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Avaya Configuring Data Compression Services User's Manual

1. ARN Backbone Node BN and System 5000 e Compression for a Bay Networks Fast Routing Engine FRE module at 4 x 128 KB s compressed throughput full duplex or 512 KB s aggregate compressed throughput 117352 C Rev 00 e Compression for a BayStack AN platform at 2 x 64 KB s compressed throughput full duplex or 128 KB s aggregate compressed throughput Starting Compression e Compression on all intelligent link interface ILI modules that support serial and ISDN BRI ports e Compression on MCT1 and MCE lines Hardware Based Data Compression for the BN Platform The FRE 2 060E processor module with Advanced Compression Coprocessor daughterboard available with BayRS Version 12 20 for the BN platform extends hardware based data compression services to the link modules listed in Table 1 1 Table 1 1 Link Modules Supported by FRE 2 060E Processor with Advanced Compression Coprocessor Daughterboard Link Modules Part Number Octal Sync 5008 Oct Sync HWComp32 AG2104037 Oct Sync HWComp128 AG2104038 Dual Port Multi Channel T1 5945 Single Port Multi Channel T1 5944 Dual Port Multi Channel E1 77007 Single Port Multi Channel E1 77009 75 ohm Dual Port MCE1 II AG2111004 75 ohm Single Port MCE1 II AG2111003 120 ohm Dual Port MCE1 II AG2111002 120 ohm Single Port MCE1 II AG2111001 DB15 Quad MCT1 AG2111007 Ethernet Sync Advanced Filter 5431 117352 C Rev 00
2. Configuring Data Compression Services BayRS Version 12 20 Site Manager Software Version 6 20 Part No 117352 C Rev 00 June 1998 GS Bay Networks a Bay Networks 4401 Great America Parkway 8 Federal Street Santa Clara CA 95054 Billerica MA 01821 Copyright 1998 Bay Networks Inc All rights reserved Printed in the USA June 1998 The information in this document is subject to change without notice The statements configurations technical data and recommendations in this document are believed to be accurate and reliable but are presented without express or implied warranty Users must take full responsibility for their applications of any products specified in this document The information in this document is proprietary to Bay Networks Inc The software described in this document is furnished under a license agreement and may only be used in accordance with the terms of that license A summary of the Software License is included in this document Trademarks AN BN FRE and Bay Networks are registered trademarks and Advanced Remote Node ARN ASN BayRS BayStack System 5000 and the Bay Networks logo are trademarks of Bay Networks Inc All other trademarks and registered trademarks are the property of their respective owners Restricted Rights Legend Use duplication or disclosure by the United States Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Dat
3. This warranty does not apply if the media has been damaged as a result of accident misuse or abuse The Licensee assumes all responsibility for selection of the Software to achieve Licensee s intended results and for the installation use and results obtained from the Software Bay Networks does not warrant a that the functions contained in the software will meet the Licensee s requirements b that the Software will operate in the hardware or software combinations that the Licensee may select c that the operation of the Software will be uninterrupted or error free or d that all defects in the operation of the Software will be corrected Bay Networks is not obligated to remedy any Software defect that cannot be reproduced with the latest Software release These warranties do not apply to the Software if it has been i altered except by Bay Networks or in accordance with its instructions ii used in conjunction with another vendor s product resulting in the defect or iii damaged by improper environment abuse misuse accident or negligence THE FOREGOING WARRANTIES AND LIMITATIONS ARE EXCLUSIVE REMEDIES AND ARE IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE Licensee is responsible for the security of 117352 C Rev 00 iii its own data and information and for maintaining adequate procedures apart from the Software to reconstruct lo
4. WCP line A 3 compression modes choosing 3 5 Compression Protocol parameter A 12 compression protocol selecting 3 12 compression See data compression configuration windows accessing 3 2 contexts for hardware compression 2 6 control protocol selecting 3 12 customer support programs xvi Technical Solutions Centers xvii D data compression accessing configuration windows 3 2 allocating memory 3 5 architecture 2 3 configuring hardware 1 8 configuring software 1 6 customizing the configuration 3 1 deleting from a router 3 14 117352 C Rev 00 Index disabling 3 13 features 1 2 maximizing performance 2 5 3 6 modes 3 5 modifying compression protocol 3 12 modifying control protocol 3 12 overview 2 1 starting 1 1 data loss preventing 3 9 daughterboards for hardware compression 2 6 deleting compression 3 14 dial backup frame relay 2 14 PPP 2 13 dial on demand frame relay 2 14 PPP 2 13 E Enable parameter Hi fn LZS A 9 Enable parameter WCP circuit A 7 Enable parameter WCP line A 2 Engine Type parameter Hi fn LZS A 10 Engine Type parameter WCP circuit A 9 Engine Type parameter WCP line A 5 engines for hardware compression 3 10 F Fallback Compression Mode parameter Hi fn LZS A 10 Fallback Compression Mode parameter WCP line A 6 Index 1 fallback compression mode choosing 3 11 frame relay data compression features 2 14 preventing data loss 3
5. complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window click on an empty slot and choose one of the following net modules for hardware compression AF2104007 AF2104012 Site Manager selects the net module Click on OK You return to the Configuration Manager window The net module is added to the slot Click on the slot that contains the hardware compression module and choose a WAN net module Site Manager selects the WAN net module Click on OK You return to the Configuration Manager window The WAN net module is placed over the compression module 5 Choose a port The Add Circuit window opens 6 Accept the default circuit name or enter a new name then click on OK The WAN Protocols window opens Choose one of these WAN protocols PPP Frame Relay Site Manager selects the protocol continued 117352 C Rev 00 For More Starting Compression Site Manager Procedure continued You do this System responds 8 Click on OK The Select Protocols window opens 9 Choose WCP Site Manager enables compression on this interface 10 Click on OK You return to the Configuration Manager window If you have a hardware compression net module on an ASN you can use hardware compression on any WAN port on that single router or slot Hardware c
6. e 64 KB for a lookup table e 32 KB for decompression Hardware compression has similar requirements Selecting 32K for PPP WCP should not be a problem for the BN because PPP allows only one circuit per line Select 8K or 32K for frame relay and X 25 lines depending on the resources of your network Selecting 32K for PPP WCP on the ASN can cause problems particularly if you are using a 32 context compression net module In general 8 KB histories are appropriate for WAN links that run at speeds of 64 Kb s or less because less throughput is required Use an 8 KB history size with frame relay and X 25 which have large numbers of VCs and may have low available bandwidth and with PPP on a 32 context net module You may want to allocate a 32 KB history size for links with speeds higher than 64 Kb s to improve throughput The compression engine can find a data pattern match up to three times faster using a 32 KB history If you select different history sizes for each side of a link the smaller of the two becomes the effective history size Select either 32K or 8K 1 3 6 1 4 1 18 3 4 22 1 1 6 A 4 117352 C Rev 00 Parameter Path Default Options Function Instructions MIB Object ID Data Compression Parameters Buffer Size Configuration Manager gt Protocols gt WCP gt Lines Normal Very Large Large Normal None Indicates the amount of buffer memory for the transmission history on a line Set this p
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9. you should select CPC the default value to maximize compression e Packet by packet compression PPC creates a new history for each packet PPC yields a lower compression ratio than CPC Select PPC only for links that drop a very large number of packets Be aware that under these circumstances implementing data compression may offer little or no advantage If either side of the link specifies PPC both sides of the link must use PPC 117352 C Rev 00 3 5 Configuring Data Compression Services Modifying the Compression Mode To specify the mode that the router uses to compress data modify the Compression Mode parameter To modify this parameter for the line access the WCP Line Interfaces List window To modify this parameter for a circuit access the WCP Circuit Interfaces List window For instructions on accessing configuration windows see Accessing Configuration Windows on page 3 2 For parameter descriptions see Appendix A Data Compression Parameters Maximizing Throughput Each side of the link has both a compression and decompression history and a lookup table The compression and decompression histories maintain a record of data that has already traveled across the network The lookup tables maintain pointers to redundant strings and the offset and length tokens that replace each of those strings You can specify either 8 KB or 32 KB of local memory to maintain a compression history When you ma
10. 4 1 18 3 4 22 5 1 8 A 10 117352 C Rev 00 Data Compression Parameters PPP Interface Parameters for Compression The PPP Interface List window contains two parameters for data compression For more information about PPP see Configuring PPP Services The PPP parameters for compression are as follows Parameter CCP Type Path Configuration Manager gt Protocols gt PPP gt Interfaces Default CCP Options ILCCP CCP Function Specifies the compression control protocol the router uses for this interface Instructions Accept the default CCP if you select Hi fn LZS as the compression protocol or if you select WCP as the compression protocol and you set the PPP Mode parameter to multilink Using CCP as the compression type means that the router negotiates compression above the multilink bundle Select ILCCP if you are configuring a new circuit and you set the PPP Mode parameter to multilink and the remote router is using router software earlier than Version 12 10 Using ILCCP as the compression type means that the router negotiates compression below the multilink bundle If you have a router running BayRS Version 12 10 or later using an older configuration file the routers negotiate WCP below the multilink bundle by default You can change this to CCP for the routers at both ends of the link to negotiate WCP above the multilink bundle MIB Object ID 1 3 6 1 4 1 18 3 5 9 2 2 1 71 117352 C Rev 00 A 11 Configur
11. 9 H hardware compression configuring 1 8 contexts 2 6 daughterboards and net modules 2 5 history size 3 7 selecting engines 3 10 Hi fn LZS compression negotiations 2 10 deleting from a router 3 14 description 2 4 disabling 3 13 features 1 2 Hi fn LZS interface parameters A 9 history buffer 2 3 History Size parameter WCP circuit A 8 History Size parameter WCP line A 4 history size modifying 3 6 L Lempel Ziv LZ 77 algorithm 2 3 line interface parameters A 2 Max Window Size parameter X 25 2 16 multiline PPP 2 11 multilink PPP 2 12 N net modules for hardware compression 2 6 Network Control Protocol NCP negotiations 2 11 Index 2 P parameters circuit interface A 7 Hi fn LZS A 9 line interface A 2 PPP compression parameters 3 12 A 11 data compression features 2 11 preventing data loss 3 9 S software compression configuring 1 6 deleting 3 14 description 2 4 disabling 3 13 modifying compression protocol 3 12 modifying control protocol 3 12 T Technical Solutions Centers xvii throughput description 2 5 maximizing 3 6 Ww WCP allocating memory 3 5 compression negotiations 2 10 definition 2 4 deleting from a router 3 14 disabling 3 13 features 1 2 initialization 2 9 overview 1 2 2 1 X X 25 data compression features 2 15 Max Window Size parameter 2 16 117352 C Rev 00
