Nortel Networks CG030601 User's Manual
Contents
1. Description virtual circuit1 State Enabled 7 Interface Type C Public Private Local IP Address fi0111 000 Subnet Mask 255 255 255 0 Remote IP Address hoii pa ho oS arn fso00 OO bits second Be 4000 bits Be o bits N RTEL LOK Cancel NETWORKS 4 Inthe VC field type the virtual circuit number 5 Inthe Description field enter a description of the virtual circuit 6 From the State menu select whether this virtual circuit is enabled or disabled 7 Inthe Local IP Address field enter the virtual circuit IP address 8 In the Subnet Mask field enter the subnet mask of the IP address 9 Inthe Remote IP Address field enter the IP address of the remote end of this virtual circuit 10 In the DLCI field enter the assigned DLCI number for this virtual circuit 11 In the CIR field enter the PVC s committed information rate 12 In the Be field enter the committed burst for this circuit 13 In the BE field enter the excess burst for this circuit 14 Click OK to create this virtual circuit CG030601 2 00 July 2003 Page 13 of 14 Configuration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway Copyright 2003 Nortel Networks All rights reserved Nortel Networks the Nortel Networks logo the Globemark Unified Networks and Contivity are trademarks of Nortel Networks Information in this document is subject to change without not2. Kb s 56 Kb s or 64 Kb s If you configure CIRs for these virtual circuits at the central site you can use CIR enforcement described in the next section to prevent the big pipe from sending traffic that exceeds the PVC CIRs Committed burst rate and excess burst rate The committed burst rate Bc defines the number of bits that the CES can transmit over a specified time interval Tc when congestion is occurring The excess burst Be defines the number of extra bits that the CES attempts to send over the Tc when there is no congestion Both the Bc and the Be are values that you configure The sum of the Bc and the Be is the maximum amount of traffic that can travel across the network per Tc when there is no congestion If you set the Be to a value greater than zero the CES can send traffic exceeding the CIR To enforce the CIR that is to limit traffic that the CES can send to the amount of the CIR set the Be to 0 CG030601 2 00 July 2003 Page 3 of 14 Configuration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway Congestion control Network congestion can degrade network performance Congestion occurs when a node receives more frames than it can process or sends more frames than the transmission line can handle The frame relay network informs the nodes of congestion so that they can reduce the amount of traffic across the network In the frame relay packet header the
3. not in use Vv PPP Configure Statistics _ Seydi NETWORKS 2 Inthe Select column click the radio button beside the Interface you want to configure 3 Click Configure to get the next screen illustrated in Figure 3 CG030601 2 00 July 2003 Page 6 of 14 Configuration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway Figure 3 Configure WAN Interface IDENTITY Interfaces gt Configure HELP LOGOFF LAN WAN IPX PF DATE amp TIME SERVERS Slot 6 ADMIN Interface 1 N STATUS HELP Configure WAN Interface Description frarne relay 6 1 Circuit ID 1 Interface Filter deny all z Contivity Interface Filter not in use New Interface Filter Protocol FR 7 Data Rate 1536000 bps gt Configure OK Cancel Apply Refresh NO RTEL NETWORKS 4 Enter the description and circuit number The circuit number is only relevant for administration purposes only Not used by system for identification of circuit 5 For the Interface Filter field select the appropriate interface filter from the drop down list 6 For the Protocol field select Frame Relay Service from the drop down list 7 For the Data Rate field select the appropriate line rate from the drop down list Selecting a management type You can specify the management protocol that the router and the frame relay network use to communicate status information Routers conne
4. the DLCI Example CES config subif ip remote 10 1 1 2 CG030601 2 00 July 2003 Page 11 of 14 Configuration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway Using the Web interface to configure To configure virtual circuits through the Web interface follow these steps 1 Go to the Frame Relay Interface screen shown in Figure 4 2 To bring up the Virtual Circuits page Figure 5 click Configure Virtual Circuits button This page lists all virtual circuits that have been configured for this Frame Relay interface Figure 5 Frame Relay Virtual Circuits page ewe Interfaces gt Configure gt FR gt VC E LAN WAN IPX N Interface 1 DATE amp TIME Virtual Circuits 2 Asa peie Description None State Disabled gt VC Protocol None Interface Type C Public Private Local IP Address None Subnet Mask s t Remote IP Address None DLCI None t S CIR None bits second Be None bit5 N RTEL Be None bits NETWORKS Statictira xl 3 To add a virtual circuit click Add and the following screen appears Figure 6 CG030601 2 00 July 2003 Page 12 of 14 Configuration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway Figure 6 Add Virtual Circuit Screen cena A Interfaces gt Configure gt FR gt VC gt Add Add Virtual Circuit vc fi
