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Avaya Configuring Data Compression Services User's Manual

1. These two protocols use different Lev Zimpel algorithms to implement compression and they 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 Stac LZS Software based data compression works over WAN links Specifically WCP works with PPP frame relay and X 25 links while Stac LZS works only with PPP links Both WCP and Stac LZS work with PPP multilink WCP also works with PPP multiline Software compression includes the following features 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 e Compression on a Bay Networks Access Node AN9 platform at 2 x 64 KB s compressed throughput full duplex or 128 KB s aggregate compressed throughput 117352 B Rev 00 Starting Compression Compression on all intelligent link interface ILI modules that support serial and ISDN BRI ports Support for all Bay Networks platforms AN Access Stack Node ASN Advanced Remote Node ARN Backbone Node BN9 and System 5000 Compression on MCT1 and MCEI lines Hardware Based Data Compression Hardware compression uses WCP as the compression protocol and it works over WAN li
2. Configuring Data Compression Services BayRS Version 12 10 Site Manager Software Version 6 10 Part No 117352 B Rev 00 February 1998 n Bay Networks e 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 February 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 BCN BLN BN FRE and Bay Networks are registered trademarks and ARN ASN BayRS BayStream System 5000 and the Bay Networks logo are trademarks of Bay Networks Inc Bay Networks Hi fn LZS Compression Option incorporates LZS from Hi fn Inc LZS is a registered trademark of Hi fn Inc Hi fn is a trademark of Hi fn Inc All other trademarks and registered trademarks are the property of their respective owners Restricted Rights Lege
3. and hardware based compression interoperate fully because they use the same algorithm Stac LZS software compression does not interoperate with hardware compression To use data compression effectively you must decide how to allocate memory for this task The goal is to compress data as much as possible and to transmit the data as quickly as possible without taxing the resources of the router 2 2 117352 B Rev 00 Data Compression Overview Data Compression Architecture WCP and Stac 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 Stac LZS respectively Table 2 1 Data Compression Algorithms and Protocols WCP Stac LZS LZ 77 algorithm Stac LZS algorithm Compression Control Protocol RFC 1962 Compression Control Protocol RFC 1962 Bay Networks proprietary compression References the PPP Stac LZS protocol WCP Compression protocol RFC 1974 as a guideline You want to ensure that routers at both ends of the connection are using the same compression protocol You cannot have one router using WCP compression and another router using Stac LZS compression If both ends of the connection are Bay Networks routers use WCP as the compression protocol I
4. 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 whichever is applicable 6 Use of Software in the European Community This provision applies to all Software acquired for use within the European Community If Licensee uses the Software within a country in the European Community the Software Directive enacted by the Council of European Communities Directive dated 14 May 1991 will apply to the examination of the Software to facilitate interoperability Licensee agrees to notify Bay Networks of any such intended examination of the Software and may procure support and assistance from Bay Networks 7 Term and termination This license is effective until terminated however all of the restrictions with respect to Bay Networks copyright in the Software and user manuals will cease being effective at the date of expiration of the Bay Networks copyright those restrictions relating to use and disclosure of Bay Networks confidential information shall continue in effect Licensee may terminate this license at any time The license will automatically terminate if Licensee fails to comply with any of the terms and conditions of the license Upon termination for any reason Licensee will immediately destroy or return to Bay Networks the Software user manuals and all copies Bay Networks is not liable to Licensee for damages in any form solely by reason of the termin
5. 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 Indicates the compression mode on the circuit Continuous Packet Compression CPC retains compression history across packets and allows a higher compression ratio than does 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 Since 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 A 6 117352 B Rev 00 Parameter Path Default Options Function Instructions MIB Object ID Data Compression Parameters History Size Configuration Manager gt Protocols gt WCP gt Interfaces Inherit from Line 32 K 8 K Inherit from Line Indicates the amount of memory allocated to compression history for the line Remember that history size has separate comp
6. 3 3 Stac LZS Interface List Window To access this window complete the tasks in the following table Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose Stac LZS The Stac LZS menu opens 3 Choose Interfaces The Stac LZS Interfaces List window opens 4 Edit the Enable parameter Site Manager changes the parameter value Click on Help or refer to the parameter descriptions beginning on page A 8 5 Click on Done You return to the Configuration Manager window 3 6 117352 B Rev 00 Customizing Data Compression Allocating Compression Memory for WCP Using WCP across a network involves allocating memory to maximize compression without taxing the resources of your system You can select e A compression mode to maximize compression ratio e history size to maximize throughput e A buffer size to prevent data loss Maximizing 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 does packet by packet In most circumstances 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 does CPC Select PPC only for links that drop a very
7. Services 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 further information on Bay Networks dial services refer to Configuring Dial Services Frame Relay Multiline Multiline is a feature that enables you to configure a single circuit that consists 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 refer to Configuring WAN Line 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
8. 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 WCEP Line Interface Parameters e WOP Circuit Interface Parameters on page 3 4 e Stac LZS Enable Parameter on page 3 6 WCP Line Interface Parameters The WCP Line Interfaces List window Figure 3 1 includes all the data compression line parameters Line 203108 Slot 3 COMS Eons Line 204101 Slot 4 COM1 Apply Line 205103 Slot 5 COM3 Values Help r1 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 B Rev 00 Customizing Data Compression To access this window complete the tasks in the following table Site Manager Procedure You do this System responds 1 In the Configuration Manager window choose Protocols The Protocols menu opens Choose WCP The WCP menu opens 3 Choose Lines The WOP Line Interfaces List window opens 4 Edit any of the following parameters Site Manager changes the parameter Enable value Compression Mode History Size Buffer Size Engine Type Fallback Compression Mode Click on Help or refer to the parameter descriptions beginning on page A 1 5 Click on Done Y
