privileged EXEC Command History Release Modification 11 3 NA This command was first introduced Usage Guidelines To understand the output from this command consult the Broadcom specifications for the BCM3116 and BCM3037 chips Examples Physical receive registers are displayed in the following example uBR924 show controllers cable modem 0 phy receive BCM3116 Receiver Registers Chip ID C2C1 rstctl frzctl 20 gqamctl 1B I1msctl 0B tpctl 00 fmtct1l 24 ffectl 3F irqsts 09 irqmask 00 stoscm 9E rstctr 00 frzctl2 46 dvct1 30 idepth 55 eqlctl 00 tstctl 02 berctl 00 clkset 00 tunset 00 tunct1l 03 FFC coefficient registers FO 0067FFBC F1 FF880080 F4 00C5FD89 F5 FF6D0485 F2 00C1FEFB F3 FF75019D F6 FC95F690 F7 2D280000 DFE coefficient registers DO0 0636031E D04 0024FF74 DO8 0044FFF6 D12 FFD3FFEO D16 FFFC0024 D20 00020017 DO1 FBDD0314 DO5 0015007E DO9 FFE00019 D13 001A000A D17 0023FFDF D21 00250001 D02 0077FD39 DO6 000CFFC4 D10 00190005 D14 FFF3FFED D18 0029FFFF D22 0007FFF4 Troubleshooting Tips for the Cisco UBR924 Cable Access Router 53 DO3 001B00C6 DO7 FFC0004B D11 FFD3FFAD D15 0008FFFD D19 000D001E D23 FFF60014 show controllers cable modem phy ldsft BOEE ldsnre 0098AF ldif 0D004E ldbbi 00000000 ldbbq 00000000 ldali 032E00 ldaii E62AF2 ldbrfo 705A05 ldbri F9CDC200 lddrfo 00
93. return to the previous configuration Related Features and Technologies The Cisco uBR924 cable access router is intended to be used in conjunction with a Cisco uBR7200 series universal broadband router or other DOCSIS based CMTS located at the cable operator s headend facility Related Documents For related information on the Cisco uBR9724 cable access router refer to the following documents Platforms Cisco uBR924 Cable Access Router Quick Start Guide Cisco uBR924 Cable Access Router Installation and Configuration Guide Regulatory Compliance and Safety Info for the Cisco uBR924 Cable Access Router Cisco uBR7246 Installation and Configuration Guide Cisco uBR7223 Installation and Configuration Guide Cisco uBR7200 Series Configuration Notes Cisco Network Registrar for the uBR7200 Series Regulatory and Safety Compliance for the Cisco uBR7246 Regulatory and Safety Compliance for the Cisco uBR7223 Cisco uBR7200 Series Features Cisco uBR7200 Series Feature Enhancements Cisco uBR7200 Series Feature Enhancements in Release 12 0 Cisco uBR7200 Series Installation and Configuration Guide The Cisco uBR924 cable access router is a single platform standalone device it works in conjunction with the Cisco uBR7200 series universal broadband routers 2 Cisco IOS Release 12 0 5 T Related Documents Prerequisites In order to use the Cisco uBR924 cable access router for data over cable applications the following conditions must b
94. rollers Cable Modem MIB Statistics Field Descriptions Field Description DS fifo full Number of times the downstream receive buffer on the Cisco uBR924 has become full Rerequests Number of registration requests sent by the Cisco uBR924 to the CMTS DS mac msg overruns Number of times the DMA controller has had a downstream MAC message and there were no free MAC message buffer descriptors to accept the message DS data overruns Number of times the DMA controller has had downstream data and there were no free data PDU buffer descriptors to accept the data Qualified maps Number of valid MAP messages received by the Cisco uBR924 Qualified syncs Number of times the Cisco uBR924 has received synchronization with the downstream channel CRC fails Number of cyclic redundancy checksums generated by the far end device that did not match the checksums calculated from the message portions of the packets received HDR check fails Number of cyclic redundancy checksums generated by the far end device that did not match the checksums calculated from the MAC headers of the packets received The MAC header CRC is a 16 bit Header Check Sequence HCS field that ensures the integrity of the MAC header even in a collision environment Data pdus Total number of data PDUs protocol data units of all types received by the cable interface Mac msgs Number of MAC messages received by the cable interface Valid