5. Configuration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway Introduction to Frame Relay Frame relay is a high speed packet switching WAN protocol that connects geographically dispersed LANs A public network provider usually offers frame relay However private organizations can acquire and manage their own frame relay networks as well Frame relay is a connection oriented protocol This means it relies on end to end paths between devices connected across the network It implements these connections using permanent virtual circuits PVCs Frame relay assumes that networks use transmission lines with low error rates such as digital transmission media Therefore frame relay provides only basic error detection with no error recovery This minimizes the processing required for each packet allowing frame relay networks to operate at high speeds with few network delays Because frame relay performs only basic error checking end stations running upper layer protocols such as the Internet Protocol IP are responsible for resending packets that did not transmit correctly the first time Permanent virtual circuits A permanent virtual circuit PVC is a dedicated logical path that connects two devices over a network When configured a PVC is always available to the connected devices a PVC does not require setup before data can travel across the network nor does it need to be di
6. cted back to back also use a management protocol to exchange status information The following list describes your options e DLCMI None provides no management interface between the router and the frame relay network In the absence of management support you must configure all PVCs manually e Rev 1 LMI provides user side management services as specified by Revision 1 of the LMI standard CG030601 2 00 July 2003 Page 7 of 14 Configuration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway e ANSI T1 617D provides user side management services as specified in Annex D to ANSI standard T1 617 1991 This is the default value e CCITT Annex A provides user side management services as specified by the ITU T formerly CCITT Configuring management type using CLI To specify the link manager type navigate to the serial interface and enter Frame relay lmi type lt lmi type gt lt Imi type gt can be ANSI for ANSIT1 617 Annex D service ilmi for Rev 1 LMI none for no management service q933a for CCITT Annex A service Monitoring the connection You can monitor the status of your frame relay network connection by setting the time intervals for the CES to send messages that verify the integrity of the link Polling interval The polling interval specifies the amount of time between status inquiry messages that the CES transmits Status inquiry messages cause a netw
7. ice Nortel Networks assumes no responsibility for errors that might appear in this document If you found this document useful and would like to see more similar documents please send your feedback to CRCONT nortelnetworks com with the subject heading How To Documentation If after following this guide you are still having problems please ensure you have carried out the steps exactly as in this document You should also check the Nortel Networks FAQs Solutions Search Knowledge Database for additional help If problems still persist please contact Nortel Networks Customer Support Technical Support Contact Information Nortel Networks is committed to bettering the customer experience through its Customer TouchPoint Program CTP where in most countries one number can be used to contact Nortel Networks To obtain regional telephone contact information please visit the following website http www nortelnetworks com help contact qlobal CG030601 2 00 July 2003 Page 14 of 14
8. igure description and circuit number The circuit number is only relevant for administration purposes only Not used by system for identification of circuit CES config if description frame relay 61 CES config if circuit id 1 Configure line rate and interface filter CES config if filter deny all quotes are needed for filter names with 2 words or more CES config if data rate 1536 parameter is entered in kilobits only valid parameters are multiples of 64k starting at 64k and ending at 2048k Configure frame relay connection type with the following command Frame relay connection type lt connection type gt lt connection type gt can be direct for placing 2 FR CES ports back to back switched default to connection to a frame relay cloud Example CES config if frame relay connection type switched 2 00 July 2003 Page 5 of 14 Configuration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway Enabling Frame Relay using Web interface 1 Click System gt Wan to bring up the following screen Figure 2 WAN Interface list screen Q IDENTITY Interfaces HELP LOGOFF LAN WAN WAN Interfaces Select Slot Interface Description Interface Filter Enabled Protocol s 5 1 deny all Contivity Interface Filter not in use Vv PPP e 5 2 deny all Contivity Interface Filter not in use Vv PPP 9 6 1 permit all Contivity Interface Filter