9. 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 B Rev 00 A 9 Configuring Data Compression Services Parameter Path Default Options Function Instructions MIB Object ID Compression Protocol Configuration Manager gt Protocols gt PPP gt Interfaces Any Any WCP Stac LZS Specifies the compression protocol the router uses for this interface Accept the default Any if you want the router to automatically select the compression protocol that is compatible with the remote router as follows f the remote router can use either WCP or Stac LZS the router selects WCP for example if both ends of the connection are Bay Networks routers f the remote router does not use WCP but uses Stac LZS the router selects Stac LZS Conversely if the remote router does not use Stac LZS but uses WCP the router selects WCP f the remote router does not recognize either WCP or Stac 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 Stac LZS as the compression protocol if the remote router is not a Bay Networks router 1 3 6 1 4 1 18 3 5 9 2 2 1 72 A 10 117352 B Rev 00 bandwidth on demand description 2 11 buffer siz
10. all VCs that exceed the hardware context limit use software compression For more information on CPC and PPC see Chapter 3 Customizing Data Compression 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 Stac 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 refer to Figure 2 1 which illustrates CCP and WCP initialization on a PPP link Figure 2 1 applies for Stac LZS also but only steps 1 3 and 4 If compression is across a frame relay or X 25 link the router only negotiates WCP then data transmission can take place CCP does not apply 117352 B Rev 00 2 7 Configuring Data Compression Services Router A Router B j m _ 1 PPP interface on network LCP negotiations complete begin CCP and other NCP negotiations Send initialization request gt E Send initialization request Send initialization ACi o gt __ Send initialization ACK 2 CCP negotiations complete begin WCP negotiations including compression mode history size and buffer size Sendilnitialization request lt Send initialization Request Send initialization ACK T E Send initialization ACK 3 WCP negotiations c
11. and replaces these strings in the outgoing data with encoded tokens of shorter length Stac LZS creates the encoded tokens from information in a table that the Stac LZS algorithm builds This table consists of string matches which point to previous incoming data As the table builds and tokens are created subsequent data is compressed based on previous data Compression 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 Stac 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 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
12. configuration windows refer to Accessing Configuration Windows on page 3 2 For parameter descriptions refer to Appendix A Data Compression Parameters 117352 B Rev 00 3 13 Configuring Data Compression Services Changing the Control and Compression Protocol There are two PPP interface parameters that you can modify for compression the CCP Type and the Compression Protocol These parameters enable the router to operate with Bay Networks routers using BayRS router software prior to Version 12 10 and with non Bay Networks routers Modifying the CCP Type enables a router operating with version 12 10 software to be compatible with routers running previous versions of software that negotiate WCP below the PPP multilink bundle Modifying the Compression Protocol lets you specify a particular protocol to use or instructs the router to negotiate which protocol to use For parameter descriptions refer to Appendix A Data Compression Parameters To modify these parameters complete the tasks in the following table 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 Site Manager changes the parameter Click on Help or see the parameter value description on page A 9 5 Set the Compression Proto
13. customer service is also available on the World Wide Web at support baynetworks com xvi 117352 B 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 programs 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 5
14. is the amount of memory allocated to keep 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 Length of time it takes for data to travel over the link A Normal buffer size is usually 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 Number of dropped packets For a link with a large number of dropped packets increase the buffer size For a link with a very small number of dropped packets decrease the buffer size even to None to conserve memory Number of resets For a link with a large 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 so if you are configuring compression for X 25 you do not need to set this parameter 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 i
15. 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 use PPC Modifying the Compression Mode To determine 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 information on accessing configuration windows refer to Accessing Configuration Windows on page 3 2 For parameter descriptions refer to Appendix A Data Compression Parameters 117352 B Rev 00 3 7 Configuring Data Compression Services 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 make 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 that 8 KB and 32 KB history sizes use Table 3 1 Memory Allocat
16. 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 If you are configuring compression for X 25 you do not have to set this parameter Parameter Path Default Options Function Instructions MIB Object ID Engine Type Configuration Manager Protocols WCP Lines Software unless you have configured either an Octal Sync link module that has a hardware compression daughterboard for the BN or a hardware compression net module for the ASN in which case the default is Hardware Software Hardware Determines whether compression for this node will be software 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 B Rev 00 Parameter Path Default Options Function Instructions MIB Object ID Data Compression Parameters Fallback Compression Mode
17. 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 solely 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
