Avaya Data Compression User Manual

Configuring Data Compression Services

BayRS Version 13.10 Site Manager Software Version 7.10

Part No. 117352-D Rev. 00 November 1998

4401 Great America Pa rkw ay 8 Federal S treet Santa Clara, CA 95054 Billerica, MA 01821

and recommendations in this document are believed to be accurate and reliable, but are presented without express or implied warranty. Users must t ak e full re spo nsibility fo r th e ir app lica tio ns o f any products specif i ed in th is d ocum ent . 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.

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All other trademarks and registered trademarks are t he property of their respective owners.

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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 So ftware 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 cl ause at FAR 52.227-19.

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In the interest of improving internal design, operational function, and/or reliability, Bay Networks, Inc. reserves the right to make changes to the pr oducts described in this document without notice.

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117352-D Rev. 00

Bay Networks, Inc. Software License Agreement

NOTICE: Please carefully read this license agre ement 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, retu rn the product, unused and in the origina l shipping container, within 30 days of purchase to obtain a credit for the full purchase price.

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117352-D Rev. 00 iii

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iv 117352-D Rev. 00

Preface

Before You Begin .............................................................................................................xiii

Text Conventions .............................................................................................................xiv

Acronyms ........................... .......................... .......................... ......................... ................. xv

Bay Networks Technical Publications ..............................................................................xvi

How to Get Help .............................................................................................................xvii

Chapter 1 Starting Compres sion

Summary of Bay Networks Data Compression Features ...............................................1-2

Software-Based Data Compression .........................................................................1-2

Hardware-Based Data Compression for the BN Platform ........................................1-3

Previous Hardware-Based Data Compression .........................................................1-4

Preparing a Configuration File for Data Compression ....................................................1-4

Configuring Software Compression ................................................................................1-5

Enabling Compression for PPP ................................................................................1-6

Enabling Compression for Frame Relay ...................................................................1-6

Enabling Compression for X.25 ................................................................................1-8

Configuring Hardware Compression ..............................................................................1-9

Configuring Compression for a BN (FRE-2-060E Processor) ..................................1-9

Configuring Compression for a BN (Octal Synchronous Link Module) ..................1-10

Configuring Compression for an ASN ....................................................................1-11

For More Information ....................................................................................................1-12

Chapter 2 Data Compression Overview

Bay Networks Compression Services ............................................................................2-2

Data Compression Architecture ......................................................................................2-3

LZ-77 Algorithm .......................................................................................................2-3

Hi/fn LZS Algorithm ..................................................................................................2-4

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Compression Control Protocol (CCP) ......................................................................2-4

Bay Networks WAN Compression Protocol (WCP) ..................................................2-4

PPP Hi/fn LZS Compression Protocol ......................................................................2-5

Data Compression Performance ....................................................................................2-5

Hardware Compression ..................................................................................................2-5

Hardware Compression for the BN ..........................................................................2-6

Hardware Compression for the ASN ........................................................................2-6

Hardware Compression Contexts for WCP ..............................................................2-6

Hardware Compression Contexts for Hi/fn LZS .......................................................2-7

How Data Compression Works .......................................................................................2-8

CCP Negotiations ...................................................................................................2-10

WCP Negotiations ..................................................................................................2-10

Data Transmission ..................................................................................................2-11

Compression Features for Specific Protocols ...............................................................2-11

PPP Services .............................................. ....... ...... ....... ...... ...... ....... ...... ....... ...... .2-11

PPP Multiline ........................... ....... ...... ....................................... ...... ....... ...... .2-11

PPP Multilink .................................. ...... ....... ...... ....... ...... ...... ....... ....................2-12

PPP Bandwidth-on-Demand .............................. ....... ...... ...... ...........................2-13

PPP Dial-on-Demand ..................... ...... ....... ...... ....... ...... ...... ....... ....................2-13

PPP Dial Backup .................................. ....... ...... ....... ...... ...... ....... ...... ....... ...... .2 -13

Frame Relay Services ............................................................................................2-14

Frame Relay Hybrid Access ............................................................................2-14

Frame Relay Dial-on-Demand .........................................................................2-14

Frame Relay Dial Backup ................................................................................2-14

X.25 Services .........................................................................................................2-15

X.25 PDN and DDN Services ..........................................................................2-15