9. maps a remote network address such as an IP address to a local DLCI number IP uses the Address Resolution Protocol ARP ARP dynamically generates an ARP table of addresses and DLCI numbers by sending messages back and forth to each network node to gather address information This process increases broadcast traffic across the network Committed information rate The committed information rate CIR is the rate at which the network supports data transfer under normal operations Its name is descriptive you have a contract with your carrier who has committed to providing a given throughput here called the committed information rate The CIR is measured in bits per second You configure this value that the carrier provides per virtual circuit When configuring the CIR consider the following CIR of 0 You can contract with a carrier for a CIR of 0 which yields best effort service at low cost The carrier transmits data but does not commit to providing a specified throughput To configure a CIR of 0 set both the throughput which is the CIR and the committed burst Bc to 0 and set the excess burst Be to a value greater than 0 For more information about burst rates see the next section Committed burst rate and excess burst rate Maximum CIR The maximum CIR should not be greater than the speed of the access line on the slower end of a virtual circuit In a big pipe little pipe topology likely CIRs at the remote sites would be 32
10. nagement protocols Frame relay is an access protocol that runs between a CES or data terminal equipment DTE and a switch or data communications equipment DCE The CES and the switch use the Data Link Control Management Interface DLCMI to exchange information about the interface and the status of each virtual circuit DLCMI supports three standard data link management specifications LMI ANSI T1 617 Annex D and CCITT now ITU T Q 933 Annex A e The networking industry first developed the local management interface LMI specification The LMI approach is asymmetric the router sends a status inquiry message to the network signaling that the router s connection to the network is functioning The network replies with a status response e ANSI modified the LMI specification and incorporated it as Annex D to ANSI standard T1 617 The ANSI method is generally similar to the LMI approach e The CCITT now ITU T modified the ANSI standard and adopted it as Annex A to Q 933 The CCITT Annex A specification is similar to Annex D but it uses an international numbering scheme Be sure to configure the frame relay interface on the CES to use the same management protocol as the switched network to which it is connected CG030601 2 00 July 2003 Page 2 of 14 Configuration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway Address resolution for PVCs Address resolution for PVCs
11. onfiguration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway Configuring Frame Relay virtual circuits You can configure one network virtual circuit for each Frame Relay DLCI Using CLI to configure Follow these steps to configure a frame relay virtual circuit 1 Define a virtual circuit Frame relay subinterface lt integer gt lt integer gt is the virtual circuit number from 1 to 10 After you configure a virtual circuit number the CLI returns a prompt that specifies your current working location For example the following command defines virtual circuit 1 on the frame relay circuit CES config if frame relay subinterface 1 CES config subif Add a description for this virtual circuit CES config subif description lt virtual circuit name gt lt virtual circuit name gt can be any wording used to properly describe this virtual circuit Example CES config subif description virtual circuit1 Define the Frame Relay encapsulation CES config subif encapsulation lt encaps_type gt lt encaps_type gt is the Frame Relay encapsulation type Currently the only encaps type is MPoFR Example CES config subif encapsulation MpoFR Define whether the virtual circuit is a public or private interface CES config subif no public By default the virtual circuit is set to public Example on how to change virtual circuit to be a pri
12. ork to respond with a link integrity verification message or full status message Successful completion of the request response handshake verifies the status of the CES frame relay network link The default polling interval is 10 seconds If this value does not match what the network requests specify a new value in the range of 5 to 30 seconds Configuring polling interval using CLI To configure the polling interval navigate to the serial interface and enter Frame relay lmi t39ldte lt integer gt lt integer gt is the polling interval from 5 to 30 seconds The default is 10 Full enquiry interval The full enquiry interval specifies the interval between full status inquiry messages that the CES transmits Full status inquiry messages cause the network to send a full status report message which lists all PVCs and their status active or inactive and new or previously established The default full enquiry interval value 6 tells the CES to send a full status inquiry every 6 polling intervals For example with a polling interval of 10 and CG030601 2 00 July 2003 Page 8 of 14 Configuration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway a full enquiry interval of 6 the CES transmits a full status inquiry every 60 seconds With a polling interval of 20 and a full enquiry interval of 30 the CES transmits a full status inquiry every 10 minutes 600 seconds U