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19. 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 7 Compression Features for Specific Protocols 2 10 117352 B 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 This includes PPP compression on multiline multilink on the ISDN BRI and PRI modules and on lines that use Raise DTR or V 25bis modem interfaces with dial services It also includes frame relay compression on multiline and dial backup lines Hardware based compression for PPP and frame relay networks that use the octal synchronous link module for the BN using FRE 2 processors Hardware compression supports all of the PPP and frame relay services that WCP software compression supports Hardware based compression for PPP and frame relay networks for the ASN A compression net module compresses data transmitted over a WAN network by dual and quad synchronous MCE1 ISDN PRI MCTI ISDN dual sync with ISDN BRI and QBRI net modules Hardware compression supports all of the PPP services that WCP software compression supports Bay Networks WCP software
20. 402 7041 117352 B 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 to 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 4 Configuring Software Compression 1 7 Configuring Hardware Compression 1 7 Finding Further Information 1 9 117352 B 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 Data Compression There are two Bay Networks software compression protocols e WAN Compression Protocol WCP for Point to Point Protocol PPP frame relay and X 25 links e Stac LZS for PPP links only Note The Hi fn Stac LZS Compression Option is not included with your initial purchase of Bay Routing Software BayRS Bay Networks Stac LZS compression software incorporates LZS licensed from Hi fn and therefore must be separately purchased
21. Configuration Manager gt Protocols gt WCP gt Lines Software CPC Software CPC Hardware PPC This parameter is for hardware compression only Use it to indicate the compression mode you want to use when no hardware compression contexts are available Select Software CPC or Hardware PPC Software CPC is a good choice for lower speed links 64 Kb s or less It generally affords a better compression ratio than does Hardware PPC Hardware PPC is a good choice for higher speed links greater than 64 Kb s It provides better throughput than does Software CPC Refer to Chapter 1 for explanations of continuous packet and packet by packet compression modes 1 3 6 1 4 1 18 3 4 22 1 1 10 117352 B Rev 00 A 5 Configuring Data Compression Services 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 Bay Networks data compression Enable Configuration Manager gt Protocols gt WCP gt Interfaces Enable Enable Disable Enables or disables data compression on the line 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 platform set this parameter to Disable Reset it to Enable to reenable WCP 1 3 6 1 4 1 18 3 4
22. LICENSEE HAS READ THIS AGREEMENT UNDERSTANDS IT AND AGREES TO BE BOUND BY ITS TERMS AND CONDITIONS LICENSEE FURTHER AGREES THAT THIS AGREEMENT 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 B Rev 00 Contents About This Guide EET E e ee eee ee ee bo ocn er ree teen ee eer a eer ee at err errr meer A CE erate xiii ROIS CNN raa cuts ingen te latent amaidetotasaiouenmatdtetannein catenin xiv PCOS Gusescbostissit peores pit d up ea inate ka da ERE Manner p RU a p REN XV Bay Networks Technical Publications vcccecscvseseessssibecnasetsssiwosieochsisesdee tun teca em cetus tuu xvi Bay Nobworks Customer OVID unciae eee educ recie e rne o Rast cenis buen e deanna xvi Hov Teer HEIP anman kni TR ERU I core bined xvii Bay Networks Educational Services sess Terre e tier eee etre ree xvii Chapter 1 Starting Compression Summary of Bay Networks Data Compression Features ssssseseeee 1 2 Soltware Based Data Compressor cis pes bred Re eco n ER Put ia aair 1 2 Hardware Based Data Compression ssssssssssseseeeeeeee enne 1 3 Prep
23. 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 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 1 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 secur
24. anager window WCP and Stac LZS cannot operate on the same line Do not configure them together on a line 117352 B Rev 00 1 5 Configuring Data Compression Services Enabling Compression for X 25 To enable WCP for 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 tasks in the following table Site Manager Procedure You do this System responds 1 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 Click on OK The WAN Protocols window opens Choose X 25 then click on OK The X 25 Packet Configuration window opens Enter the required information then click on OK The X 25 Service Configuration window opens Click on Add Enter the required information then click on OK In the X 25 Service Configuration window choose Protocols The X 25 Service Record window opens You return to the X 25 Service Configuration window The Protocols menu opens Choose Add Delete The Select Protocols window opens Scroll down the Select Protocols window and choose WCP Site Manager enables compression on this interface and then returns you to the X 25 Service Configuration wi
25. aring a Configuration File for Data Compression sese 1 4 Configuring Software Comp eSBlOll auo roter cc n rneep te e Rot ace perena aana 1 5 Enabling Compression for PPP and Frame Relay c ccssceseseeeeeeeeeeeeeeeeeeeeneees 1 5 Enabling Compression for X 25 t TT eerste teenie iiio a0 Gordiguring Hardware Compression 45 22 1 reda aae P p t E rd KR VER RAT CARA d 1 7 Configuring Compression for the Backbone Node BN seseseree 1 7 Configuring Compression for the Access Stack Node ASN sussuss 1 8 Eph PERSE Monaton issvstrienoiiir rh bci pacto ebat Ferca Pre at Lac aa P p D D HA ARR an 1 9 Chapter 2 Data Compression Overview Bay Networks Compression Services neret sb aetate ka EUER iienaa 2 2 Data Compression Architecture 122i isiaunc cpm oo ttusuc opa sad a aur alan t dus Fn DA ERR OG x UN 2 3 L2H F sun e 2 3 eia Ls EDO o pco inti magico ooa poda abbat punta zu a RR asa nd 2 4 Compression Control Protocol CCP enti Soraid TA E T E 2 4 117352 B Rev 00 V Bay Networks WAN Compression Protocol WOP ccccceeeeeeeeseeeeteeeeeeetaaeeeeaes 2 4 PPP Stac LZS Compression Protocol T atacand TET 2 5 Data Compression Perfor mange aee E 2 5 CUS Sl eee ial eis cts renadenn a a 2 5 Hardware Compression for the BN TEM TEE PER E P 2 6 Hard
26. at faster speeds you should use hardware compression 2 4 117352 B Rev 00 Data Compression Overview PPP Stac LZS Compression Protocol PPP uses CCP to negotiate how the router uses the Stac LZS RFC 1974 compression protocol Specifically CCP negotiates the different compression modes that RFC 1974 supports Bay Networks negotiates only mode 3 and the number of compression histories of which we support only one history RFC 1974 is only specified as an error detection protocol it does not contain a transmit history like WCP Instead it relies on upper layer protocols for to retransmit data when errors occur For more information on 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 a lot of redundant strings compresses at a high ratio Throughput varies with the number of devices in the network that the data must travel Throug