Adjusting X.25 Max Window Size ....................................................................2-16

Chapter 3 Customizing Data Compression

Allocating Compression Memory for WCP .....................................................................3-2

Maximizing the Compression Ratio ..........................................................................3-2

Maximizing Throughput ............................................................................................3-3

8 KB History Size ...............................................................................................3-4

32 KB History Size .............................................................................................3-4

History Size with Hardware Compression .........................................................3-4

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Modifying the History Size .................................................................................3-6

Preventing Data Loss for PPP and Frame Relay .....................................................3-7

Customizing Hardware Compression .............................................................................3-9

Selecting Software or Hardware Compression ........................................................3-9

Selecting a Fallback Compression Mode ...............................................................3-11

Changing the Compression Control Protocol ...............................................................3-13

Disabling and Reenabling Compression ................... ...... ....... ...... ...... ....... ....................3-14

Disabling and Reenabling WCP on a Line .................................. ....... ...... ....... ...... .3-1 4

Disabling and Reenabling WCP on a Circuit ............ ....................................... ...... .3-14

Disabling Hi/fn LZS ........................ ....... ...... ....... ...... ....................................... ...... .3-15

Deleting Data Compression from a Router ...................................................................3-16

Appendix A Site Manager Parameters

WCP Line Interface Parameters .................................................................................... A-2

WCP Circuit Interface Parameters ................................................................................. A-8

Hi/fn LZS Interface Parameters ................................................................................... A-11

PPP Interface Parameters for Compression ................................................................ A-14

Appendix B Show Commands for Hardware Compression

show hwcomp all ..................................................................................................... B-2

show hwcomp state ................................................................................................. B-3

show hwcomp stats ................................................................................................. B-3

show hwcomp errors ............................................................................................... B-5

show hwcomp chip .................................................................................................. B-6

show wcp hwcomp all ............................................................................................. B-7

show wcp hwcomp state ......................................................................................... B-8

show wcp hwcomp stats ......................................................................................... B-9

show wcp hwcomp errors ...................................................................................... B-10

show hifn hwcomp all ............................................................................................ B-11

show hifn hwcomp state ........................................................................................ B-12

show hifn hwcomp stats ........................................................................................ B-13

show hifn hwcomp errors ...................................................................................... B-14

show hardware daughter_card .............................................................................. B-14

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vii

Appendix C Monitoring Software Compression Using the BCC show Commands

show wcp lines ..............................................................................................................C-2

show wcp circuits ........................................................................................................... C-2

show wcp vcs ................................................................................................................C-3

show wcp stats all ..........................................................................................................C-4

show wcp stats error1 .................................................................................................... C-4

show wcp stats error2 .................................................................................................... C-5

show hifn circuits ...........................................................................................................C-6

show hifn stats ............................................................................................................... C-6

show hifn stats error ......................................................................................................C-7

Index

viii

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Figures

Figure 2-1. CCP and WCP Initialization on a PPP Link .............................................2-9

Figure A-1. WCP Line Interfaces List Window ........................................................... A-2

Figure A-2. WCP Circuit Interfaces List Window ....................................................... A-8

Figure A-3. Hi/fn LZS Interface List Window ............................................................ A-11

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Tables

Table 1-1. Link Modules Supported by FRE-2-060E Processor with Advanced

Compression Coprocessor Daughterb oard 1 - 3

Table 2-1. Data Compression Algori thm s and Pr oto cols ................................. ...... ...2-3

Table 3-1. Memory Allocation for Software Compression History ............................3-4

Table 3-2. Hardware Compression: 8 KB Contexts ..................................................3-5

Table 3-3. Hardware Compression: 32 KB Contexts ................................................3-5

Table 3-4. Default Compression Type Dependencies ...............................................3-9

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Preface

Data compression

reducing the amouont of bandwidth needed to tr ansport LAN protocols over a wide area. Bay Networ ks® routers and routi ng softw are suppor t data compr ession over frame relay, X.25, and PPP (dial-up or leased lines). This guide describes what you do to start and customize data compression on a Bay Networks router.

This guide describes how to use Site Manager to configur e da ta compre ss ion on a router.

If you are responsible for configuring data compression, you need to read this guide.