13. re are two bits that the network sets to alert nodes of network congestion These bits as defined by the frame relay specification are the forward explicit congestion notation FECN bit and the backward explicit congestion notation BECN bit If the network detects congestion it alerts the CES in the same direction as the received frame by changing the frame s FECN bit from 0 to 1 For nodes in the opposite direction of the received frame it changes the frame s BECN bit from 0 to 1 CG030601 2 00 July 2003 Page 4 of 14 Configuration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway Configuring Frame Relay on CES Configuring frame relay on the CES can be accomplished through the command line interface CLI or through the Web GUI To enable Frame Relay through the CLI 1 CG030601 To configure a physical interface on a slot and connector navigate to the top level box prompt and enter Interface serial lt s ot_number gt lt interface_number gt slot_number is the number of the slot on which the link module is located interface_number is the number of the module on which the slot is located After you configure a physical interface the CLI returns a prompt that specifies your current working location For example the following command configures a serial interface on slot 6 interface 1 CES config interface serial 6 1 CES config if Conf
14. sconnected after data has passed Because many PVCs can coexist for one physical line devices can share the bandwidth of the transmission line Frame Relay packets The structure of a frame relay packet is shown in the following figure Figure 1 Frame Relay packet Flag Frame Relay Information FCs Flag Header Z DLCI CIR EA DLCI FECNIBECN DE EA 876543 2 1 a 65 4 3 2 1 The packet s header field includes the following components Data link connection identifier DLCI The DLCI is the virtual circuit identification number The frame relay network uses the DLCI to direct basic data flow You configure the DLCI for PVCs CG030601 2 00 July 2003 Page 1 of 14 Configuration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway Command response bit C R ITU T formerly CCITT standards do not use this bit Forward explicit congestion notification FECN and backward explicit congestion notification BECN The FECN and BECN indicate congestion on the network For information about how the frame relay software uses these bits see Congestion Control Discard eligibility DE The DE bit allows the router to mark specific frames as low priority discard eligible before transmitting them to the frame relay network Extended address bit EA The EA bit signals whether the next byte is part of the address This bit indicates the last byte of the DLCI Ma
15. sing CLI to configure To configure the full enquiry interval navigate to the serial interface and enter Frame relay lmi n39ldte lt integer gt lt integer gt is the full enquiry interval from 1 to 255 The default is 6 Using Web GUI to configure To set the connection type Frame Relay management type polling interval and the full enquiry interval follow these steps 1 Bring up the WAN Interface screen Figure 3 for the interface you are configuring 2 Click Configure to get the next screen Figure 4 Figure 4 Frame Relay Interface screen i Interfaces gt Configure gt Frame Relay o IDENTITY HEL OGOF Slot 6 ADMIN i Interface 1 STATUS HELP Frame Relay Interface Debug T Connection Type Switched LMI Type ANSIT1 617 AnnexD gt LMI Poll Interval Counter sc Oo o j LMI Poll Interval Timer fo Note Modifying the LMI parameters will cause the link to be brought down and brought up with the new parameters Configure Virtual Circuits Statistics OK Cancel Apply Refresh N RTEL NETWORKS 3 For the Connection Type field select Switched if CES connects directly for Frame Relay switch or Direct if CES is back to back with another CES 4 For LMI type field select Frame Relay management 5 For LMI Poll Interval Timer field enter the Frame Relay polling interval 6 For LMI Poll Interval Counter field enter the full enquiry interval CG030601 2 00 July 2003 Page 9 of 14 C
16. vate interface CES config subif no public Example on how to change virtual circuit to be a public interface CES config subif public CG030601 2 00 July 2003 Page 10 of 14 Configuration Guide NORTEL Contivity Secure IP Services Gateway NETWORKS Frame Relay on Contivity Secure IP Services Gateway 5 Define the DLCI number for this virtual circuit CES config subif dlci lt integer gt lt integer gt is the DLCI number for this connection from 16 991 Example CES config subif dlci 100 6 Configure the traffic shaping parameters CIR committed burst and excess burst CES config subif traffic shape lt CIR gt lt Committed_Burst gt lt Excess_Burst gt lt CIR gt is the committed information rate assigned to the DLCI in bits per second lt Committed_Burst gt is the committed burst rate for this DLCI in bits lt Excess_Burst gt is the excess burst rate for this DLCI in bits Example CES config subif traffic shape 5000 4000 0 7 Configure the local IP address of this interface CES config subif ip local lt address gt lt mask gt lt address gt is the IP address for this interface lt mask gt is the subnet mask for this interface Example CES config subif ip local 10 1 1 1 255 255 255 0 8 Configure the IP address of device on the remote end of this virtual circuit CES config subif ip remote lt address gt lt address gt is the IP address of the device on the other end of
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