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28. cause of the 8 KB of memory the one PPC context requires Table 3 3 shows the maximum number of 32 KB contexts each board can support Table 3 3 Hardware Compression 32 KB Contexts Max 32 KB Available 8 KB Reserved 8 KB CPC Contexts CPC Contexts PPC Context 32 Context Board 7 3 1 128 Context Board 31 3 1 You can mix 8 KB and 32 KB contexts on either board Be aware that if you are bringing VCs up and down memory may fragment Even though you have 32 or more KB 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 memory available you are always able to add an 8 KB context because 8 KB is the smallest divisible amount of compression memory Modifying the History Size To maximize throughput 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 information on accessing configuration windows refer to Accessing Configuration Windows on page 3 2 For parameter descriptions refer to Appendix A Data Compression Parameters 3 10 117352 B Rev 00 Customizing Data Compression Preventing Data Loss for PPP and Frame Relay Buffer size
29. col Site Manager changes the parameter parameter value Click on Help or see the parameter description on page A 10 6 Click on Done You return to the Configuration Manager window 3 14 117352 B Rev 00 Disabling Customizing Data Compression Compression You may want to temporarily disable compression on a line then reenable it later Disabling WCP To disable WCP modify the Enable parameter To modify this parameter access the WCP Line Interfaces List window For information on accessing configuration windows refer to Accessing Configuration Windows on page 3 2 For parameter descriptions refer to Appendix A Data Compression Parameters Disabling Stac LZS To disable Stac LZS modify the Enable parameter To modify this parameter access the Stac LZS Interfaces List window For information on accessing configuration windows refer to Accessing Configuration Windows on page 3 2 For parameter descriptions refer to Appendix A Data Compression Parameters Deleting Data Compression from a Router To delete compression from all circuits on the router begin at the Configuration Manager window and complete the tasks in the following table Site Manager Procedure You do this System responds 1 In the Configuration Manager window The Protocols menu opens choose Protocols 2 Choose WCP or Stac LZS The WCP or Stac LZS menu opens 3 Choose Delete WCP
30. 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 Bay Networks Site Manager and router software For instructions refer to the BayRS Version 12 10 Document Change Notice 117352 B Rev 00 xiii Configuring Data Compression Services Conventions bold text italic text quotation marks Screen text separator gt vertical line I Indicates text that you need to enter command names and buttons in menu paths Example Enter wfsm amp Example Use the dinfo command Example ATM DXI Interfaces 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 Indica
31. e preventing data loss 3 11 C circuit interface parameters A 6 Compression Control Protocol CCP definition 2 3 initialization 2 8 negotiations 2 9 compression modes choosing 3 7 compression protocol selecting 3 14 compression See data compression 1 5 configuration windows accessing 3 2 contexts for hardware compression 2 6 control protocol selecting 3 14 customer support programs xvi Technical Solutions Centers xvii D data compression accessing configuration windows 3 2 architecture 2 3 configuring hardware 1 7 configuring software 1 5 customizing the configuration 3 1 deleting from a router 3 15 features 1 2 maximizing performance 2 5 memory allocating 3 7 117352 B Rev 00 Index modes choosing 3 7 continuous 3 7 packet by packet 3 7 modifying compression protocol 3 14 modifying control protocol 3 14 overview 1 2 2 1 starting 1 1 data loss preventing 3 11 daughterboards for hardware compression 2 6 deleting compression 3 15 dial backup frame relay 2 13 PPP 2 12 dial on demand frame relay 2 13 PPP 2 12 E engines for hardware compression 3 12 F fallback compression mode choosing 3 13 frame relay data compression features 2 13 dial backup 2 13 dial on demand 2 13 hybrid mode 2 13 multiline 2 14 preventing data loss 3 11 Index 1 H hardware compression configuring 1 7 contexts 2 6 daughterboards and net modules 2 5 hi
32. e compression does not put 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 Both boards 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 it may not cross pages For 8 KB contexts these restrictions create few constraints but for 32 KB contexts they are significant Thirty one CPC contexts each using an 8 KB history are possible on the 32 context board and 127 contexts each using an 8 KB history are possible on the 128 context board Table 3 2 shows the maximum number of 8 KB contexts each board can support Table 3 2 Hardware Compression 8 KB Contexts Max 8 KB Available 32 KB Reserved 8 KB CPC Contexts CPC Contexts PPC Context 32 Context Board 31 0 1 128 Context Board 127 0 1 117352 B Rev 00 3 9 Configuring Data Compression Services On a 32 context board the maximum number of 32 KB contexts is 7 and on a 128 context board the maximum number of 32 KB contexts is 31 be
33. ective 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 32 K or 8 K 1 3 6 1 4 1 18 3 4 22 2 1 5 117352 B Rev 00 A 7 Configuring Data Compression Services Parameter Path Default Options Function Instructions MIB Object ID Engine Type Configuration Manager gt Protocols gt WCP gt Interfaces Inherit from Line Software Hardware Inherit from Line Determines whether compression for this node will be software 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 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 2 1 6 Stac LZS Parameter Parameter Path Default Options Function Instructions MIB Object ID Use the following parameter description to enable Stac LZS compression Enable Configuration Manager gt Protocols gt Stac LZS gt Interfaces Enable Enable Disable Enables or disables Stac LZS compression on this interface Site Manager automatically sets this parameter to Enable when you s
34. elect Stac LZS as the compression protocol If you want to temporarily disable Stac LZS rather than delete it from the router set this parameter to Disable To reenable Stac LZS reset it to Enable 1 3 6 1 4 1 18 3 4 22 6 1 2 A 8 117352 B Rev 00 Data Compression Parameters PPP Interface Parameters for Compression There are two PPP interface parameters for data compression You can find them by scrolling through the PPP Interfaces List window For more information about PPP refer to 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 Stac 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 software prior to Version 12 10 Using ILCCP as the compression type means that the router will negotiate compression below the multilink bundle If you have a Bay Networks 12 10 router using an older configuration file the routers negotiate