95. rollers cable modem filters Displays the registers in the MAC hardware that are used for filtering received frames show controllers cable modem Displays the mini slot lookup table inside a Cisco uBR924 lookup table show controllers cable modem mac Displays detailed MAC layer information for a Cisco uBR924 show controllers cable modem phy Displays the contents of the registers used in the downstream physical hardware of the Cisco uBR924 show controllers cable modem tuner Displays the settings for the upstream and downstream tuners used by a Cisco uBR924 Troubleshooting Tips for the Cisco UBR924 Cable Access Router 25 show controllers cable modem bpkm show controllers cable modem bpkm To display information about the baseline privacy key management exchange between the Cisco uBR924 cable access router and the headend CMTS use the show controllers cable modem bpkm command in privileged EXEC mode show controllers cable modem number bpkm Syntax Description number Controller number inside the Cisco uBR924 cable access router Defaults No default behavior or values Command Modes Privileged EXEC Command History Release Modification 11 3 NA This command was first introduced Usage Guidelines Baseline privacy key management exchanges take place only when both the Cisco uBR924 and the CMTS are running code images that support baseline privacy and the privacy class of service is enabled via the
96. s and how to use MIBs see Cisco s MIB web site on CCO at http www cisco com public sw center netmgmt cmtk mibs shtml CATV Originally stood for Community Antenna Television Now refers to any coaxial or fiber cable based system that provides television services cable modem CM A modulator demodulator device that is placed at subscriber locations to convey data communications on a cable television system The Cisco uBR924 cable access router is also a cable modem 4 Cisco IOS Release 12 0 5 T List of Terms Cable Modem Termination System CMTS A termination system located at the cab le television system headend or distribution hub which provides complementary functionality to the cable modems enabling data connectivity to a wide are network cable router A modular chassis based router optimized for data over CATV hybrid fiber coaxial HFC applications carrier A signal on which another lower frequency signal is modulated in order to transport the lower frequency signal to another location Carrier to Noise C N also CNR The difference in amplitude between the desired RF carrier and the noise in a portion of the spectrum channel A specific frequency allocation and bandwidth Downstream channels used for television are 6 MHz wide in the United States 8 MHz wide in Europe CM cable modem CMTS Cable Modem Termination System coaxial cable The principal physical media over which CATV systems are built
97. set causes out of the MAC log file and summarizes them in a mini report state Optional Displays a summary of the MAC state Defaults No default behavior or values Command Modes Privileged EXEC Command History Release Modification 11 3 NA This command was first introduced Usage Guidelines MAC log messages are written to a circular log file even when debugging is not turned on These messages include timestamps events and information pertinent to these events Use the show controllers cable modem mac log command to view MAC log messages If the Cisco uBR924 interface fails to come up or resets periodically the MAC log will capture what happened For example if an address is not obtained from the DHCP server an error is logged initialization starts over and the Cisco uBR924 scans for a downstream frequency The most useful keywords for troubleshooting a Cisco uBR9724 are log errors and resets See Example 1 Example 2 and Example 3 38 Cisco IOS Release 12 0 5 T show controllers cable modem mac Example 1 The following sample display shows the MAC log file for a cable modem interface that has successfully registered with the CMTS uBR924 show controllers cable modem 0 mac log 00 14 24
98. sid_3 0x0000 sid_4 0x0000 ds_mac_filter_ctrl 0x00 us_channel_id 0x0000 ds_pid 0x0000 mac_msg proto ver FF 00 reg rang req sid 0x0000 downstream data processing ds_data_da_filter_table filter _1 0010 7b43 aa01 filter_2 0000 0000 0000 filter 3 0000 0000 0000 filter _4 0000 0000 0000 ds data_da_filter_ctrl 0x61 ds_pdu_sof 0xDEAD ds_data_da_mc 01000000 upstream processing us_ctrl_status 0x04 Minislots per request 0x01 burst_maps map 0 0 map 1 0 map 2 0 map 3 0 bytes per minislot_exp 0x04 us_map_parser_minislot_adv 0x03 ticks per _minislot 0x08 maint_xmit 0x0001 us_sid_table sid_1 0x0000 sid_2 0x0000 sid_3 0x0000 sid_4 0x0000 max_re_req 0x0010 rang fifo 0x00 Table 5 briefly describes some of the fields shown in the display For more information see the Broadcom documentation for the BCM3300 chip Table 5 Show Controllers Cable Modem Filters Field Descriptions Field Description ds_mac_da_filters Shows the MAC address of the cable interface and the MAC address of any Ethernet MAC it is bridging ds_mac_da_filter_ctrl Downstream MAC filter control for data ds_mac_msg_sof Downstream MAC message start of frame ds_mac_da_mc Downstream MAC control filter for data map_parser_sids Service IDs used for upstream bandwidth allocation ds_mac_filter_ctr Downstream MAC filter control for MAC messages us_channel_id Upstream channel ID ds_pid Downstream pac