If you want to Go to

Start compression. Chapter 1 Learn about data compression services. Chapter 2 Change default settings for compression parameters. Chapter 3 Obtain information about Site Manager parameters (this is the same

information you obtain using Site Manager online Help).

Before You Begin

is a routing feature that elimin at es re dunda ncy in data streams,

Appendix A

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Before using this guide, you must complete the following procedures. For a new router:

• Install the router (refer to the installation guide that came with your router).

• Connect the router to the network and create a configuration file (refer to

Quick-Starti ng Router s, Configuring BaySt ac k Remo te Access ASN Routers to a Network)

, or

Connecting

xiii

Configuring Data Compression Se rvices

Make sure that you are running the latest version of Bay Networks BayRS™ and Site Manager software. For information about upgrading BayRS and Site Manager, see the upgrading guide for your version of BayRS.

Text Conventions

This guide uses the following text conventions:

angle brackets (< >) Indicate that you choose the text to enter based on the

description inside the brackets. Do not type the brackets when entering the command.

Example: If the command syntax is:

ping <

ip_address

ping 192.32.10.12

, you enter:

bold text

italic text

screen text

Indicates command names and options and text that you need to enter.

Example: Enter Example: Use the

show ip {alerts | routes}.

command.

dinfo

Indicates file and directory names, new terms, book titles, and variables in command syntax descriptions. Where a variable is two or more words, the words are connected by an underscore.

Example: If the command syntax is:

show at <

valid_route

is one variable and you substitute one value

for it. Indicates system output, for example, prompts and

system messages. Example:

Set Bay Networks Trap Monitor Filters

xiv

117352-D Rev. 00

Preface

separator ( > ) Shows menu paths.

Example: Protocols > I P ide nti fies the IP option on the Protocols menu.

Acronyms

vertical line (

) Separates choices for command keywords and

arguments. Enter only one of the choices. Do not type the vertical line when entering the command.

Example: If the command syntax is:

show ip {alerts | routes} show ip alerts

show ip routes

, you enter either:

This guide uses the following acronyms:

ACK acknowledgement CCP Compression Control Protocol CPC continuous packet com pression DDN Defense Data Network DLCI data link connection identifier DTR data terminal ready IETF Internet Engineering Task Force

, but not both.

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ILCCP Individual Link Compression Control Protocol ILI intelligent link interface

ISDN Integrated Servic es Digital Network ISDN BRI ISDN Basic Rate interface ISDN PRI ISDN Primary Rate Interface LAPB Link Access Procedure-Balanced LCP Link Control Protocol MCE1 multichannel E1 MCT1 multichannel T1 MIB management information base

Configuring Data Compression Se rvices

NCP Network Control protocol PDN Public Data Network PPC packet-by-packet compression PPP Point-to-Point Protocol PVC permanent virtual circuit RFC Request for Comments VC virtual circuit WAN wide area network WCP WAN Compression Protocol

Bay Networks Technical Publications

You can now print Bay Networks technical manuals and release notes free, directly from the Internet. Go to Bay Networks product for which you need documentation. Then locate the specific category and model or version for your hardware or software product. Using Adobe Acrobat Re ader, you can open the manuals and r eleas e note s, sea rch 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

support.baynetw orks.com/l ibra ry/tp ubs/

. Find the

xvi

You can purchase Bay Networks documentation sets, CDs, and selected technical publications through the Bay Networks Collateral Catalog. The catalog is located on the World Wide Web at into sections arranged alphabetically:

• The “CD ROMs” section lists available CDs.

• The “Guides/Books” section lists books on technical topics.

• The “Technical Manuals” section lists available printed documentation sets. Make a note of the part numbers and prices of the items that you want to order.

Use the “Marketing Collateral Catalog description” link to place an order and to print the order form.

support.baynetworks.com/catalog.html

and is divided

117352-D Rev. 00

How to Get Help

For product assi stance, support contracts, information about educational services, and the telephone numbers of our gl obal supp ort offices, go to the following URL :

http://www.baynetworks.com/corpor ate/ conta cts/

In the United States and Canada, you can dial 800-2LANWAN for assistance.

Preface

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xvii

Chapter 1

Starting Compression

The quickest way to begin using data compression on your network is to enab le it with the default configuration that Bay Networks software supplies. This chapter briefly introduces Bay Networks data compression and includes the procedures for configuring compression with the default configuration values.