35. er 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 117352 B Rev 00 Customizing Data Compression Selecting Compression Engines To determine the compression for this router modify the Engine Type parameter To modify this parameter for the line access the WCP Line Interfaces List window To modify the this parameter for a circuit access the WCP Circuit Interfaces List window For information on accessing configuration windows refer to Accessing Configuration Windows on page 3 2 For parameter descriptions refer to Appendix A Data Compression Parameters Selecting a Fallback Compression Mode Fallback compression mode is configurable on a line basis only Use it to indicate the compression mode that you want to use when no hardware compression contexts are available The options are as follows Software CPC a good choice for lower speed links 64 Kb s or less It generally affords a better compression ratio than does Hardware PPC e Hardware PPC a good choice for higher speed links greater than 64 Kb s It provides better throughput than does Software CPC Modifying the Fallback Compression Mode To indicate the compression mode modify the Fallback Compression Mode parameter To modify this parameter access the WCP Line Interfaces List window For information on accessing
36. es 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 12 10 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 117352 B Rev 00 2 11 Configuring Data Compression Services If a router using software version 12 10 software is communicating with a router using software prior to version 12 10 the routers must negotiate WCP below the bundle so the thresholds will be based on uncompressed data To configure these thresholds refer to 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 dial backup service If a primary PPP line fails and you have 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 prima
37. eturn to the Configuration Manager window The WAN net module is placed over the compression module 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 7 Choose one of the following WAN Site Manager selects the protocol protocols PPP Frame Relay Click on OK The Select Protocols window opens Scroll through the Select Protocols Site Manager enables compression on window and choose WCP this interface 10 Click on OK You return to the Configuration Manager window f 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 compression on the ASN does not work across slots that is it does not provide compression for any other ASNs in the stack 1 8 117352 B Rev 00 Starting Compression Finding Further Information For detailed information on Bay Networks data compression refer to Chapter 2 For information and recommendations about using nondefault values to customize compression refer to Chapter 3 117352 B Rev 00 1 9 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
38. f the connection is a PPP link and only one end of the connection is a Bay Networks router use Stac LZS If you want the router to negotiate which protocol is used set the Compression Protocol parameter refer to page A 10 for a parameter description LZ 77 Algorithm Bay Networks WCP data compression software 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 B Rev 00 2 3 Configuring Data Compression Services Stac LZS Algorithm Hi fn is a wholly owned subsidiary of Stac Inc Bay Networks Stac LZS compression software incorporates LZS from Hi fn In this documentation the Hi fn Lzs9 algorithm is referred to as Stac LZS Bay Networks Stac LZS compression software is based on the Stac LZS algorithm to transport compressed packets across a PPP link Stac LZS implements an error detection mechanism which means it can detect if packets are lost during transmission Stac LZS does not retransmit packets if they are lost The Stac LZS compression algorithm searches incoming data for redundant data strings
39. face Parameters Metros Sere E S P m 3 4 Stac LZS Enable uir pci tet E 3 6 Allocating Compression Memory for WOP iuuaisaseeceu dui use sidus tb cuc etr ka tad Eee 3 7 Maximizing Compression Ratio T iind TE iste pis mand vi 117352 B Rev 00 Modifying the Compression Mode sees ee OO Tigers A TAIN socso as iod Gb iar uet Garin edness Da 3 8 8 KE FISD GIZ lt ee eee ee reer eee a eee ere ere ree es 3 8 2 RB H TON SZ us eia a VER ERREUR t VEU RR TERT RERO RV RN 3 8 History Size with Hardware Compression eene utis 3 9 PITTA the ESTO elei er 3 10 Preventing Data Loss for PPP and Frame Relay sse 3 11 Modiiying the Buffer SIZE ccsiscuiccsasesscscancossateaases TE nPER Fo uda GRE EFE Sa SEE REFS NE EE QU ORA 3 11 Configuring Hardware Compression iueseixseniedniee TRU E VERI RE VERE Fe EYE FIL SAY RERU AYER E 3 12 Selecting Software or Hardware Compression Engines sssssssss 3 12 Selecting Compression ENGINES 12 occorre rece rete edu e atre Ecc aM P pce p ERAS PiSdS 3 13 Selecting a Fallback Compression Mode 0 ccccccsesceeceeeeeeeeeeeseeeeeeeeeeseaaeeesaeeeeaes 3 13 Modifying the Fallback Compression Mode T abioi TT laine 3 13 Changing the Control and Compression Protocol eiie bee siae 3 14 Lis abii Compresso suiccusad ie p occi bx uf tusd usc tis act Rota U Skunk t a c nU 3 15 Deleti
40. fault circuit name or enter a new name then click on OK The Add Circuit window opens The WAN Protocols window opens 5 Choose one of the following WAN Site Manager selects the protocol protocols PPP Frame Relay 6 Click on OK The Select Protocols window opens 7 Scroll through the Select Protocols window and choose WCP Site Manager enables compression on this interface Click on OK You return to the Configuration Manager window f 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 117352 B Rev 00 1 7 Configuring Data Compression Services Configuring Compression for the Access Stack Node ASN To configure hardware compression for the ASN begin at the Configuration Manager window and complete the tasks in the following table Site Manager Procedure You do this System responds 1 Click on an empty slot and choose one of the following net modules for hardware compression AG2104007 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 same slot that contains the hardware compression module and choose a WAN net module Site Manager selects the WAN net module Click on OK Choose a port You r
41. fault 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 and the balance of traffic across the bundle is more accurate In addition the router uses less memory for compression Routers using BayRS 12 10 with an older configuration file negotiate WCP below the multilink bundle by default By negotiating compression below the bundle 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 and the remote router is running a version earlier than 12 10 you must change the CCP Type parameter from the default to ILCCP for the local router and set the PPP Mode to multilink For a parameter description of CCP Type refer to Appendix A Data Compression Parameters 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 becom