99. splay high level controller information about a Cisco uBR924 cable access router use the show controllers cable modem command in privileged EXEC mode show controllers cable modem number Syntax Description number Controller number inside the Cisco uBR924 Defaults No default behavior or values Command Modes Privileged EXEC Command History Release Modification 11 3 NA This command was first introduced Usage Guidelines The show controllers cable modem display begins with information from the first few registers of the Broadcom BCM3300 chip Next is buffer information for the receive receive MAC message buffer descriptor and packet descriptor rings Then comes MIB statistics from the BCM3300 chip DMA base registers to indicate where the rings start global control and status information and finally interrupts for the interrupt code When using this command be sure to check the tx_count and the tx_head and tx_tail values for the buffer descriptor TX BD and packet descriptor TX PD rings The tx_count should be greater than 0 and the tx_head and tx_tail values should not be equal If these values do not change for a long period of time it indicates there are packets stuck on the ring This condition is often caused by the headend not giving grants 20 Cisco IOS Release 12 0 5 T show controllers cable modem Examples Following is sample output for the show controllers cable modem 0 command uBR924 show c
100. table show controllers cable modem mac Displays detailed MAC layer information for a Cisco uBR924 show controllers cable modem phy Displays the contents of the registers used in the downstream physical hardware of the Cisco uBR924 show controllers cable modem tuner Displays the settings for the upstream and downstream tuners used by a Cisco uBR924 Troubleshooting Tips for the Cisco UBR924 Cable Access Router 27 show controllers cable modem des show controllers cable modem des To display information about the Data Encryption Standard DES engine registers use the show controllers cable modem des command in privileged EXEC mode show controllers cable modem number des Syntax Description number Controller number inside the Cisco uBR924 Defaults No default behavior or values Command Modes Privileged EXEC 28 Cisco IOS Release 12 0 5 T show controllers cable modem des Command History Examples Release Modification 11 3 NA This command was first introduced DES engine registers are displayed in the following example uBR924 show controllers cable modem 0 des downstream des ds_des key table key 0 even 0 key 1 even 0 key 2 even 0 key 3 even 0 odd odd odd odd ds_des_cbc_iv_table iv 0 even 0 iv 1 even 0 iv 2 even 0 iv 3 even 0 ds_des_sid_table sid_1 0x0000 sid_2 0x0000 ds_ des sid _enable 0x80 ds_des_ctrl 0x2E ds_des_ sv 0
101. ter the DHCP and security operations are successful the Cisco uBR924 downloads operational parameters via a configuration file located on the cable company s TFTP server The CMAC_LOG DHCP CONFIG FILE NAME field shows the filename containing the transmission parameters 508177 164 CMAC_ LOG STATE CHANGE configuration file state 508177 166 CMAC LOG LOADING CONFIG FILE platinum cm 508178 280 CMAC LOG CONFIG FILE PROCESS COMPLETE Event 9 Perform Registration After the Cisco uBR924 is initialized authenticated and configured it requests to be registered with the headend CMTS The cmac_Loc_cos_ ASSIGNED_sID field assigns a class of service CoS number and a service ID SID Multiple CoS entries in the configuration file imply that multiple SIDs are supported by the cable access router If several cable access routers use the same configuration file they will have the same CoS numbers but will be assigned different SIDs A successful registration is indicated by the CMAC LOG REGISTRATION OK field 508178 300 CMAC LOG STATE CHANGE registration_state 508178 302 CMAC LOG REG REQ MSG QUEUED 508178 306 CMAC LOG REG REQ TRANSMITTED 508178 310 CMAC LOG REG RSP MSG RCVD 508178 312 CMAC_ LOG COS ASSIGNED SID 5 19 508178 314 CMAC_ LOG COS ASSIGNED SID 6 20 508178 316 CMAC LOG COS ASSIGNED SID 7 21 508178 318 CMAC LOG RNG REQ QUEUED 19 508178 320 CMAC LOG REGISTRATION OK Event 10 Comply with Baseline Privacy Keys for