This chapter contains the following information:

Topic Page

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Summary of Bay Networks Data Compression Features Preparing a Configuration File for Data Compression 1-4 Configuring Software Compression 1-5 Configuring Hardware Compression 1-9 For More Information 1-12

1-2

1-1

Configuring Data Compression Se rvices

Summary of Bay Networks Data Compression Features

You can configure both software- a nd hardware-based compression on a circuit or line basis. Features specific to software and hardware compression follow.

Software-Based Data Compression

Bay Networks offers two software compression protocols:

• WAN Compression Protocol (WCP) -- for Point-to-Point Protocol (PPP), frame relay, and X.25 links

• Hi/fn LZS -- for PPP links only

The Hi/fn™ LZS® compression option is not included with your initial

Note:

purchase of BayRS. Bay Networks Hi/fn LZS compression software incorporates LZS (licensed from Hi/fn) and therefore must be purchased separately. To run Hi/fn LZS compression on a PPP link between a Bay Networks router and a no n-Ba y Netwo rks rout er, you must obtain a license for the Hi/fn LZS compression software, which is delivered on a separate CD.

1-2

These two protocols use different Lev-Zimpel algorithms to implement compression and provide differen t levels of interoperability between Bay Networks routers and routers made by other vendors.

If both ends of the connection are Bay Networks routers, use WCP as the compression protocol. If the connection is a PPP link and only one end of the connection is a Bay Networks router, use Hi/fn LZS.

Software-based data compression works over WAN links. Specifically, WCP works with PPP, frame relay, and X.25 links; Hi/fn LZS works only with PPP links. Both WCP and Hi/fn LZS work with PPP multilink. WCP also works with PPP multiline.

Software compression includes the following features:

• Support for all Bay Networks platforms: BayStack Access Stack Node (ASN Backbone Node (BN

™

), Advanced Remote Node™ (ARN™),

), and System 5000

™

Access Node (AN®),

• Compression for a Bay Networks Fast Routing Engine (FRE®) module at 4 x 128 KB/s compressed throughput, full duplex; or 512 KB/s aggregate compressed throughput

117352-D Rev. 00

Starting Compression

• Compression for a BayStack AN platform at 2 x 64 KB/s compressed throughput, full duplex; or 128 KB/s aggregate compressed throughput

• Compression on all intelligent link interface (ILI) modules that support serial and ISDN BRI ports

• Compression on MCT1 and MCE1 lines

Hardware-Based Data Compression for the BN Platform

The FRE-2-060E processor module with advanced compression coprocessor daughterboard, available with BayRS Version 12.20 for the BN router platform, extends hardware-based data compression services to the link modules listed in

Table 1-1

Table 1-1. Link Modules Supported by FRE-2-060E Processor with Advanced

Compression Coprocessor Daughterboard

Link Modules Bay Networks Part Number

Octal Sync 5008 Oct Sync, HWComp32 AG2104037 Oct Sync, HWComp128 AG2104038 Dual Port Multi Channel T1 5945 Single Port Multi Channel T1 5944 Dual Port Multi Channel E1 77007 Single Port Multi Channel E1 77009 75 ohm Dual Por t MCE1-II AG2111004 75 ohm Single Port MCE1-II AG2111003 120 ohm Dual Por t MCE1-II AG2111002 120 ohm Single Port MCE1-II AG2111001 DB15 Quad MCT1 AG2111007 Ethernet Sync Advanced Filter 5431

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1-3

Configuring Data Compression Se rvices

The type of data compression you configure depends on the upper layer protocol you want to run over the link, as follows:

• To run frame relay, use WCP.

• To run PPP, use WCP if you are connecting Bay Networks routers. Use Hi/fn LZS if you are connecting routers of different vendors.

Previous Hardware-Based Data Compression

You can continue to use hardware-based data compression services provided by releases earlier than BayRS Version 12.20, which were based on:

• Optional daughterboards for PPP and frame relay networks that use the octal synchronous link module for the BN, using FRE-2 processors only.

If a FRE-2-060E is present in the same slot as an octal synchronous

Note:

hardware compressio n daught erboar d, the FRE-2-060 E will be used inste ad of the octal synchronous daughterboard.

