Avaya Configuring Data Compression Services Manual do Utilizador

Part No. 117352-B Rev. 00February 1998BayRS Version 12.10Site Manager Software Version 6.10 Configuring Data Compression Services

117352-B Rev. 00xiTablesTable 2-1. Data Compression Algorithms and Protocols ...2-3Table 3-1. Memory Allocation

117352-B Rev. 00xiii About This GuideIf you are responsible for configuring data compression, you need to read this guide.Before You BeginBefore using

Configuring Data Compression Servicesxiv117352-B Rev. 00Conventionsbold textIndicates text that you need to enter, command names, and buttons in menu

About This Guide117352-B Rev. 00xv AcronymsACK acknowledgmentCCP Compression Control ProtocolCPC continuous packet compressionDDN Defense Data Network

Configuring Data Compression Servicesxvi117352-B Rev. 00Bay Networks Technical PublicationsYou can now print technical manuals and release notes free,

About This Guide117352-B Rev. 00xvii How to Get HelpIf you purchased a service contract for your Bay Networks product from a distributor or authorized

117352-B Rev. 001-1 Chapter 1Starting CompressionThe quickest way to begin using data compression on your network is to enable it with the default con

ii117352-B Rev. 004401 Great America Parkway 8 Federal StreetSanta Clara, CA 95054 Billerica, MA 01821Copyright © 1998 Bay Networks, Inc.All rights re

Configuring Data Compression Services1-2117352-B Rev. 00Summary of Bay Networks Data Compression FeaturesYou can configure both software- and hardware

Starting Compression117352-B Rev. 001-3 • Compression on all intelligent link interface (ILI) modules that support serial and ISDN BRI ports• Support

Configuring Data Compression Services1-4117352-B Rev. 00Preparing a Configuration File for Data CompressionTo configure data compression, you use the

Starting Compression117352-B Rev. 001-5 Configuring Software CompressionSoftware compression works on all router platforms and all serial interfaces.

Configuring Data Compression Services1-6117352-B Rev. 00Enabling Compression for X.25To enable WCP for an X.25 interface, you must first add an X.25 s

Starting Compression117352-B Rev. 001-7 Configuring Hardware CompressionTo use hardware compression you must have an octal sync link module with a har

Configuring Data Compression Services1-8117352-B Rev. 00Configuring Compression for the Access Stack Node (ASN)To configure hardware compression for t

Starting Compression117352-B Rev. 001-9 Finding Further InformationFor detailed information on Bay Networks data compression, refer to Chapter 2. For

117352-B Rev. 002-1 Chapter 2Data Compression OverviewBay Networks data compression services enable you to reduce line costs and improve response time

117352-B Rev. 00iiiBay Networks, Inc. Software License AgreementNOTICE: Please carefully read this license agreement before copying or using the acco

Configuring Data Compression Services2-2117352-B Rev. 00Bay Networks Compression ServicesBay Networks compression services include:• Software-based co

Data Compression Overview117352-B Rev. 002-3 Data Compression ArchitectureWCP and Stac LZS use different compression algorithms and protocols. The com

Configuring Data Compression Services2-4117352-B Rev. 00Stac LZS AlgorithmHi/fn™ is a wholly owned subsidiary of Stac, Inc. Bay Networks Stac LZS comp

Data Compression Overview117352-B Rev. 002-5 PPP Stac LZS Compression ProtocolPPP uses CCP to negotiate how the router uses the Stac LZS, RFC 1974 com

Configuring Data Compression Services2-6117352-B Rev. 00Hardware Compression for the BNThe BN supports the following compression daughterboards:• AG21

Data Compression Overview117352-B Rev. 002-7 The difference between the Bay Networks 32-contexts and 128-contexts daughterboards and net modules is th

Configuring Data Compression Services2-8117352-B Rev. 00Figure 2-1. CCP and WCP Initialization on a PPP LinkCCP NegotiationsCCP allows the two ends of

Data Compression Overview117352-B Rev. 002-9 In Figure 2-1, negotiations begin when PPP establishes a link. CCP uses the same configuration and networ

Configuring Data Compression Services2-10117352-B Rev. 00Compression Features for Specific ProtocolsBay Networks data compression services vary in som

Data Compression Overview117352-B Rev. 002-11 PPP Multilink and WCPDepending on the version of Bay Networks router software, the router handles the op

iv117352-B Rev. 00its own data and information and for maintaining adequate procedures apart from the Software to reconstruct lost or altered files,

Configuring Data Compression Services2-12117352-B Rev. 00If a router using software version 12.10 software is communicating with a router using softwa

Data Compression Overview117352-B Rev. 002-13 Frame Relay Hybrid AccessHybrid access enables you to combine bridging and routing over a single frame r