102. ters from a configuration file stored on the cable company s TFTP server Perform registration The Cisco uBR924 registers with the CMTS After it is initialized authenticated and configured the Cisco uBR924 is authorized to forward traffic onto the cable network Comply with baseline privacy If the software image running on the Cisco uBR924 includes baseline privacy link level encryption keys are exchanged between the CMTS and the Cisco uBR924 10 Enter the operational maintenance state As soon as the Cisco uBR924 has successfully completed the above sequence it enters operational maintenance state Telnet to the IP address assigned to the cable interface or Ethernet interface If the interface is not up you will need to access the Cisco IOS software via the RJ 45 console port which is a physical port on the back of the Cisco uBR924 Note For security purposes the console port on the Cisco uBR924 may have been deactivated by the cable service company prior to installation at the subscriber site Cisco IOS Release 12 0 5 T Step 3 Display the Cisco uBR924 s MAC Log File Step 3 Display the Cisco UBR924 s MAC Log File A MAC layer circular log file is stored inside the Cisco uBR924 This file contains a history of the log messages such as state event activities and timestamps This is the most valuable information for troubleshooting the cable interface The MAC log file is displaye
103. the Cisco uBR924 and the CMTS are running code images that support baseline privacy and the privacy class of service is enabled via the configuration file that is downloaded to the cable access router Baseline privacy code images for the Cisco uBR924 contain k1 in the code image name Examples The following example shows debug output when the headend does not have privacy enabled uBR924 debug cable modem bpkm errors cm_bpkm_fsm machine KEK event state EVENT_4 TIMEOUT STATE B AUTH WAIT new state STATE B AUTH WAI cm_bpkm_fsm machine KEK event state EVENT_4 TIMEOUT STATE B AUTH WAIT new state STATE B AUTH WAI SLINEPROTO 5 UPDOWN Line protocol on Interface cable modem0O changed state to down cm_bpkm_fsm machine KEK event state EVENT_1 PROVISIONED STATE A START new state STATE B AUTH WAIT SLINEPROTO 5 UPDOWN Line protocol on Interface cable modem0 changed state to up Troubleshooting Tips for the Cisco UBR924 Cable Access Router 59 debug cable modem bpkm Related Commands 60 Command Description debug cable modem bridge Debugs bridge filter processing information on a Cisco uBR924 debug cable modem error Enables debugging messages for the cable interface driver on a Cisco uBR924 debug cable modem interrupts Debugs Cisco uBR924 interrupts debug cable modem mac Troubleshoots the Cisco uBR924 MAC layer debug cable modem ma
104. tion 11 3 NA This command was first introduced Usage Guidelines This command displays detailed output about the sanity checking of received frame formats the acquisition of downstream QAM FEC lock the receipt or non receipt of SYNC messages from the CMTS reception errors and bandwidth request failures Examples The following example shows sample display output for the debug cable modem error privileged EXEC command uBR924 debug cable modem error Mar 7 20 16 29 AcquireSync Update rate is 100 Hz Mar 7 20 16 30 1st Sync acquired after 1100 ms Mar 7 20 16 30 Recovery loop is locked 7 9 Mar 7 20 16 30 2nd Sync acquired after 100 ms Mar 7 20 16 30 Recovery loop is locked 10 15 Troubleshooting Tips for the Cisco UBR924 Cable Access Router 63 debug cable modem error Related Commands 64 Command Description debug cable modem bpkm Debugs baseline privacy information on a Cisco uBR924 debug cable modem bridge Debugs bridge filter processing information on a Cisco uBR924 debug cable modem interrupts Debugs Cisco uBR924 interrupts debug cable modem mac Troubleshoots the Cisco uBR924 MAC layer debug cable modem map Displays the timing from MAP messages to sync messages and the timing between MAP messages Cisco IOS Release 12 0 5 T debug cable modem interrupts debug cable modem interrupts To debug Cisco uBR9 24 interrupts use the debug cable mo