12. Control Protocol CCP Bay Networks uses RFC 1962 the Compression Control Protocol CCP to enable or disable compression across a PPP link and determine what kind of compression is used CCP also includes a history reset request and acknowledgment capability which Hi fn LZS uses but WCP does not WCP uses its own negotiation mechanism Bay Networks WAN Compression Protocol WCP Bay Networks proprietary WAN Compression Protocol WCP is an IETF draft standard WCP enables compression for frame relay and for X 25 and transports compressed packets for PPP frame relay and X 25 WCP negotiates compression mode history size and buffer size For PPP and frame relay WCP also retransmits packets in the event of packet loss and protects against inadvertent data expansion LAPB retransmits packets for X 25 WCP is most effective for sites that have WAN connections operating at relatively low speeds such as 56 64 KB where you want to achieve data compression at low cost and with minimal memory requirements WCP supports connections up to 512 KB s on the FRE 040 For networks operating at faster speeds you should use hardware compression 2 4 117352 C Rev 00 Data Compression Overview PPP Hi fn LZS Compression Protocol PPP uses CCP to negotiate how the router uses the Hi fn LZS Compression Protocol RFC 1974 Specifically CCP negotiates the different compression modes that RFC 1974 supports Bay Networks negotiates only mode 3
13. Data Compression Bay Networks offers two software compression protocols e WAN Compression Protocol WCP for Point to Point Protocol PPP frame relay and X 25 links e Hi fn LZS for PPP links only Note The Hi fn LZS compression option is not included with your initial purchase of BayRS Bay Networks Hi fn LZS compression software incorporates LZS licensed from Hi fn and therefore must be purchased separately To run Hi fn LZS compression on a PPP link between a Bay Networks router and a non Bay Networks router you must obtain a license for the Hi fn LZS compression software which is delivered on a separate CD These two protocols use different Lev Zimpel algorithms to implement compression and provide different levels of interoperability between Bay Networks routers and routers made by other vendors If both ends of the connection are Bay Networks routers use WCP as the compression protocol If the connection is a PPP link and only one end of the connection is a Bay Networks router use Hi fn LZS Software based data compression works over WAN links Specifically WCP works with PPP frame relay and X 25 links Hi fn LZS works only with PPP links Both WCP and Hi fn LZS work with PPP multilink WCP also works with PPP multiline Software compression includes the following features e Support for all Bay Networks platforms BayStack Access Node AN Access Stack Node ASN Advanced Remote Node
14. Line Interface Parameters The WCP Line Interfaces List window Figure 3 1 contains all data compression line parameters Line 203108 Slot 3 COMS Eons Line 204101 Slot 4 COM1 Apply Line 205103 Slot 5 COM3 Values Help my Enable ENABLE Compression Mode CONTINUOUS PACKET History Size 32K Buffer Size NORMAL Engine Type HARDWARE Fallback Compression Mode SOFTWARE CPC Figure 3 1 WCP Line Interfaces List Window 3 2 117352 C Rev 00 Customizing Data Compression To access this window complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose WCP The WCP menu opens 3 Choose Lines The WCP Line Interfaces List window opens WCP Circuit Interface Parameters The WCP Circuit Interfaces List window Figure 3 2 contains the data compression circuit parameters Done 553 xvc4 1 204101 0 105 1 104 Delete 538 Apply Values Help el Enable ENABLE Compression Mode INHERIT FROM LINE History Size INHERIT FROM LINE Engine Type INHERIT FROM LINE Figure 3 2 WCP Circuit Interfaces List Window 117352 C Rev 00 3 3 Configuring Data Compression Services To access this window complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu open
15. compression for a BN that has an octal synchronous link module with a hardware compression daughterboard complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window the following octal synchronous link modules with a hardware compression daughterboard AG2104037 AG2104038 click on an empty slot and choose one of Site Manager selects the module 2 Click on OK You return to the Configuration Manager window The link module is added to the slot 3 Choose a port The Add Circuit window opens new name then click on OK 4 Accept the default circuit name or enter a The WAN Protocols window opens 5 Choose one of these WAN protocols PPP Frame Relay Site Manager selects the protocol 6 Click on OK The Select Protocols window opens continued 117352 C Rev 00 1 9 Configuring Data Compression Services Site Manager Procedure continued You do this System responds 7 Choose WCP Site Manager enables compression on this interface 8 Click on OK You return to the Configuration Manager window If you have a hardware compression link module on a BN you can use hardware compression on any WAN port on a slot Hardware compression on the BN does not work across slots Configuring Compression for an ASN To configure hardware compression for the ASN
16. responds The Add Circuit window opens 2 Accept the default circuit name or rename The WAN Protocols window opens the circuit then click on OK 3 Choose one of these WAN protocols Site Manager enables the protocol PPP Frame Relay 4 Click on OK The Select Protocols window opens Enable data compression as follows Site Manager enables compression on For frame relay choose WCP this interface For PPP choose WOP if connecting to another Bay Networks router Otherwise choose Hi fn LZS 6 Click on OK You return to the Configuration Manager window 1 6 117352 C Rev 00 Enabling Compression for X 25 Starting Compression To enable WCP on an X 25 interface you must first add an X 25 service record then enable compression for the X 25 interface See Configuring X 25 Services for information about X 25 service records To enable compression complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window click on the link or net module connector for which you are enabling data compression The Add Circuit window opens Accept the default circuit name or rename the circuit then click on OK The WAN Protocols window opens Choose X 25 and click on OK The X 25 Packet Configuration window opens 4 Enter the required information then click on OK The X 25 Service Configurat
17. the router to negotiate which protocol to use To modify these parameters complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose PPP The PPP menu opens 3 Choose Interfaces The PPP Interface List window opens 4 Set the CCP Type parameter Click on Site Manager changes the parameter Help or see the parameter description on value page A 11 continued 3 12 117352 C Rev 00 Customizing Data Compression Site Manager Procedure continued You do this System responds 5 Set the Compression Protocol Site Manager changes the parameter parameter Click on Help or see the value parameter description on page A 12 6 Click on Done You return to the Configuration Manager window Disabling Compression You may want to temporarily disable compression on a line or circuit then reenable it later Disabling WCP To disable WCP modify the Enable parameter To modify this parameter for a line access the WCP Line Interfaces List window To modify this parameter for a circuit access the WCP Circuit Interfaces List window For instructions on accessing configuration windows see Accessing Configuration Windows on page 3 2 For parameter descriptions see Appendix A Data Compression Parameters Disabling Hi fn LZS To disable Hi fn LZS m
18. very high speed links When configuring a Hi fn LZS circuit interface the options are as follows e Software CPC a good choice for lower speed links 64 Kb s or less e None a good choice for extremely high speed links greater than 2 5 Mb s 117352 C Rev 00 3 11 Configuring Data Compression Services Modifying the Fallback Compression Mode To specify the fallback compression mode modify the Fallback Compression Mode parameter To modify this parameter for a WCP line interface access the WCP Line Interfaces List window To modify this parameter for a Hi fn LZS interface access the Hi fn LZS Interface List window For instructions on accessing configuration windows see Accessing Configuration Windows on page 3 2 For parameter descriptions see Appendix A Data Compression Parameters Changing the Compression Control Protocol There are two PPP interface parameters that you can modify for compression CCP Type and Compression Protocol These parameters enable the router to operate with Bay Networks routers using BayRS router software earlier than Version 12 10 and with non Bay Networks routers Modifying the CCP Type parameter enables a router operating with Version 12 10 and later software to be compatible with routers running previous versions of software that negotiate WCP below the PPP multilink bundle Modifying the Compression Protocol parameter lets you specify a particular protocol to use or instructs
19. 11 117352 C Rev 00 Data Compression Overview PPP Bandwidth on Demand Bandwidth on demand allows a secondary dial up line to augment a primary leased line when the primary line experiences congestion Congestion occurs when traffic volume exceeds line capacity When congestion abates the secondary line becomes inactive If you configure bandwidth on demand and WCF it affects the bandwidth on demand congestion thresholds These thresholds instruct the router to activate additional links from a multilink bundle to relieve congestion For BayRS Version 12 10 and later when WCP is negotiated above the multilink bundle and the router sends or receives data it calculates the congestion thresholds based on compressed data If WCP is negotiated below the bundle the router calculates these thresholds based on uncompressed data If a router using BayRS Version 12 10 or later is communicating with a router using software earlier than Version 12 10 the routers must negotiate WCP below the bundle so the thresholds will be based on uncompressed data To configure these thresholds see Configuring Dial Services PPP Dial on Demand Dial on demand service enables you to establish a circuit only when you want to transmit and receive data as opposed to having a leased line which is always available By using a circuit on a demand basis you can significantly reduce your line costs PPP Dial Backup PPP also allows you to configure dia
20. 32 context 31 0 1 128 context 127 0 1 256 context advanced 255 0 1 compression coprocessor daughterboard Table 3 3 shows the maximum number of 32 KB contexts each daughterboard or net module can support Table 3 3 Hardware Compression 32 KB Contexts Maximum 32 KB Available 8 KB Reserved 8 KB Daughterboard or Net Module CPC Contexts CPC Contexts PPC Context 32 context 7 3 1 128 context 31 3 1 256 context advanced 63 3 1 compression coprocessor daughterboard You can combine 8 KB and 32 KB contexts on one daughterboard or net module Be aware that if you bring VCs up and down memory may fragment Even though you have 32 KB or more of compression memory available if it is on different pages you will not be able to configure a 32 KB context To solve this problem save your configuration and reset the slot When you reset the slot available compression memory is rearranged to be contiguous If you have available memory you can always add an 8 KB context because 8 KB is the smallest divisible amount of compression memory 3 8 117352 C Rev 00 Customizing Data Compression Modifying the History Size To maximize throughput you can modify the History Size parameter To modify this parameter for the line access the WCP Line Interfaces List window To modify this parameter for a circuit access the WCP Circuit Interfaces List window For instructions on accessing configurat
21. AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE In addition the program and information contained herein are licensed only pursuant to a license agreement that contains restrictions on use and disclosure that may incorporate by reference certain limitations and notices imposed by third parties ji 117352 C Rev 00 Bay Networks Inc Software License Agreement NOTICE Please carefully read this license agreement before copying or using the accompanying software or installing the hardware unit with pre enabled software each of which is referred to as Software in this Agreement BY COPYING OR USING THE SOFTWARE YOU ACCEPT ALL OF THE TERMS AND CONDITIONS OF THIS LICENSE AGREEMENT THE TERMS EXPRESSED IN THIS AGREEMENT ARE THE ONLY TERMS UNDER WHICH BAY NETWORKS WILL PERMIT YOU TO USE THE SOFTWARE If you do not accept these terms and conditions return the product unused and in the original shipping container within 30 days of purchase to obtain a credit for the full purchase price 1 License Grant Bay Networks Inc Bay Networks grants the end user of the Software Licensee a personal nonexclusive nontransferable license a to use the Software either on a single computer or if applicable on a single authorized device identified by host ID for which it was originally acquired b to copy the Software solel
22. Compression Control Protocol Intelligent Link Interface Integrated Services Digital Network ISDN Basic Rate Interface ISDN Primary Rate Interface local area network Link Access Procedure Balanced Link Control Protocol multichannel E1 multichannel T1 Network Control Protocol Public Data Network packet by packet compression Point to Point Protocol permanent virtual circuit Request for Comments terminal adapter virtual circuit wide area network WAN Compression Protocol 117352 C Rev 00 XV Configuring Data Compression Services Bay Networks Technical Publications You can now print technical manuals and release notes free directly from the Internet Go to support baynetworks com library tpubs Find the Bay Networks products for which you need documentation Then locate the specific category and model or version for your hardware or software product Using Adobe Acrobat Reader you can open the manuals and release notes search for the sections you need and print them on most standard printers You can download Acrobat Reader free from the Adobe Systems Web site www adobe com Documentation sets and CDs are available through your local Bay Networks sales office or account representative Bay Networks Customer Service You can purchase a support contract from your Bay Networks distributor or authorized reseller or directly from Bay Networks Services For information about or to purchase a Bay Networks service con
23. Configuring Data Compression Services The type of data compression you configure depends on the upper layer protocol you want to run over the link as follow e Torun frame relay use WCP e Torun PPP use WOP if you are connecting Bay Networks routers Use Hi fn LZS if you are connecting routers of different vendors Previous Hardware Based Data Compression You can continue to use hardware based data compression services provided by releases earlier than BayRS Version 12 20 which were based on e Optional daughterboards for PPP and frame relay networks that use the octal synchronous link module for the BN using FRE 2 processors only Note If a FRE 2 060E is present in the same slot as an octal synchronous hardware compression daughterboard the FRE 2 060E will be used instead of the octal synchronous daughterboard e Optional net modules for PPP and frame relay networks that use the ASN Hardware compression can compress data transmitted over WANs attached to the following net modules dual and quad synchronous MCE1 ISDN PRI MCTI ISDN dual synchronous with ISDN BRI and Quad BRI 1 4 117352 C Rev 00 Starting Compression Preparing a Configuration File for Data Compression To configure data compression you use the Bay Networks Site Manager configuration tool For information about working with configuration files see Configuring and Managing Routers with Site Manager Before starting data compression you must c
24. ENT IS THE ENTIRE AND EXCLUSIVE AGREEMENT BETWEEN BAY NETWORKS AND LICENSEE WHICH SUPERSEDES ALL PRIOR ORAL AND WRITTEN AGREEMENTS AND COMMUNICATIONS BETWEEN THE PARTIES PERTAINING TO THE SUBJECT MATTER OF THIS AGREEMENT NO DIFFERENT OR ADDITIONAL TERMS WILL BE ENFORCEABLE AGAINST BAY NETWORKS UNLESS BAY NETWORKS GIVES ITS EXPRESS WRITTEN CONSENT INCLUDING AN EXPRESS WAIVER OF THE TERMS OF THIS AGREEMENT iv 117352 C Rev 00 Contents About This Guide Eo fe lois e gee eee ee ees et eer nee erent emer ee T ee at er renner ree ere E xiii ONENI caan N ranean xiv PEO TE a A a EE XV Bay Networks Technical PubliCations vcccecsccvseseesscuibccnasetsssinosreschsiusdee leas beinini a xvi Bay Nehworks Customer SMG sssriiascni aon an aei Esie iara xvi Hor Teer HEIP auan nin a aN welndauedyaatne pie eines peor bined xvii Bay Networks Educational Services c ccsccccseeeeeseeeeneeeeees a xvii Chapter 1 Starting Compression Summary of Bay Networks Data Compression Features ccccccccsesseeeeseseteeeeessaeess 1 2 Soitware Based Data ComprassiOl tise cieacstctescssheeveadiinis anana p aa ann aair a 1 2 Hardware Based Data Compression for the BN Platform cccccecseeeeeseeeeees 1 3 Previous Hardware Based Data Compression cccsescceeeceeeeeeeeceeeeeeetaeeeeneees 1 4 Preparing a Configuration File for Data Compression ccccceeceeeeeeeeeeseeteeeeeeeeaeeeeaes 1 5 CONT GUNG Software COMIOF SS SION sis das
25. a and Computer Software clause at DFARS 252 227 7013 Notwithstanding any other license agreement that may pertain to or accompany the delivery of this computer software the rights of the United States Government regarding its use reproduction and disclosure are as set forth in the Commercial Computer Software Restricted Rights clause at FAR 52 227 19 Statement of Conditions In the interest of improving internal design operational function and or reliability Bay Networks Inc reserves the right to make changes to the products described in this document without notice Bay Networks Inc does not assume any liability that may occur due to the use or application of the product s or circuit layout s described herein Portions of the code in this software product may be Copyright 1988 Regents of the University of California All rights reserved Redistribution and use in source and binary forms of such portions are permitted provided that the above copyright notice and this paragraph are duplicated in all such forms and that any documentation advertising materials and other materials related to such distribution and use acknowledge that such portions of the software were developed by the University of California Berkeley The name of the University may not be used to endorse or promote products derived from such portions of the software without specific prior written permission SUCH PORTIONS OF THE SOFTWARE ARE PROVIDED AS IS
26. all not sublicense assign or otherwise disclose to any third party the Software or any information about the operation design performance or implementation of the Software and user manuals that is confidential to Bay Networks and its licensors however Licensee may grant permission to its consultants subcontractors and agents to use the Software at Licensee s facility provided they have agreed to use the Software only in accordance with the terms of this license 3 Limited warranty Bay Networks warrants each item of Software as delivered by Bay Networks and properly installed and operated on Bay Networks hardware or other equipment it is originally licensed for to function substantially as described in its accompanying user manual during its warranty period which begins on the date Software is first shipped to Licensee If any item of Software fails to so function during its warranty period as the sole remedy Bay Networks will at its discretion provide a suitable fix patch or workaround for the problem that may be included in a future Software release Bay Networks further warrants to Licensee that the media on which the Software is provided will be free from defects in materials and workmanship under normal use for a period of 90 days from the date Software is first shipped to Licensee Bay Networks will replace defective media at no charge if it is returned to Bay Networks during the warranty period along with proof of the date of shipment
27. and the number of compression histories of which we support only one history RFC 1974 is specified only as an error detection protocol unlike WCP it does not contain a transmit history Instead it relies on upper layer protocols to retransmit data when errors occur For more information about compression protocol modes refer to RFC 1974 Data Compression Performance The goals in using data compression are to achieve a high compression ratio while maximizing throughput Compression ratio is the size of uncompressed data compared to the size of the same data after it is compressed Throughput refers to the amount of data that goes across the network in a specific amount of time The amount of throughput can indicate the efficiency and speed of the network The compression ratio varies according to the effectiveness of the compression algorithm but also according to the characteristics of the data you are transmitting Data that includes many redundant strings compresses at a high ratio Throughput varies according to the number of devices in the network through which the data must travel Throughput is also affected by the compression and decompression process Hardware Compression Bay Networks hardware based compression works with frame relay and PPP networks It best serves sites that support T1 or E1 lines which often concentrate many lower speed remote connections The hardware compression facility operates at high speeds and a
28. arameter according to the end to end round trip length of a WCP connection Select Normal for most land line coast to coast connections Select Large or Very Large for connections at a great distance from each other such as satellite connections Select None for links that drop a very small number of packets Increase the buffer size for a link with a large number of resets 1 3 6 1 4 1 18 3 4 22 1 1 7 Because X 25 has features that check for errors and prevent data loss Bay Networks data compression software ignores the Buffer Size parameter for X 25 Parameter Path Default Options Function Instructions MIB Object ID Engine Type Configuration Manager gt Protocols gt WCP gt Lines Software unless you configured either an octal synchronous link module with a hardware compression daughterboard or a FRE 2 060E processor module with an advanced compression coprocessor daughterboard for the BN or a hardware compression net module for the ASN in which case the default is Hardware Software Hardware Specifies whether compression for this node will be software based or hardware based Select Software to use software based compression or select Hardware to use hardware based compression You can use hardware compression with PPP and frame relay only You can use software compression with PPP frame relay or X 25 1 3 6 1 4 1 18 3 4 22 1 1 8 117352 C Rev 00 A 5 Configuring Data Compression Servic