Configuring Data Compression Services2-14117352-B Rev. 00To use data compression with frame relay dial backup, you must configure compression on both

Data Compression Overview117352-B Rev. 002-15 Adjusting X.25 Max Window SizeWindow size can affect packet throughput across the X.25 network. Setting

117352-B Rev. 003-1 Chapter 3Customizing Data CompressionWhen you enable data compression, default values are in effect for all parameters. For parame

Configuring Data Compression Services3-2117352-B Rev. 00Accessing Configuration WindowsTo customize compression, you need to access specific configura

Customizing Data Compression117352-B Rev. 003-3 To access this window, complete the tasks in the following table:Site Manager ProcedureYou do this Sys

Configuring Data Compression Services3-4117352-B Rev. 00WCP Circuit Interface ParametersThe WCP Circuit Interfaces List window (Figure 3-2) includes t

Customizing Data Compression117352-B Rev. 003-5 To access this window, complete the tasks in the following table:Site Manager ProcedureYou do this Sys

117352-B Rev. 00vContents About This GuideBefore You Begin ...

Configuring Data Compression Services3-6117352-B Rev. 00Stac LZS Enable ParameterThe Stac LZS Interface List window (Figure 3-3) includes the Enable p

Customizing Data Compression117352-B Rev. 003-7 Allocating Compression Memory for WCPUsing WCP across a network involves allocating memory to maximize

Configuring Data Compression Services3-8117352-B Rev. 00Maximizing ThroughputEach side of the link has both a compression and decompression history an

Customizing Data Compression117352-B Rev. 003-9 History Size with Hardware CompressionHardware compression daughterboards and net modules are availabl

Configuring Data Compression Services3-10117352-B Rev. 00On a 32 context board, the maximum number of 32 KB contexts is 7, and on a 128 context board,

Customizing Data Compression117352-B Rev. 003-11 Preventing Data Loss for PPP and Frame RelayBuffer size is the amount of memory allocated to keep the

Configuring Data Compression Services3-12117352-B Rev. 00Configuring Hardware Compression There are two issues specific to hardware compression:• Sele

Customizing Data Compression117352-B Rev. 003-13 Selecting Compression EnginesTo determine the compression for this router, modify the Engine Type par

Configuring Data Compression Services3-14117352-B Rev. 00Changing the Control and Compression ProtocolThere are two PPP interface parameters that you

Customizing Data Compression117352-B Rev. 003-15 Disabling CompressionYou may want to temporarily disable compression on a line, then reenable it late

vi117352-B Rev. 00Bay Networks WAN Compression Protocol (WCP) ...2-4PPP Stac LZS Compression Protocol

117352-B Rev. 00A-1 Appendix AData Compression ParametersThis chapter includes parameter descriptions for data compression services.WCP Line Interface

Configuring Data Compression ServicesA-2117352-B Rev. 00Parameter: Compression ModePath: Configuration Manager > Protocols > WCP > LinesDefau

Data Compression Parameters117352-B Rev. 00A-3 Parameter: History SizePath: Configuration Manager > Protocols > WCP > LinesDefault: 32 KOptio

Configuring Data Compression ServicesA-4117352-B Rev. 00Parameter: Buffer Size**Because X.25 has features that check for errors and prevent data loss,

Data Compression Parameters117352-B Rev. 00A-5 Parameter: Fallback Compression ModePath: Configuration Manager > Protocols > WCP > LinesDefau

Configuring Data Compression ServicesA-6117352-B Rev. 00WCP Circuit Interface ParametersUse the following descriptions to set Bay Networks data compre

Data Compression Parameters117352-B Rev. 00A-7 Parameter: History SizePath: Configuration Manager > Protocols > WCP > InterfacesDefault: Inhe

Configuring Data Compression ServicesA-8117352-B Rev. 00Stac LZS ParameterUse the following parameter description to enable Stac LZS compression.Param

Data Compression Parameters117352-B Rev. 00A-9 PPP Interface Parameters for CompressionThere are two PPP interface parameters for data compression. Yo

117352-B Rev. 00viiModifying the Compression Mode ...3-7Maximizing Throughput ...

Configuring Data Compression ServicesA-10117352-B Rev. 00Parameter: Compression ProtocolPath: Configuration Manager > Protocols > PPP > Inter

117352-B Rev. 00Index-1Bbandwidth-on-demand, description, 2-11buffer size, preventing data loss, 3-11Ccircuit interface parameters, A-6Compression Con

Index-2117352-B Rev. 00Hhardware compressionconfiguring, 1-7contexts, 2-6daughterboards and net modules, 2-5history size, 3-9selecting engines, 3-12hi

117352-B Rev. 00ixFiguresFigure 2-1. CCP and WCP Initialization on a PPP Link ............2-8Figure 3-1. WCP Line In