42. fic 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 When you configure compression you can edit WCP parameters for compression mode history size and buffer size to optimize compression performance on your network 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 Stac 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 117352 B Rev 00 2 9 Configuring Data Compression Services Compression Features for Specific Protocols Bay Networks data compression services vary in some details according to the WAN protocols that you configure Read the following sections to learn about how Bay Networks implementation of data compression applies to PPP frame relay and X 25 services PPP Services You can use software or hardware data compression on all PPP circuits including multiline WCP only and multilink bandwidth on demand dial on demand and dial backup lines When
43. hput 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 T 1 or E 1 lines which often concentrate many lower speed remote connections The hardware compression facility operates at high speeds and also supports high density WAN connections Use hardware compression when you want to achieve high compression ratios and throughput and also want to preserve router memory to perform other functions 117352 B 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 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 sync with ISDN BRI and QBRI 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 ASNs 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 a 32 c
44. ions 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 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 be conservative when you allocate memory to 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 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 3 8 117352 B Rev 00 Customizing Data Compression History Size with Hardware Compression Hardware compression daughterboards and net modules are available in 32 and 128 contexts The numbers 32 and 128 assume a history size of 8 KB per context although you can configure history size at either 8 KB or 32 KB For example if you configure history size at 32 KB you have used four 8 KB contexts and you have that many fewer contexts available to run hardware compression on your network Note Although softwar
45. ity of 117352 B Rev 00 iii its own data and information and for maintaining adequate procedures apart from the Software to reconstruct lost 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
46. nd 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 Data 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 endor
47. nd 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 The backup circuit can inherit the primary 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 Identifiers 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 117352 B Rev 00 2 13 Configuring Data Compression
48. ndow t 10 In the X 25 Service Configuration window select Enable for the Enable Compression parameter Do this for each X 25 interface that you configure Site Manager enables compression for this interface 11 Click on Done You return to the Configuration Manager window Site Manager requires that you configure certain packet and service parameters Refer to Configuring X 25 Services for information about these parameters T At the time you enable compression you can also enable other protocols 1 6 117352 B Rev 00 Configuring Hardware Compression Starting Compression To use hardware compression you must have an octal sync link module with a hardware compression daughterboard for the BN or a hardware compression net module for the ASN You can use hardware compression with PPP and frame relay Configuring Compression for the Backbone Node BN To configure hardware compression for the BN begin at the Configuration Manager window and complete the tasks in the following table Site Manager Procedure You do this System responds 1 Click on an empty slot and choose one of the following octal sync link modules with hardware compression daughterboards AG2104037 AG2104038 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 4 Accept the de
49. nformation on accessing configuration windows refer to Accessing Configuration Windows on page 3 2 For parameter descriptions refer to Appendix A Data Compression Parameters 117352 B Rev 00 Configuring Data Compression Services Configuring Hardware Compression There are two 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 two sections Selecting Software or Hardware Compression Engines When you configure a VC for compression the default compression type varies depending on whether it is a link or net module and depending on the type of router platform Table 3 4 shows the dependencies for the default compression type 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 except for an ASN Software Net module ASN with a hardware Hardware compression net module Refer to Hardware Compression on page 2 5 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 greater than 512 Kb s You would also want to specify software compression for VCs in excess of the numb
50. ng Data Compression from a Router een 3 15 Appendix A Data Compression Parameters WOP Line Interface Parameters aa ana ee ee TM WOP CIRCUIT Interiace ParamatelS orriren I ER setae EPOR eati ine ibe A 6 SG LZS PAUE IOT datione da UR UO HIR S UD UD eters Uu ISSUE ADAE obtu Fa a Ed A 8 PPP Interface Parameters Tor Compression enero eren e nn titer eee adn tret n nana A 9 Index 117352 B Rev 00 vii Figures Figure 2 1 CCP and WOP Initialization on a PPP Link eee 2 8 Figure 3 1 WOP Line Interfaces List Window ee 3 2 Figure 3 2 WGP Circuit Interfaces List WingdoW aene tie eerte censa 3 4 Figure 3 3 Stac LZS Interlace List Window iusserit rnnt nr Reni 3 6 117352 B Rev 00 ix Tables Table 2 1 Data Compression Algorithms and Protocols sssssssss 2 3 Table 3 1 Memory Allocations for Software Compression History 3 8 Table 3 2 Hardware Compression 8 KB Contexts 0 escceeeeeeeeeeeeeeeeeeeesaeeeeaes 3 9 Table 3 3 Hardware Compression 32 KB Contexts sssssssssee 3 10 Table 3 4 Default Compression Type Dependencies preside T Niels 9 12 117352 B 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
51. nks running PPP and frame relay Hardware compression is available as Optional daughterboards for PPP and frame relay networks that use the octal synchronous link module for the BN using FRE 2 processors only Optional net modules for PPP and frame relay networks that use the ASN Hardware compression can compress data transmitted over WANs attached to dual and quad synchronous MCEI ISDN PRI MCTI ISDN dual sync with ISDN BRI and Quad BRI net modules 117352 B Rev 00 Configuring Data Compression Services Preparing a Configuration File for Data Compression To configure data compression you use the Bay Networks Site Manager configuration tool For instructions about how to work with configuration files refer to Configuring and Managing Routers with Site Manager Before starting data compression you should have created and saved a configuration file with at least one unconfigured WAN interface such as a sync port or MCT1 port To configure this interface for compression complete the following tasks Site Manager Procedure You do this System responds 1 Choose Tools The Tools menu opens 2 Choose Configuration Manager The Configuration Manager menu opens 3 Choose Local File Remote File or Dynamic 4 Select the file Site Manager prompts you for the configuration file you want to open The Configuration Manager window opens displaying the router modules From