29. arameters Compression Mode Configuration Manager gt Protocols gt WCP gt Lines Continuous Packet Continuous Packet Packet by Packet Specifies the compression mode on the line Continuous packet compression CPC retains compression history across packets and allows a higher compression ratio than packet by packet compression Packet by packet compression PPC resets compression history at the start of each packet resulting in a lower compression ratio Because PPC does not depend on previous packets you should select this option for a link that drops a large number of packets Select either Continuous Packet or Packet by Packet 1 3 6 1 4 1 18 3 4 22 1 1 5 117352 C Rev 00 A 3 Configuring Data Compression Services Parameter Path Default Options Function Instructions MIB Object ID History Size Configuration Manager gt Protocols gt WCP gt Lines 32K 32K 8K Specifies the amount of memory allocated to compression history for the line Remember that history size has separate compression and decompression histories and lookup tables on each side of a link If the link uses software compression with a history of 8 KB each end of the link allocates a total of 32 KB as follows e 8 KB for compression e 16 KB for a lookup table e 8 KB for decompression If the link uses a compression history of 32 KB each end of the link allocates a total of 128 KB as follows e 32 KB for compression
30. cannot control which VCs will use hardware compression By default all VCs that exceed the hardware context limit use software compression For information about customizing CPC and PPC see Chapter 3 Customizing Data Compression Hardware Compression Contexts for Hi fn LZS Hi fn LZS supports a 2 KB history size and CPC contexts only Hi fn LZS does not support PPC contexts 117352 C Rev 00 2 7 Configuring Data Compression Services How Data Compression Works To transmit compressed data the router must complete one or both of the following e CCP negotiations for PPP connections using WCP or Hi fn LZS e WCP negotiations for PPP frame relay and X 25 connections using WCP The following sections describe how these negotiations work As you read these sections see Figure 2 1 which illustrates CCP and WCP initialization on a PPP link If compression is across a frame relay or X 25 link the router negotiates only WCP CCP does not apply 2 8 117352 C Rev 00 Data Compression Overview ELE ELE Router A Router B 1 PPP interface on network LCP negotiations complete begin CCP negotiations Send initialization request gt lt Send initialization request Send initialization ACK Send initialization ACK 2 CCP negotiations complete begin WCP negotiations including compression mode history size and buffer size Send ini
31. configure Read the following sections to learn about how Bay Networks implements data compression for PPP frame relay and X 25 services PPP Services You can use software or hardware data compression on all PPP circuits including multiline and multilink bandwidth on demand dial on demand and dial backup lines When you use compression on a bandwidth on demand dial on demand or dial backup circuit WCP automatically configures or deletes compression as lines are added to or removed from the circuit PPP Multiline Multiline enables you to configure a single circuit consisting of one or more WAN data paths A data path is a logical point to point channel it can be a permanent or dial up physical line or it can be a virtual circuit connection Multiline provides both increased fault tolerance and greater bandwidth between two sites For more information about Bay Networks multiline see Configuring WAN Line Services 117352 C Rev 00 2 11 Configuring Data Compression Services PPP Multilink Multilink provides capabilities beyond those of multiline circuits Multilink consists of a bundle of lines between two peers consisting of up to four links Multilink allows you to e Distribute traffic across the lines in the bundle in amounts roughly proportional to the effective bandwidth of each link e Use lines that have different speeds proportionally distributing traffic over those lines e Balance traffic load and resto
32. dentifiers DLCIs and filters can be the same or different from the primary If the backup uses a unique configuration it is a secondary configuration A secondary configuration uses a different network layer address PVCs and filters from the primary To use data compression with frame relay dial backup you must configure compression on both the primary and the backup circuit The backup circuit does not necessarily inherit the PVC configuration from the primary circuit because the backup PVCs can have different configurations from the primary For more information about Bay Networks dial services see Configuring Dial Services X 25 Services An X 25 network permits as many as 128 VCs to exist on the same physical link at the same time You can configure each of these interfaces individually to use data compression or not X 25 PDN and DDN Services When you use data compression on circuits that you configure for X 25 Public Data Network PDN or Defense Department Network DDN services you must enable compression on both sides of the link If you configure compression on only one side of a PDN or DDN link the data that travels over that link will be corrupted You must also remember to enable the X 25 service record compression parameter for each X 25 interface that you configure For more information about this parameter see Configuring X 25 Services 117352 C Rev 00 2 15 Configuring Data Compression Services Ad
33. eeeeseeeeeeeeeeeeaeseeeeeeseaeeeseneeeeeas 2 6 Hardware Compression Contexts for Hi fn LZS eceeeeesseeeeeeeees reece EE E 2 7 How Data Compression WOKS icsi anaa EA Aa AAE 2 8 Delal Ee D ENa e TAA A E A S 2 10 WCP Negotiations RT S ee a sels ET sine T See 2 10 Daa yee ee Da eee ene ener eae ee rere er ere terry etre erie ry reer rere rer 2 11 Compression Features for Specific Protocols cccccceeceeceeneceeeceeeeeaeeseeeeeeenaeeesenes 2 11 PEF MICOS aeiiae an an socseaieeincsianede lasesetasnne aaees A ENAS 2 11 PEP ORE seira N anata aanaind aati iapitasina maeeuagAtaeuS 2 11 PPP Multilink errr T T ET SaN ates Selmi i 2 12 PPP Banrdwidi on Demand sssrini riaa 2 13 PFP Dalon Donond socrronienni ii i E eer E 2 13 PPP Dial Backup PEPEE UTCAN aoai E eetates PERET 2 13 Pame Pelay SEVES srinasiorii snar E A 2 14 Frame Relay Hybrid ACCESS ons saccurdssscnsasesaiensussaadeiarersanebsnedianssreniaeaatehanniucraais 2 14 Frame Relay Diakon Demand srsnisrisssnansisnaiean 2 14 Famo Roy DAE CUD gaea pedeatnepeeaaeanapeusnuanieenetuae 2 14 X25 SEVICOS sciccicccatccnsscceneenens PEE E errr PE E mee shee ee ra 2 15 K 25 PDN and DON BORA SS asics cetatscaniiee ices canneaciadund ccenmeineaniannterecicaatiniadecenmee 2 15 Adjusting X25 Max Window SIZE sscisceiesiensernsissnarndeiseaserscussaenlnsebharn dion 2 16 Chapter 3 Customizing Data Compression Accessing Cantiouravion Windows eicscscsrsidssantesd
34. eenable WCP 1 3 6 1 4 1 18 3 4 22 2 1 2 Compression Mode Configuration Manager gt Protocols gt WCP gt Interfaces Inherit from Line Continuous Packet Packet by Packet Inherit from Line Specifies the compression mode on the circuit Continuous packet compression CPC retains compression history across packets and allows a higher compression ratio than packet by packet compression PPC Packet by packet compression PPC resets compression history at the start of each packet resulting in a lower compression ratio Because PPC does not depend on previous packets you should select this option for a link that drops a large number of packets Inherit from Line allows you to set WCP parameters at the line level and apply them to circuits For PPP with only one circuit per line this means that you can configure WCP at either the circuit level or the line level Select Inherit from Line if you want to accept the value in effect for the WCP Compression Mode line parameter Otherwise select either Continuous Packet or Packet by Packet 1 3 6 1 4 1 18 3 4 22 2 1 4 117352 C Rev 00 A 7 Configuring Data Compression Services Parameter Path Default Options Function Instructions MIB Object ID History Size Configuration Manager gt Protocols gt WCP gt Interfaces Inherit from Line 32K 8K Inherit from Line Specifies the amount of memory allocated to compression history for the line Rememb
35. elect Hi fn LZS as the compression protocol If you want to temporarily disable Hi fn LZS rather than delete it from the router set this parameter to Disable To reenable Hi fn LZS reset it to Enable 1 3 6 1 4 1 18 3 4 22 5 1 2 117352 C Rev 00 A 9 Configuring Data Compression Services Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Options Function Instructions MIB Object ID Engine Type Configuration Manager gt Protocols gt Hi fn LZS gt Interfaces Software Software Hardware Specifies whether data will be compressed by software or hardware For hardware compression set this parameter to Hardware For software compression set this parameter to Software 1 3 6 1 4 1 18 3 4 22 5 1 4 Fallback Compression Mode Configuration Manager gt Protocols gt Hi fn LZS gt Interfaces Software CPC Software CPC None When a circuit on this line cannot register for hardware compression due to a lack of hardware context memory this parameter determines whether data will be compressed by software or remain uncompressed If you want data to be compressed by software on a circuit that cannot register for hardware compression set this parameter to Software CPC If you want data to remain uncompressed on a circuit that cannot register for hardware compression set this parameter to None None is a good choice for very high speed links 1 3 6 1
36. er that history size has separate compression and decompression histories and lookup tables on each side of a link If the link uses a compression history of 8 KB each end of the link allocates a total of 32 KB as follows e 8 KB for compression e 16 KB for a lookup table e 8 KB for decompression If the link uses a compression history of 32 KB each end of the link allocates a total of 128 KB as follows e 32 KB for compression e 64 KB for a lookup table e 32 KB for decompression Hardware compression has similar requirements Selecting 32K for PPP WCP should not be a problem for the BN because PPP allows only one circuit per line Select 8K or 32K for frame relay and X 25 lines depending on the resources of your network Selecting 32K for PPP WCP on the ASN can cause problems particularly if you are using a 32 context compression net module In general 8 KB histories are appropriate for WAN links that run at speeds of 64 Kb s or less because less throughput is required Use an 8KB history size with frame relay and X 25 which have large numbers of VCs and may have low available bandwidth and with PPP on a 32 context net module You may want to allocate a 32 KB history size for links with speeds higher than 64 Kb s to improve throughput The compression engine can find a data pattern match up to three times faster using a 32 KB history If you select different history sizes for each side of a link the smaller of the two becomes the e
37. es Parameter Path Default Options Function Instructions MIB Object ID Fallback Compression Mode Configuration Manager gt Protocols gt WCP gt Lines Software CPC Software CPC Hardware PPC None For hardware compression only specifies the compression mode you want to use when no hardware compression contexts are available Software CPC is a good choice for lower speed links 64 Kb s or less It generally affords a better compression ratio than Hardware PPC Hardware PPC is a good choice for higher speed links greater than 64 Kb s It provides better throughput than Software CPC None is a good choice for very high speed links Select Software CPC Hardware PPC or None 1 3 6 1 4 1 18 3 4 22 1 1 10 A 6 117352 C Rev 00 Data Compression Parameters WCP Circuit Interface Parameters Parameter Path Default Options Function Instructions MIB Object ID Parameter Path Default Options Function Instructions MIB Object ID Use the following descriptions to set WCP circuit interface parameters Enable Configuration Manager gt Protocols gt WCP gt Interfaces Enable Enable Disable Enables or disables data compression on the circuit WCP automatically sets this parameter to Enable when you select WCP in the Select Protocols window If you want to temporarily disable WCP rather than delete it from the router set this parameter to Disable Reset it to Enable to r