105. ug cable modem error Enables debugging messages for the cable interface driver on a Cisco uBR924 debug cable modem interrupts Debugs Cisco uBR924 interrupts debug cable modem map Displays the timing from MAP messages to sync messages and the timing between MAP messages 72 Cisco IOS Release 12 0 5 T debug cable modem map debug cable modem map To display the timing from MAP messages to sync messages and the timing between MAP messages on a Cisco uBR9724 cable access router use the debug cable modem map command in privileged EXEC mode To turn the debugging messages off use the no form of this command no debug cable modem map Syntax Description This command has no keywords or arguments Defaults No default behavior or values Command Modes Privileged EXEC Command History Release Modification 11 3 NA This command was first introduced Examples The following example shows display output for the debug cable modem map privileged EXEC command uBR924 debug cable modem map Cable Modem MAP debugging is on UuBR924 Mar 7 20 12 08 595322 942 Min MAP to sync 72 Mar 7 20 12 08 595322 944 Max map to map time is 40 Mar 7 20 12 08 595322 982 Min MAP to sync 63 Mar 7 20 12 08 595323 110 Max map to map time is 41 Mar 7 20 12 08 595323 262 Min MAP to sync 59 Mar 7 20 12 08 595323 440 Max map to map time is 46 Mar 7 20 12 09 595323 872 Min MAP to sync 58 Troubleshooting Tips for
106. um It defines the radio frequency interface specification for high speed data over cable systems CiscoWorks Network management program for planning troubleshooting and monitoring Cisco internetworks CiscoWorks uses Simple Network Management Protocol SNMP to monitor all SNMP devices For more information about CiscoWorks on CCO follow this path Products amp Ordering Cisco Products Network Management CiscoWorks For more information about CiscoWorks on the Documentation CD ROM follow this path Cisco Product Documentation Network Management CiscoWorks Radio Frequency Interface RFI MIB Specific to Data Over Cable Service Interface Specification DOCSIS cable implementations The RIF MIB provides an interface that permits management of the Cisco uBR924 cable access router over the cable or Ethernet interface Using SNMP management applications this MIB allows access to statistics such as MAC driver configuration and counters Cable Device MIB Records statistics related to the configuration and status of the Cisco uBR924 cable access router Statistics include an events log and device status The Cable Device MIB is very similar to the RFI MIB in that both allow access to statistics they are different in that the Cable Device MIB reports statistics on the cable access router while the RFI MIB reports statistics on the radio frequency transmissions over the cable television line For descriptions of supported MIB
107. x0F00 odd odd odd odd TI RD RA EA Or SO a ds_unencrypted_length 0x0C upstream des us_des_key_table key 0 even 0 odd odd sid_3 0x0000 key 1 even 0 key 2 even 0 key 3 even 0 us_des_cbc_iv_table iv iv iv 0 iv 1 even 2 ou even 0 0 0 0 odd odd odd odd odd odd 0 DD O ar E o S w pb_req_bytes_to_minislots 0x10 us_des_ctrl 0x00 us des sid_1 0x1234 ds_unencrypted_length 0x0C sid_4 0x0000 Table 4 briefly describes some of the fields shown in the display For more information see the Broadcom documentation for the BCM3300 chip Table 4 Show Controllers Cable Modem DES Field Descriptions Field Description ds_des_key_table Table showing downstream DES keys ds_des_cbc_iv_table Table of downstream DES Cipher Block Chaining mode information ds_des_sid_table Table showing the SID values to be enabled for DES encryption ds_des_sid_enable Controls which SID entries in the SID table are enabled for encryption In the above example none of the entries are enabled for encryption ds_des_ctrl Control register that controls the operating mode of the downstream DES engine ds_des_sv DES security version register the range of the version field in the Baseline Privacy Interface BPI extended headers that will be accepted by the hardware High byte is upper limit low byte is lower limit The Cisco uBR924 will acc
108. xA0 regaddr pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa pa Ox82D480C pa pa pa pa pa pa pa pa 0x800000 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 6 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 reset_mask default station address 0010 7b43 aa01 show controllers cable modem mac TX BD ring with 8 entries at 0x201FB8 0 head_txp 0 tail_txp tx_head tx_tail TX PD ring with 8 entries at 0x202038 tx_head_pd tx_tail_pd 00 01 02 03 04 05 06 07 0x201FB8 0x201FB8 pak 0x000000 pak 0x000000 pak 0x000000 pak 0x000000 pak 0x000000 pak 0x000000 pak 0x000000 pak 0x000000 buf 0x200000 buf 0x200000 buf 0x200000 buf 0x200000 buf 0x200000 buf 0x200000 buf 0x200000 buf 0x200000 0x82D488 0x82D488 status 0x00 status 0x00 status 0x00 status 0x00 status 0x00 status 0x00 status 0x00 status 0x20 tx_count 8 8 pa pa pa pa pa pa pa pa 0 0 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 k size 0 0x202038 0 0x202038 0 00 status 0x00 bd_index 0x00

Cisco Systems UBR924 User's Manual

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