52. ntinuous Packet Continuous Packet Packet by Packet Continuous Packet Compression CPC retains compression history across packets and allows a higher compression ratio than does Packet by Packet compression Packet by Packet PPC compression resets compression history at the start of each packet resulting in a lower compression ratio Since 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 A 2 117352 B Rev 00 Parameter Path Default Options Function Instructions MIB Object ID Data Compression Parameters History Size Configuration Manager gt Protocols gt WCP gt Lines 32K 32Kl8K Indicates 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 8 KB for compression 16 KB for a lookup table 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 32 KB for compression 64 KB for alookup table 32 KB for decompression Hardware compression has similar requirements Selecting 32 K for PPP WCP should n
53. omplete begin transmitting data lt lt Send data DC0001A Figure 2 1 CCP and WCP Initialization on a PPP Link 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 Stac 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 2 8 117352 B Rev 00 Data Compression Overview 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 Stac LZS CCP also provides the following 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 refer to Configuring PPP Services WCP Negotiations WCP allows two ends 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 traf
54. on Protocol 117352 B 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 contract 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
55. ontexts hardware compression net module e AF2104012 a 128 contexts hardware compression net module Hardware Compression Contexts A context refers to compression and decompression for a single virtual circuit VC Compression hardware maps a context to specific regions of compression and decompression memory If you have a 32 contexts compression daughterboard or net module you can simultaneously run compression 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 If you have a 128 contexts compression daughterboard or net module you can simultaneously run compression over 127 CPC contexts each using an 8 KB history size with one shared 8 KB PPC context 2 6 117352 B Rev 00 Data Compression Overview The difference between the Bay Networks 32 contexts and 128 contexts daughterboards and net modules is their amount of memory The 128 contexts daughterboard and net module have more memory 2 MB compression 1 MB decompression The 32 contexts daughterboard and net module have only 512 KB compression 256 KB 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 cannot control which VCs will use hardware compression By default
56. or Delete Stac LZS Site Manager prompts Do you REALLY want to delete WCP or Stac LZS 4 Click on OK Site Manager returns you to the Configuration Manager window Compression is no longer operating on the router 117352 B Rev 00 3 15 Appendix A Data Compression Parameters This chapter includes parameter descriptions for data compression services WCP Line Interface Parameters Parameter Path Default Options Function Instructions MIB Object ID Use the following descriptions to set Bay Networks data compression line parameters Notice that the Site Manager path for all line parameters is the same as is the path for all circuit interface parameters This means that you can edit all line parameters or all interface parameters at the same time Enable Configuration Manager gt Protocols gt WCP gt Lines Enable Enable Disable Enables or disables data compression on the line 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 platform set this parameter to Disable To reenable WCP reset it to Enable 1 3 6 1 4 1 18 3 4 22 1 1 2 117352 B Rev 00 A 1 Configuring Data Compression Services Parameter Path Default Options Function Instructions MIB Object ID Compression Mode Configuration Manager gt Protocols gt WCP gt Lines Co
57. ot be a problem for the BN because PPP allows only one circuit per single or multiple lines Select 8 K or 32 K for frame relay and X 25 lines depending on the resources of your network Selecting 32 K 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 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 than an 8 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 32 K or 8 K 1 3 6 1 4 1 18 3 4 22 1 1 6 117352 B Rev 00 A 3 Configuring Data Compression Services Parameter Path Default Options Function Instructions MIB Object ID 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 parameter according to the end to end round trip length of a WCP connection Select Normal for
58. ou return to the Configuration Manager window 117352 B Rev 00 Configuring Data Compression Services WCP Circuit Interface Parameters The WCP Circuit Interfaces List window Figure 3 2 includes the data compression circuit parameters Done 553 xvc4 1 204101 0 105 1 104 Delete S38 Apply Values Help fi o 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 3 4 117352 B Rev 00 Customizing Data Compression To access this window complete the tasks in the following table Site Manager Procedure You do this System responds 1 In the Configuration Manager window choose Protocols The Protocols menu opens Choose WCP The WCP menu opens 3 Choose Interfaces The WCP Circuit Interfaces List window opens 4 Edit any of the following parameters Site Manager Changes the parameter Enable value Compression Mode History Size Engine Type Click on Help or refer to the parameter descriptions beginning on page A 6 5 Click on Done You return to the Configuration Manager window 117352 B Rev 00 3 5 Configuring Data Compression Services Stac LZS Enable Parameter The Stac LZS Interface List window Figure 3 3 includes the Enable parameter Done Delete Apply Values Help ENABLE Figure
59. record compression parameter for each X 25 interface that you configure For more information about this parameter refer to Configuring X 25 Services 117352 B Rev 00 Data Compression Overview Adjusting 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 117352 B Rev 00 2 15 Chapter 3 Customizing Data Compression When you enable data compression default values are in effect for all parameters For parameter descriptions refer to Appendix A Data Compression Parameters For WCP and hardware compression you may want to change these values depending on the requirements of your network For Stac LZS the only modification you can make is to disable the protocol if you enabled it This chapter provides information about Bay Networks compression and how to use it effectively on your network This chapter contains the following information Topic Page Accessing Configuration Windows 3 2 Allocating Compression Memory for WCP 27 Configuring Hardware Compression 3 12 Changing the Control and Compression Protocol 3 14 Disabling Compression 3 15 117352 B Rev 00 3 1 Configuring Data Compression Services Accessing Configuration Windows