38. ext that you need to enter command names and buttons in menu paths Example Enter wism amp Example Use the dinfo command Example ATM DXI gt Interfaces gt PVCs identifies the PVCs button in the window that appears when you select the Interfaces option from the ATM DXI menu Indicates variable values in command syntax descriptions new terms file and directory names and book titles Indicate the title of a chapter or section within a book Indicates data that appears on the screen Example Set Bay Networks Trap Monitor Filters Separates menu and option names in instructions and internal pin to pin wire connections Example Protocols gt AppleTalk identifies the AppleTalk option in the Protocols menu Example Pin 7 gt 19 gt 20 Indicates that you enter only one of the parts of the command The vertical line separates choices Do not type the vertical line when entering the command Example If the command syntax is show at routes nets you enter either show at routes or show at nets but not both xiv 117352 C Rev 00 Acronyms ACK CCP CPC DDN DLCI DTR IETF ILCCP ILI ISDN ISDN BRI ISDN PRI LAN LAPB LCP MCE1 MCTI1 NCP PDN PPC PPP PVC RFC TA VC WAN WCP About This Guide acknowledgment Compression Control Protocol continuous packet compression Defense Data Network data link connection identifier data terminal ready Internet Engineering Task Force Individual Link
39. exts auec ae 3 8 Table 3 3 Hardware Compression 32 KB Contexts ccccceeseeeeeeeeteeeeeeesaeeeeaes 3 8 Table 3 4 Default Compression Type Dependencies ccccescetceesteeteteeeees 3 10 117352 C Rev 00 xi About This Guide If you are responsible for configuring data compression you need to read this guide If you want to Go to Start compression Chapter 1 Learn about data compression services Chapter 2 Change default settings for compression parameters Chapter 3 Obtain information about Site Manager parameters this is the same Appendix A information you obtain using Site Manager online Help Before You Begin Before using this guide you must complete the following procedures For a new router e Install the router refer to the installation guide that came with your router e Connect the router to the network and create a configuration file refer to Quick Starting Routers Configuring BayStack Remote Access or Connecting ASN Routers to a Network Make sure that you are running the latest version of BayRS and Site Manager software For instructions see Upgrading Routers from Version 7 11 xx to Version 12 00 and the BayRS Version 12 20 Document Change Notice 117352 C Rev 00 xiii Configuring Data Compression Services Conventions bold text italic text quotation marks screen text separator gt vertical line I Indicates t
40. f 8 KB per context although you can configure history size to either 8 KB or 32 KB For example if you configure history size at 32 KB you use four 8 KB contexts and you have that many fewer contexts available to run hardware compression on your network Note Although software compression does not place strict limits on the number of contexts you can configure be aware that memory requirements for history size are the same for both software and hardware compression Compression daughterboards reserve one 8 KB context for PPC as opposed to CPC There is no limit to the number of VCs that can use this one PPC context The maximum number of VCs for the compression engine is 256 The compression hardware uses memory in units called pages where a page equals 32 KB of memory Each context that uses a 32 KB history uses one page of memory Restrictions for CPC contexts using either 8 or 32 KB histories are that the memory used for any one history must be continuous and that it may not cross pages For 8 KB contexts these restrictions create few constraints but for 32 KB contexts they are significant 117352 C Rev 00 3 7 Configuring Data Compression Services Table 3 2 shows the maximum number of 8 KB contexts each daughterboard or net module can support Table 3 2 Hardware Compression 8 KB Contexts Maximum 8 KB Available 32 KB Reserved 8 KB Da ghteiboard or Net Module CPC Contexts CPC Contexts PPC Contexts
41. ffective history size Inherit from Line allows you to set WCP parameters at the line level and apply them to circuits Select Inherit from Line if you want to accept the value in effect for the WCP History Size line parameter Otherwise select either 32K or 8K 1 3 6 1 4 1 18 3 4 22 2 1 5 A 8 117352 C Rev 00 Parameter Path Default Options Function Instructions MIB Object ID Data Compression Parameters Engine Type Configuration Manager gt Protocols gt WCP gt Interfaces Inherit from Line Software Hardware Inherit from Line Specifies whether compression for this node will be software based or hardware based Select Inherit from Line if you want to accept the value in effect for the WCP Engine Type line parameter Otherwise select Software to use software based compression or Hardware to use hardware based compression You can use hardware compression with PPP and frame relay only You can use software compression with PPP frame relay or X 25 1 3 6 1 4 1 18 3 4 22 2 1 6 Hi fn LZS Interface Parameters Parameter Path Default Options Function Instructions MIB Object ID Use the following descriptions to set Hi fn LZS compression parameters Enable Configuration Manager gt Protocols gt Hi fn LZS gt Interfaces Enable Enable Disable Enables or disables Hi fn LZS compression on this interface Site Manager automatically sets this parameter to Enable when you s
42. fy software compression for VCs in excess of the number of contexts your hardware compression daughterboard or net module can support Configure a VC to use software compression by setting the Engine Type parameter to Software Selecting Compression Engines To specify the compression type for this router modify the Engine Type parameter To modify this parameter for the line access the WCP Line Interfaces List window To modify this parameter for a circuit access the WCP Circuit Interfaces List window To modify this parameter for a circuit configured for Hi fn LZS compression access the Hi fn LZS Interface List window For instructions on accessing configuration windows see Accessing Configuration Windows on page 3 2 For parameter descriptions see Appendix A Data Compression Parameters Selecting a Fallback Compression Mode You can set a fallback compression mode when configuring a WCP line interface or a Hi fn LZS interface The fallback compression mode indicates the compression mode that you want to use when no hardware compression contexts are available When configuring a WCP line interface the options are as follows e Software CPC a good choice for lower speed links 64 Kb s or less It generally affords a better compression ratio than Hardware PPC e Hardware PPC a good choice for higher speed links greater than 64 Kb s It provides better throughput than Software CPC e None a good choice for
43. g information Parameter name Configuration Manager menu path Default setting Valid parameter options Parameter function Instructions for setting the parameter Management information base MIB object ID 117352 C Rev 00 A 1 Configuring Data Compression Services The Technician Interface allows you to modify parameters by issuing set and commit commands with the MIB object ID This process is equivalent to modifying parameters using Site Manager For more information about using the Technician Interface to access the MIB see Using Technician Interface Software Caution The Technician Interface does not verify the validity of your parameter values Entering an invalid value can corrupt your configuration WCP Line Interface Parameters Use the following descriptions to set data compression line parameters Parameter Enable Path Configuration Manager gt Protocols gt WCP gt Lines Default Enable Options Enable Disable Function Enables or disables data compression on the line Instructions WCP automatically sets this parameter to Enable when you select WCP in the Select Protocols window If you want to temporarily disable WCP rather than delete it from the router set this parameter to Disable To reenable WCP reset it to Enable MIB Object ID 1 3 6 1 4 1 18 3 4 22 1 1 2 A 2 117352 C Rev 00 Parameter Path Default Options Function Instructions MIB Object ID Data Compression P
44. ial services Frame relay compression works on multiline and dial backup lines Hardware based compression for PPP and frame relay networks for BN routers using one of the following modules Octal synchronous link module using FRE 2 processors FRE 2 060E processor module with the advanced compression coprocessor daughterboard to which you can connect a broad range of Bay Networks link modules see Hardware Based Data Compression for the BN Platform on page 1 3 for the list of supported link modules Hardware compression on the BN supports all PPP and frame relay services that WCP software compression supports Hardware based compression for PPP and frame relay networks for the ASN router A compression net module compresses data transmitted over a WAN network by dual and quad synchronous MCE1 ISDN PRI MCTI ISDN dual synchronous with ISDN BRI and Quad BRI net modules Hardware compression on the ASN supports all PPP services that WCP software compression supports Bay Networks WCP software and hardware based compression interoperate fully because they use the same algorithm Hi fn LZS hardware compression is supported by the FRE 2 060E processor with the advanced compression coprocessor daughterboard for the BN when connecting to a router from another vendor that is also running the Hi fn LZS algorithm To use software data compression effectively you must decide how to allocate memory for this task The goal is to com
45. igure hardware compression for a BN that has a FRE 2 060E processor module with advanced compression coprocessor daughterboard complete the following tasks Site Manager Procedure You do this 1 In the Configuration Manager window click on the slot in which the FRE 2 060E processor module with advanced compression coprocessor is installed and choose the link module for which you want to enable data compression System responds Site Manager selects the module Click on OK You return to the Configuration Manager window The link module is added to the slot 3 Choose a port The Add Circuit window opens 4 Accept the default circuit name or enter a new name then click on OK The WAN Protocols window opens 5 Choose one of these WAN protocols Site Manager selects the protocol PPP Frame Relay 6 Click on OK The Select Protocols window opens continued 117352 C Rev 00 Starting Compression Site Manager Procedure continued You do this 7 Enable data compression as follows For frame relay choose WCP For PPP choose WOP if connecting to another Bay Networks router Otherwise choose Hi fn LZS 8 Click on OK System responds Site Manager enables compression on this interface You return to the Configuration Manager window Configuring Compression for a BN Octal Synchronous Link Module To configure hardware
46. ing Data Compression Services Parameter Compression Protocol Path Configuration Manager gt Protocols gt PPP gt Interfaces Default Any Options Any WCP Hi fn LZS Function Specifies the compression protocol the router uses for this interface Instructions Accept the default Any if you want the router to automatically select the compression protocol that is compatible with the remote router as follows e If the remote router can use either WCP or Hi fn LZS the router selects WCP for example if both ends of the connection are Bay Networks routers e If the remote router does not use WCP but uses Hi fn LZS the router selects Hi fn LZS Conversely if the remote router does not use Hi fn LZS but uses WCEP the router selects WCP If the remote router does not recognize either WCP or Hi fn LZS then CCP does not complete negotiations and the router will not compress data Select WCP as the compression protocol if the remote router is a Bay Networks router Select Hi fn LZS as the compression protocol if the remote router is not a Bay Networks router MIB Object ID 1 3 6 1 4 1 18 3 5 9 2 2 1 72 A 12 117352 C Rev 00 bandwidth on demand 2 13 Buffer Size parameter WCP line A 5 C CCP Type parameter A 11 circuit interface parameters A 7 Compression Control Protocol CCP definition 2 4 initialization 2 9 negotiations 2 10 Compression Mode parameter WCP circuit A 7 Compression Mode parameter
47. ion Mode ccsecceceeeeeteeeeeeeeeeesaeeeeenes 3 12 Changing the Compression Control Protocol cccccesceeeeeenceseeeeseeeseeeeeeeeeeeeeeeeees 3 12 Disabling Compression pepe Cee rte E RE ETT EE ET 3 13 SARE saisi nanas A TAA 3 13 AS AI FAL E E E E N A NE A E EN T 3 13 Deleting Data Compression from a ROUTE isuicssiscnsinsrsnsionini arniarna ciiai 3 14 Appendix A Data Compression Parameters WOP Line Interface Parameters mene Core A E ete enue bee aaae 2 WGP Circuit Intenace Parameters sos sssivca sensed tan aN A AAR A 7 PAi LZS UPS Pramea E aiian aaa aA aS A A 9 PPP Interface Parameters for COMPreSSION cccecccceeeeeeeeeeeeeeeeeeeeaeseeeeeesetaeeeeaeeeees A 11 Index 117352 C Rev 00 vii Figures Figure 2 1 CCP and WOP Initialization on a PPP Link eee eeeeee sees eeeeeeeee teeters 2 9 Figure 3 1 WOP Line Interfaces List WiINdOW cceeeeceeeeeeeeereeneeeeeeeeseeeaesereeaeees 3 2 Figure 3 2 WGP Circuit Interfaces List WINKOW snicicccccscsstcnsorscicconiinnntinmrescnnmranes 3 3 Figure 3 3 Hi fn LZS Interface List Window 117352 C Rev 00 ix Tables Table 1 1 Link Modules Supported by FRE 2 060E Processor with Advanced Compression Coprocessor Daughterboard 1 3 Table 2 1 Data Compression Algorithms and Protocols s s 2 3 Table 3 1 Memory Allocation for Software Compression History c0ccecee 3 6 Table 3 2 Hardware Compression 8 KB Cont
48. ion window opens Click on Add The X 25 Service Record window opens Enter the required information then click on OK You return to the X 25 Service Configuration window Choose Protocols The Protocols menu opens Choose Add Delete The Select Protocols window opens Choose WCP Site Manager enables compression on this interface and then returns you to the X 25 Service Configuration window t 1 0 Set the Enable Compression parameter to Enable Do this for each X 25 interface that you configure Site Manager enables compression for this interface 1 1 Click on Done You return to the Configuration Manager window Site Manager requires that you configure certain packet and service parameters See Configuring X 25 Services for information about these parameters t At the time you enable compression you can also enable other protocols 117352 C Rev 00 1 7 Configuring Data Compression Services Configuring Hardware Compression To use hardware compression for the BN router you must have either an octal synchronous link module with a hardware compression daughterboard or the FRE 2 060E processor module with the advanced compression coprocessor daughterboard For the ASN router you must have a hardware compression net module You can use hardware compression with PPP and frame relay Configuring Compression for a BN FRE 2 060E Processor To conf
49. ion windows see Accessing Configuration Windows on page 3 2 For parameter descriptions see Appendix A Data Compression Parameters Preventing Data Loss for PPP and Frame Relay Buffer size is the amount of memory allocated to store the transmission history You must configure this parameter to protect against data loss if you run PPP or frame relay You can use a buffer size of None Normal Large or Very Large The default value is Normal Configure buffer space based on the following conditions e Length of time it takes for data to travel over the link A Normal buffer size is usually large enough for a coast to coast connection within the United States You may need a Large or Very Large buffer if your link is over a satellite connection e Number of dropped packets For a link with a high number of dropped packets increase the buffer size For a link with a very low number of dropped packets decrease the buffer size even to None to conserve memory Number of resets For a link with a high number of resets and a low number of dropped packets increase the buffer size Be aware however that a high number of resets may occur for reasons unrelated to buffer size Note X 25 is a reliable protocol which means that it has features that check for errors and prevent data loss Bay Networks data compression software ignores the Buffer Size parameter for X 25 117352 C Rev 00 3 9 Configuring Data Co
50. is based on a Lempel Ziv LZ 77 algorithm The algorithm uses a sliding history buffer that stores the data that the network link has processed most recently The compressor compares new data strings with data it has already processed and stored in the buffer When the compressor detects data strings that match data it has already processed it replaces those strings with offset and length tokens that are shorter than the original strings thus compressing the data 117352 C Rev 00 2 3 Configuring Data Compression Services Hi fn LZS Algorithm Hi fn is a wholly owned subsidiary of Stac Inc Bay Networks Hi fn LZS compression software incorporates LZS from Hi fn Bay Networks Hi fn LZS compression software is based on the Hi fn LZS algorithm to transport compressed packets across a PPP link Hi fn LZS implements an error detection mechanism which means that it can detect whether packets are lost during transmission Hi fn LZS does not retransmit packets if they are lost The Hi fn LZS compression algorithm searches incoming data for redundant data strings and replaces these strings in the outgoing data with encoded tokens of shorter length Hi fn LZS creates the encoded tokens from information in a table that the Hi fn LZS algorithm builds This table consists of string matches which point to previous incoming data As the table is built and tokens are created subsequent data is compressed based on previous data Compression
51. justing X 25 Max Window Size Window size can affect packet throughput across the X 25 network Setting the X 25 Max Window Size parameter too low can cause the router to drop packets and render data compression ineffective You should configure this parameter at a higher value than the default setting 2 16 117352 C Rev 00 Chapter 3 Customizing Data Compression When you enable data compression default values are in effect for all parameters For WCP and hardware compression you may want to change these values depending on the requirements of your network This chapter provides information about customizing Bay Networks compression to use it most effectively on your network This chapter contains the following information Topic Page Accessing Configuration Windows 3 2 Allocating Compression Memory for WCP 3 5 Configuring Hardware Compression 3 10 Changing the Compression Control Protocol 212 Disabling Compression 3 13 Deleting Data Compression from a Router 14 117352 C Rev 00 3 1 Configuring Data Compression Services Accessing Configuration Windows To customize compression you need to access specific configuration windows that contain the parameters you want to modify Refer to one of the following sections for instructions e WCP Line Interface Parameters e WCP Circuit Interface Parameters on page 3 3 e Hi fn LZS Circuit Interface Parameters on page 3 4 WCP
52. ke this choice be aware that you are allocating more memory than the History Size parameter value indicates Table 3 1 lists the amount of memory required for 8 KB and 32 KB history sizes Table 3 1 Memory Allocation for Software Compression History Memory Requirements 8 KB History Size 32 KB History Size Compression history 8 KB 32 KB Lookup table 16 KB 64 KB Decompression history 8 KB 32 KB Total memory required 32 KB 128 KB If you select different values for history size for the two sides of the link 8 KB becomes the history size for both sides of the link Hardware compression has similar requirements see History Size with Hardware Compression on page 3 7 3 6 117352 C Rev 00 Customizing Data Compression 8 KB History Size In general 8 KB histories are appropriate for frame relay and X 25 when you have large numbers of VCs and need to conserve memory for each of them 32 KB History Size For PPP with only one circuit per line you may want to use a 32 KB history You may also want to allocate a 32 KB history size for links with speeds higher than 64 Kb s to improve throughput The compressor can find a data pattern match up to three times faster using a 32 KB history than an 8 KB history History Size with Hardware Compression Hardware compression daughterboards and net modules are available in 32 128 and 256 contexts The numbers 32 128 and 256 assume a history size o
53. l backup service If a primary PPP line fails and you enabled dial backup the router automatically establishes a backup line You cannot enable any protocols including compression on a backup circuit because a backup circuit inherits its protocols from the primary circuit If the primary circuit uses compression then the backup circuit does also For more information about Bay Networks dial services see Configuring Dial Services 117352 C Rev 00 2 13 Configuring Data Compression Services Frame Relay Services You can use software WCP only or hardware data compression with frame relay You can use compression with some virtual circuits VCs and not with others as you choose both for regular frame relay VCs and for those you configure in hybrid mode You can also use compression with dial on demand and dial backup services You must enable compression on both sides of a frame relay link If you enable data compression on only one side of the link data transmission occurs but in uncompressed form Frame Relay Hybrid Access Hybrid access enables you to combine bridging and routing over a single frame relay interface When you enable data compression for frame relay on a hybrid circuit both the bridged and the routed traffic over that circuit are compressed Note that compression applies only to the hybrid permanent virtual circuit PVC and not to the other PVCs from the main circuit unless you also enabled compressio
54. lso supports high density WAN connections Use hardware compression when you want to achieve high compression ratios and throughput and also want to conserve router memory for other functions 117352 C Rev 00 2 5 Configuring Data Compression Services Hardware Compression for the BN The BN supports the following compression daughterboards e AG2104037 Octal Sync with a 32 contexts hardware compression daughterboard e AG2104038 Octal Sync with a 128 contexts hardware compression daughterboard e Advanced compression coprocessor daughterboard with 128 or 256 contexts installed on the FRE 2 060E processor module Hardware Compression for the ASN The hardware compression net modules for the ASN can compress data transmitted over WAN networks attached to dual and quad synchronous MCEI ISDN PRI MCTI ISDN dual synchronous with ISDN BRI and Quad BRI net modules One compression net module in a single ASN can provide hardware compression for all the net modules on that router It does not provide compression for any other ASN in the stack The compression net module is available in both a 32 contexts and a 128 contexts version The ASN supports the following compression net modules e AF2104007 32 contexts hardware compression net module e AF2104012 128 contexts hardware compression net module Hardware Compression Contexts for WCP A context refers to compression and decompression for a single virtual circuit VC C