60. ression 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 8 KB for compression 16 KB for a lookup table 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 32 KB for compression e 64 KB for a lookup table 32 KB for decompression Hardware compression has similar requirements Selecting 32 K for PPP WCP should not be a problem for the BN because PPP allows only one circuit per single or multiple lines Select 8 K or 32 K for frame relay and X 25 lines depending on the resources of your network Selecting 32 K 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 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 than an 8 KB history If you select different history sizes for each side of a link the smaller of the two becomes the eff
61. ry circuit If the primary circuit uses compression then the backup circuit does also For more information on Bay Networks dial services refer to Configuring Dial Services Frame Relay Services You can use software WCP or Stac LZS 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 2 12 117352 B Rev 00 Data Compression Overview 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 have also enabled compression for those interfaces Conversely if you enable data compression for other PVCs but not on a PVC you have configured for hybrid mode the hybrid circuit does not use compression Frame Relay Dial on Demand Frame relay enables you to configure dial on dema
62. se or promote products derived from such portions of the software without specific prior written permission SUCH PORTIONS OF THE SOFTWARE ARE PROVIDED AS IS 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 117352 B 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
63. story size 3 9 selecting engines 3 12 history buffer 2 3 history size modifying 3 8 L Lempel Ziv LZ 77 algorithm 2 3 line interface parameters A 1 Max Window Size parameter X 25 2 15 multiline frame relay 2 14 PPP 2 10 multilink description 2 10 N net modules for hardware compression 2 6 Network Control Protocol NCP negotiations 2 9 P parameters circuit interface A 6 line interface A 1 PPP bandwidth on demand 2 11 data compression features 2 10 dial backup 2 12 dial on demand 2 12 multiline 2 10 multilink 2 10 preventing data loss 3 11 Index 2 S software compression configuring 1 5 description 2 4 disabling 3 15 modifying compression protocol 3 14 modifying control protocol 3 14 STAC LZS deleting from a router 3 15 Stac LZS compression negotiations 2 9 description 2 4 disabling 3 15 features 1 2 overview 2 1 T Technical Solutions Centers xvii throughput description 2 5 maximizing 2 5 3 8 Ww WCP allocating memory 3 7 compression negotiations 2 9 definition 2 3 deleting from a router 3 15 disabling 3 15 features 1 2 initialization 2 8 overview 1 2 2 1 X X25 data compression features 2 14 DDN service 2 14 Max Window Size parameter 2 15 PDN service 2 14 117352 B Rev 00
64. tes 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 19 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 B Rev 00 Acronyms ACK CCP CPC DDN DLCI DTR IETF ILCCP ILI ISDN ISDN BRI ISDN PRI LAPB LCP NCP LAN MCEI MCTI PDN PPC PPP PVC RFC VC TA 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 Compression Control Protocol Intelligent Link Interface Integrated Services Digital Network ISDN Basic Rate Interface ISDN Primary Rate Interface Link Access Procedure Balanced link control protocol Network Control Protocol local area network multichannel E1 multichannel T1 Public Data Network packet by packet compression Point to Point Protocol permanent virtual circuit Request for Comment virtual circuit terminal adapter wide area network WAN Compressi
65. the Configuration Manager window proceed to the following sections to configure a WAN protocol and compression 117352 B Rev 00 Configuring Software Compression Starting Compression Software compression works on all router platforms and all serial interfaces After you open a configuration file go to the one of the following sections to enable compression Enabling Compression for PPP and Frame Relay Enabling Compression for X 25 on page 1 6 Enabling Compression for PPP and Frame Relay To configure software compression for PPP and frame relay begin at the Configuration Manager window and complete the tasks in the following table Site Manager Procedure You do this System responds 1 Click on the link or net module connector The Add circuit window opens for which you are enabling data compression 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 according to the Site Manager enables compression on appropriate procedure this interface For PPP scroll through the Select Protocols window and choose either WCP or Stac LZS For Frame Relay scroll down the Select Protocols window and choose WCP 6 Click on OK You return to the Configuration M
66. ware Compression for the ASN secsanismasiisi eactiasaraenionsens 2 6 Hardware Compression COMIS ussatunnaiisedxosekk uud dedau cta uda teda cedes dE De aaO ud d 2 6 How Data Compression VIDENS cioe ite reste cei abore EE epen eden E ahi diii tee 2 7 ANAS oscar nre kb d ebd p p PER Ka uon rA AE n EL ana ee bb dS 2 8 WCP Negotiations E m T PERE E dan PET 2 9 Data TRANSMISSION e an aE E 2 9 Compression Features for Specific Protocols ccccceeceeeeececeeceneeeeeeeeeeeseeeeeeeeeeeeees 2 10 PPP Services sorenisesens P T TT eese T T EA EE anb a210 adii eT RI UTR 2 10 PPP ROOPUDE Leica on duct utut send debo pelo ub eM t uf RR bd 2 10 PPP Motiokand scd c 2 11 PPP BmnOni dior Tonan pensansa a 2 11 PPP Dial on Demand E E Perr Pere verre T aint eben saeaneaneans 2 12 PPP Dial BACKUP 2 12 Frame Relay GP PICS aronniniinia a a CUBE ub osa us Foe d 2 12 Frame Relay Hybrid Access TET metet n TT P PE 2 13 Frame Relay Diakon DerImalld uaisenisn poe br n OR S a FR bed 2 13 Fame Relay Dial BackUp OPI 2 13 ECor Nitis Rs FT 2 14 JUD OBVIOS ae eee a mtu bp EA 2 14 X 25 PDN and DDN Services PE PE E E aopa EEE 2 14 Adjusting X 25 Max Window SIZE sik desschcntedccts casecncacsstdeacsranesadeecanmecieamcetaadcenns 2 15 Chapter 3 Customizing Data Compression Accessing Configuration Windows e 3 2 WOP Line Interac Paramelele sas pies e nra Pe XR etae Ra t XR RD C ads 3 2 WOP Circuit Inter
67. 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 is a feature that enables you to configure a single circuit that consists 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 PPP Multilink Multilink is a feature of PPP that provides capabilities beyond those of multiline circuits Multilink consists of a bundle of lines between two peers consisting of up to four links Multilink can 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 Balance traffic load and restore packet sequence e Use switched lines such as ISDN B channels as well as leased lines Monitor traffic volume 2 10 117352 B Rev 00 Data Compression Overview PPP Multilink and WCP Depending on the version of Bay Networks router software the router handles the operation of PPP multilink and WCP differently For BayRS 12 10 by de

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