55. mpression Services Modifying the Buffer Size To protect against data loss modify the Buffer Size parameter To modify this parameter access the WCP Line Interfaces List window For instructions on accessing configuration windows see Accessing Configuration Windows on page 3 2 For parameter descriptions see Appendix A Data Compression Parameters Configuring Hardware Compression There are issues specific to hardware compression e Selecting a hardware compression engine e Selecting a fallback compression mode These two issues are explained in the next sections Selecting Software or Hardware Compression Engines When you configure a VC for compression the default compression type varies Table 3 4 Table 3 4 Default Compression Type Dependencies Module Type Default Compression Type Link module that does not support Software hardware compression Link module that supports hardware Hardware compression Net module other than compression Software module Net module hardware compression net Hardware module Advanced compression coprocessor Hardware daughterboard 3 10 117352 C Rev 00 Customizing Data Compression You can use software compression even though you are using a hardware compression daughterboard or net module Bay Networks recommends that you use hardware compression for connections operating at speeds greater than 512 Kb s You should also speci
56. n for those interfaces Conversely if you enable data compression for other PVCs but not on a PVC you configured for hybrid mode the hybrid circuit does not use compression Frame Relay Dial on Demand Frame relay enables you to configure dial on demand service Dial on demand enables the router to activate a dial up line only when there is data to send or when you configure the router to force the activation of a dial up line Using frame relay dial on demand ensures that you establish connections only when you need them as opposed to using leased lines which are active regardless of data activity This helps you reduce line costs Frame Relay Dial Backup Frame relay enables you to configure dial backup service If a primary frame relay circuit fails and you enable dial backup the router automatically establishes a backup circuit The backup circuit can be a PPP circuit a frame relay circuit that uses direct mode a service record with only one PVC or a frame relay circuit that uses group mode a service record with two or more PVCs 117352 C Rev 00 Data Compression Overview The backup circuit can inherit the primary circuit s configuration or it can use its own When the frame relay primary and backup use the same configuration they have a shared configuration The backup circuit uses the same network layer address as the primary circuit The data link layer configuration that is the backup PVCs data link connection i
57. nds of a PPP frame relay or X 25 connection to negotiate compression Frame relay and X 25 use WCP to negotiate whether to use data compression and which algorithm to use PPP uses CCP and WCP to negotiate this information As with PPP if one side of a link requests an algorithm that the other side does not support traffic continues but in uncompressed form All three WAN protocols use WCP to negotiate options such as compression mode history size and buffer size Each side of a link running data compression has a compressor a decompressor a compression history and a retransmission buffer You can edit WCP parameters for compression mode history size and buffer size to optimize compression performance on your network see Allocating Compression Memory for WCP on page 3 5 2 10 117352 C Rev 00 Data Compression Overview Data Transmission For PPP links using WCP Network Control Protocol NCP negotiations and WCP negotiations occur simultaneously When PPP NCP and WCP negotiations are complete data transmission using compression begins For PPP links using Hi fn LZS data transmission using compression begins when CCP and NCP negotiations are complete For frame relay and X 25 links data transmission using compression begins when WCP negotiations are complete Compression Features for Specific Protocols Bay Networks data compression services vary in some details according to the WAN protocols that you
58. odify the Enable parameter To modify this parameter access the Hi fn LZS Interface List window For instructions on accessing configuration windows see Accessing Configuration Windows on page 3 2 For parameter descriptions see Appendix A Data Compression Parameters 117352 C Rev 00 3 13 Configuring Data Compression Services Deleting Data Compression from a Router To delete compression from all circuits on the router complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose WCP or Hi fn LZS The WCP or Hi fn LZS menu opens 3 Choose Delete WCP or Delete Hi fn LZS Do you R WCP or Site Manager prompts FALLY want to delete Hi fn LZS 4 Click on OK The Config opens the router uration Manager window Compression is no longer operating on 3 14 117352 C Rev 00 Appendix A Data Compression Parameters This appendix describes the data compression parameters You can display the same information using Site Manager online Help This appendix contains the following information Topic Page WGP Line Interface Parameters A 2 WGP Circuit Interface Parameters A 7 Hi in LZS Interface Parameters A 9 PPP Interface Parameters for Compression A 11 For each parameter this appendix provides the followin
59. ompression hardware maps a context to specific regions of compression and decompression memory e A32 contexts compression daughterboard or net module can run compression simultaneously over 31 continuous packet compression CPC contexts each using an 8 KB history size with one shared 8 KB packet by packet compression PPC context 2 6 117352 C Rev 00 Data Compression Overview e A 128 contexts compression daughterboard or net module can run compression simultaneously over 127 CPC contexts each using an 8 KB history size with one shared 8 KB PPC context e A 256 contexts advanced compression coprocessor daughterboard installed on a FRE 2 060E processor module can run compression simultaneously over 255 CPC contexts each using an 8 KB history size with one shared 8 KB PPC context The 32 contexts 128 contexts and 256 contexts daughterboards and net modules differ in their amount of memory e The 32 contexts daughterboard and net module have 512 KB compression 256 KB decompression e The 128 contexts daughterboards and net module have 2 MB compression 1 MB decompression e The 256 contexts advanced compression coprocessor daughterboard has 4 MB compression 2 MB decompression Note You should plan your network to use hardware compression on the VCs most important to you within the limits of your equipment If you configure more VCs for hardware compression than your daughterboard or net module can support you
60. ompression on the ASN does not work across slots that is it does not provide compression for any other ASNs in the stack nformation For detailed information about Bay Networks data compression see Chapter 2 Data Compression Overview For information and recommendations about using nondefault values to customize compression see Chapter 3 Customizing Data Compression 117352 C Rev 00 Chapter 2 Data Compression Overview Bay Networks data compression services enable you to reduce line costs and improve response times over wide area networks In addition they eliminate redundancies in data streams When you use compression on a network bandwidth efficiency improves so you can transmit more data This chapter contains the following information Topic Page Bay Networks Compression Services 2 2 Data Compression Architecture 2 3 Data Compression Performance 2 5 Hardware Compression 2 5 How Data Compression Works 2 8 Compression Features for Specific Protocols 2 11 117352 C Rev 00 2 1 Configuring Data Compression Services Bay Networks Compression Services Bay Networks compression services include Software based compression for PPP frame relay and X 25 networks for all router platforms and all serial interfaces PPP compression works on multiline multilink on the ISDN BRI and PRI modules and on lines that use Raise DTR or V 25bis modem interfaces with d
61. orsieis cpiniavencianaivaasnindiindcnnnndiaad adds eoenmiecasasiuss te 1 6 Enabling Compression for PPP and Frame Relay muha verre ahora maasto Enabling Compression Or A 2E rania siai N eadvallin blunted uenieadeas 1 7 Configuring Hardware Compression iiccissciecosustesernuniencsasodeout aeai a i 1 8 Configuring Compression for a BN FRE 2 060E Processor ccceseeeseeeee 1 8 Configuring Compression for a BN Octal Synchronous Link Module 05 1 9 Configuring Compression for an ASN ee era Te errr rere E 1 10 ror More MIormalOn sernir a a tcaveaaetanvieliery 1 11 Chapter 2 Data Compression Overview Bay Networks Compression SeniGes seissioun aaraa a raa aiaa 2 2 Data Compression Arc hibee ture sonnin ANE Nd a aa aai 2 3 LZ TT AGONI cecuniini E pahada eiis E E R TT 2 3 117352 C Rev 00 v Hi Lal FOF IIIA aa nti ehekaa eA 2 4 Compression Control Protocol CCP E ee seein neua 2 4 Bay Networks WAN Compression Protocol WOP sssssesssssesssseesssesseerreesreessresens 2 4 PPP Hiin CZS Compression Protocol enisinia aa iaia 2 5 Data Compression Performance s s s UAN P T adas 2 5 Pardwale ONE SION a encrcaimnsdamitis lien A R A 2 5 Hardware Compression TOF the BN seuctcdapsisisdconcesertspdedaeinceradearendanceuhsstaasoertaonnuesad 2 6 Hardware Compression for the ASN scicccisssstesdassctesscetecssescsdstesansdanstenesnnetendacdientes 2 6 Hardware Compression Contexts for WOP cecccccccs
62. press data as much as possible and to transmit the data as quickly as possible without taxing the resources of the router 2 2 117352 C Rev 00 Data Compression Overview Data Compression Architecture WCP and Hi fn LZS use different compression algorithms and protocols The compression protocol that you choose depends on whether you are communicating with routers from Bay Networks or other vendors Table 2 1 lists the algorithms and protocols that Bay Networks uses to provide data compression services for WCP and Hi fn LZS Table 2 1 Data Compression Algorithms and Protocols WCP Hi fn LZS LZ 77 algorithm Hi fn LZS algorithm Compression Control Protocol RFC 1962 Compression Control Protocol RFC 1962 Bay Networks proprietary WAN References the PPP Hi fn LZS Compression Protocol WCP Compression Protocol RFC 1974 asa guideline You must ensure that routers at both ends of the connection are using the same compression protocol e If both ends of the connection are Bay Networks routers configure both routers to use WCP as the compression protocol e Ifthe connection is a PPP link and only one end of the connection is a Bay Networks router configure both routers to use Hi fn LZS If you want the router to negotiate which protocol is used set the Compression Protocol parameter to Any see page A 12 for the parameter description LZ 77 Algorithm Bay Networks WCP data compression software
63. re packet sequence e Use switched lines such as ISDN B channels as well as leased lines e Monitor traffic volume Depending on the version of BayRS the router handles the operation of PPP multilink and WCP differently For BayRS Version 12 10 and later by default the router negotiates WCP above the PPP multilink bundle for new circuits only Negotiating compression above the bundle means that data packets are first compressed and then distributed across the links in the bundle The distribution of traffic occurs once for the entire bundle so the balance of traffic across the bundle is more accurate In addition the router uses less memory for compression Routers using BayRS Version 12 10 or later with an older configuration file negotiate WCP below the multilink bundle by default Negotiating compression below the bundle means that data packets are first distributed across the links and then compressed Compression is done individually for every link You can reconfigure the circuit to negotiate WCP above the bundle by changing the CCP Type parameter to CCP on the routers at both ends of the link If you configure a new multilink circuit on a local router running BayRS Version 12 10 or later and the remote router is running a version earlier than 12 10 you must change the CCP Type parameter from the default CCP to ILCCP for the local router and set the PPP Mode to multilink For a description of the CCP Type parameter see page A
64. reate and save a configuration file with at least one unconfigured WAN interface such as a synchronous or MCT1 port To configure this interface for compression complete the following tasks Site Manager Procedure You do this System responds 1 In the main Site Manager window choose Tools The Tools menu opens 2 Choose Configuration Manager The Configuration Manager menu opens 3 Choose Local File Remote File or Site Manager prompts you for the Dynamic configuration file you want to open 4 Select the file The Configuration Manager window opens displaying the router modules From the Configuration Manager window proceed to the following sections to configure a WAN protocol and compression 117352 C Rev 00 1 5 Configuring Data Compression Services Configuring Software Compression Software compression works on all router platforms and all serial interfaces After you open a configuration file go to one of the following sections to enable compression Enabling Compression for PPP and Frame Relay Enabling Compression for X 25 on page 1 7 Enabling Compression for PPP and Frame Relay To configure software compression on a PPP or frame relay interface complete the following tasks Site Manager Procedure You do this 1 In the Configuration Manager window click on the link or net module connector for which you are enabling data compression System
65. s choose Protocols 2 Choose WCP The WCP menu opens 3 Choose Interfaces The WCP Circuit Interfaces List window opens Hi fn LZS Circuit Interface Parameters The Hi fn LZS Interface List window Figure 3 3 contains Hi fn LZS interface parameters Done Delete Apply Values Help nk _ A Enable ENABLE Engine Type SOFTWARE Fallback Compression Mode SOFTWARE CPC Figure 3 3 Hi fn LZS Interface List Window 3 4 117352 C Rev 00 Customizing Data Compression To access this window complete the following tasks Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose Hi fn LZS The Hi fn LZS menu opens 3 Choose Interfaces The Hi fn LZS Interface List window opens Allocating Compression Memory for WCP Maximizing Using WCP across a network involves allocating memory to maximize compression without taxing the resources of your router To achieve this goal you can customize the following compression parameters e Compression mode to maximize the compression ratio e History size to maximize throughput e Buffer size to prevent data loss the Compression Ratio You can compress data in one of two modes e Continuous packet compression CPC maintains compression history across packets CPC yields a higher compression ratio than packet by packet compression In most circumstances
66. s about Bay Networks products Training programs can take place at your site or at a Bay Networks location For more information about training programs call one of the following numbers Region Telephone number United States and Canada 800 2LANWAN then enter Express Routing Code ERC 282 when prompted 978 916 3460 direct Europe Middle East and Africa 33 4 92 96 15 83 Asia Pacific 61 2 9927 8822 Tokyo and Japan 81 3 5402 7041 117352 C Rev 00 xvii Chapter 1 Starting Compression The quickest way to begin using data compression on your network is to enable it with the default configuration that Bay Networks software supplies This chapter briefly introduces Bay Networks data compression and includes the procedures for configuring compression with the default configuration values This chapter contains the following information Topic Page Summary of Bay Networks Data Compression Features 1 2 Preparing a Configuration File for Data Compression 1 5 Configuring Software Compression 1 6 Configuring Hardware Compression 1 8 For More Information 11 117352 C Rev 00 1 1 Configuring Data Compression Services Summary of Bay Networks Data Compression Features You can configure both software and hardware based compression on a circuit or line basis Features specific to software and hardware compression follow Software Based
67. s cateellivaivedad aandeatiaa anderen 3 2 WOP Line Interface Parameters ee E E rere metas meena P WOP Circuit Iihteriace Paramelorg xcs ccccstarcasiccpdae ccesescteanunpncseconteedingndetesctachuntianeanneats 3 3 Hiir LZS Circuit Interlace Parameters sos sso iwesrcasaauteoiesradioeiacdesubennddens 3 4 Allocating Compression Memory for WOP erui eer renan e T raea ee vi 117352 C Rev 00 Maximizing the Compression Ratio sassrusvnninisnaiima a Modifying the Compression Mode cccccccccaanceeneccanacscaesscnseaenausnedaneananenne 3 6 Maximizing TUG wstirssccsstirtacsrosrtacieriatycncdestirendene a tien 3 6 SEE PISO E E Seen Peae Pere Pee seer ere rT ery rr ipee reer ty rerree crt prey rere rrr rrr errr rrr eerer 3 7 32 KB History Size meee meee PPE TOA P P AE E 3 7 History Size with Hardware CompresSiOn cccceseceeeeeeeeeeeeeeeseeeeeeeaeeeeeneees 3 7 IN the TANS DIZE siarsio wait ease Aan AEN ka SE DA 3 9 Preventing Data Loss for PPP and Frame Relay ni ES P T P S Moding ihe Buler SZE oss oh rsik parece atte sn NN AE EN 3 10 Configuring Hardware COmpressio sssaisisuriisirsresinineeai innn i iama iaaa 3 10 Selecting Software or Hardware Compression Engines cccceeseeesteeeeneees 3 10 Selecing Compression ENGINES cscsicsiiss eveniraeics mein lant imeasniaaeaipras 3 11 Selecting a Fallback Compression Mode E A T Rested ie 3 11 Modifying the Fallback Compress
68. st or altered files data or programs 4 Limitation of liability INNO EVENT WILL BAY NETWORKS OR ITS LICENSORS BE LIABLE FOR ANY COST OF SUBSTITUTE PROCUREMENT SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES RESULTING FROM INACCURATE OR LOST DATA OR LOSS OF USE OR PROFITS ARISING OUT OF OR IN CONNECTION WITH THE PERFORMANCE OF THE SOFTWARE EVEN IF BAY NETWORKS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES IN NO EVENT SHALL THE LIABILITY OF BAY NETWORKS RELATING TO THE SOFTWARE OR THIS AGREEMENT EXCEED THE PRICE PAID TO BAY NETWORKS FOR THE SOFTWARE LICENSE 5 Government Licensees This provision applies to all Software and documentation acquired directly or indirectly by or on behalf of the United States Government The Software and documentation are commercial products licensed on the open market at market prices and were developed entirely at private expense and without the use of any U S Government funds The license to the U S Government is granted only with restricted rights and use duplication or disclosure by the U S Government is subject to the restrictions set forth in subparagraph c 1 of the Commercial Computer Software Restricted Rights clause of FAR 52 227 19 and the limitations set out in this license for civilian agencies and subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause of DFARS 252 227 7013 for agencies of the Department of Defense or their successors
69. tialization request _ _ lt lt Send initialization request Send initialization ACK o o oe lt Send initialization ACK 3 WCP negotiations complete begin NCP negotiations Send configure request gt lt Send configure request Send configure ACK e Send configure ACK 4 NCP open begin transmitting data lt lt Send data gt DC0001A Figure 2 1 CCP and WCP Initialization on a PPP Link 117352 C Rev 00 2 9 Configuring Data Compression Services CCP Negotiations CCP allows the two ends of a PPP connection to negotiate whether to use data compression and if so which algorithm to use Both WCP and Hi fn LZS use CCP to negotiate compression Note If one side of a link requests an algorithm that the other side does not support traffic over the link continues but in uncompressed form In Figure 2 1 negotiations begin when PPP establishes a link CCP uses the same configuration and network control protocol negotiations that the Link Control Protocol LCP uses to establish a link For Hi fn LZS CCP also provides the following e History reset request messages e Request acknowledgment messages These messages help to synchronize the receipt and transmission of the compression and decompression history after a packet is lost WCP does not use these messages For an explanation of LCP negotiations see Configuring PPP Services WCP Negotiations WOP allows two e
70. tract either call your local Bay Networks field sales office or one of the following numbers Region Telephone number Fax number United States and 800 2LANWAN then enter Express Routing 978 916 3514 Canada Code ERC 290 when prompted to purchase or renew a service contract 978 916 8880 direct Europe 33 4 92 96 69 66 33 4 92 96 69 96 Asia Pacific 61 2 9927 8888 61 2 9927 8899 Latin America 561 988 7661 561 988 7550 Information about customer service is also available on the World Wide Web at support baynetworks com xvi 117352 C Rev 00 How to Get Help About This Guide If you purchased a service contract for your Bay Networks product from a distributor or authorized reseller contact the technical support staff for that distributor or reseller for assistance If you purchased a Bay Networks service program call one of the following Bay Networks Technical Solutions Centers Technical Solutions Center Telephone number Fax number Billerica MA 800 2LANWAN 978 916 3514 Santa Clara CA 800 2LANWAN 408 495 1188 Valbonne France 33 4 92 96 69 68 33 4 92 96 69 98 Sydney Australia 61 2 9927 8800 61 2 9927 881 1 Tokyo Japan 81 3 5402 0180 81 3 5402 0173 Bay Networks Educational Services Through Bay Networks Educational Services you can attend classes and purchase CDs videos and computer based training program
71. y for backup purposes in support of authorized use of the Software and c to use and copy the associated user manual solely in support of authorized use of the Software by Licensee This license applies to the Software only and does not extend to Bay Networks Agent software or other Bay Networks software products Bay Networks Agent software or other Bay Networks software products are licensed for use under the terms of the applicable Bay Networks Inc Software License Agreement that accompanies such software and upon payment by the end user of the applicable license fees for such software 2 Restrictions on use reservation of rights The Software and user manuals are protected under copyright laws Bay Networks and or its licensors retain all title and ownership in both the Software and user manuals including any revisions made by Bay Networks or its licensors The copyright notice must be reproduced and included with any copy of any portion of the Software or user manuals Licensee may not modify translate decompile disassemble use for any competitive analysis reverse engineer distribute or create derivative works from the Software or user manuals or any copy in whole or in part Except as expressly provided in this Agreement Licensee may not copy or transfer the Software or user manuals in whole or in part The Software and user manuals embody Bay Networks and its licensors confidential and proprietary intellectual property Licensee sh

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