• Optional net modules for PPP and frame relay networks that use the ASN. Hardware compressi on can compr ess dat a transmit ted over WANs attached to the following net modules: dual and quad synchronous, MCE1/ISDN PRI, MCT1/ISDN, dual synchronous with ISDN BRI, and Quad BRI.

Preparing a Configuration File for Data Compression

To configure data c ompressi on, us e the Bay Netw orks Site Manage r con f i guration

1-4

tool. For information about working with configuration files, see

Managing Ro uters with Site Manager, as appropriate

Before starting data compression, you must create and save a configuration file with at least one unconfigured WAN interface, such as a synchronous or MCT1 port.

Configuring and

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Configuring Software Compression

Software compres sion w orks o n all rout er platf orms and al l seri al inte rface s. After you open a configuration file , you can enable compression using Site Manager.

To use Site Manager to configure this interface for compression for PPP, frame relay, or X.25, first complete the following tasks:

Site Manager Procedure

You do this System responds

Starting Compression

1. In the main Site Manager window, choose

Tools.

2. Choose

3. Choose

Dynamic

4. Select the file. The Configuration Manager window

Configuration Manager Local File, Remote File

, or

Cache

. The Configuration Manager menu opens.

The Tools menu opens.

Site Manager prompts you for the configuration file you want to open.

opens, displaying the router modules.

From the Configuration Manager window, proceed to the following sections to configure a WAN protocol and compression.

• Enabling Compression for PPP

on page 1-6

• Enabling Compression for Frame Relay on page 1-6

• Enabling Compression for X.25 on page 1-8

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1-5

Configuring Data Compression Se rvices

Enabling Compression for PPP

To co nfigure software c ompression on a PPP interface , complete the following tasks:

You do this System responds

Site Manager Procedure

1. In the Configuration Manager window, click on the link or net module connector for which you are enabling data compression.

2. Accept the default circuit name or rename the circuit, then click on OK.

3. Choose

4. Click on OK. The Select Protocols window opens.

5. Enable data compression for PPP by choosing one of the fo ll o w in g:

• Choose

Bay Networks router.

• Otherwise, choose

6. Click on OK. You return to the Configuration Manager

as the WAN proto co l. Site Manager enable s the protocol.

PPP

if connecting to anothe r

WCP

Hi/fn LZS

Enabling Compression for Frame Relay

To configure software compression on a frame relay interface, complete the following tasks:

Site Manager Procedure

The Add Circuit window opens.

The WAN Protocols window opens.

Site Manager enables compression on this interface.

window.

1-6

You do this System responds

1. In the Configuration Manager window, click on the link or net module connector for which you are enabling data compression.

2. Accept the default circuit name or rename the circuit, then click on OK.

3. Choose protocol.

Frame Relay

as the WAN

The Add Circuit window opens.

The WAN Protocols window opens.

Site Manager enables the protocol.

117352-D Rev. 00

Starting Compression

Site Manager Procedure

You do this System responds

4. Click on OK. The Select Protocols window opens.

5. Enable data comp ression for frame relay by choosing

6. Click on OK. You return to the Configuration Manager

WCP

(continued)

Site Manager enables compression on this interface.

window.

117352-D Rev. 00

1-7

Configuring Data Compression Se rvices

Enabling Compression for X.25

To en able WCP on an X.25 interface , you must first add an X.25 service record, then enable compr ession fo r the X.25 i nterf ace. See information about X.25 service records.

To en able compress ion on an X.25 interface, com plete the foll owing tasks:

You do this System responds

Site Manager Procedure

Configuring X.25 Ser vices

for

1. In the Configuration Manager window, click on the link or net module connector for which you are enabling data compression.

2. Accept the default circuit name or rename the circuit, then click on OK.

3. Choose

4. Enter the required information, then click on OK.*

5. Click on

6. Enter the required information then click on OK.

7. Choose

8. Choose

9. Choose

10. Set the to

Enable

Do this for each X.25 interface that you configure.

11. Click on

* Site M anager requires that you configure certain packet and service parameters.

Configuring X.25 Services

See

† At the time you enable compression, you can also enable other protocols.

and click on OK. The X.25 Pa cket Configuration window

X.25

. The X.25 Service Record window opens.

Add

Protocols Add/Delete WCP

Enable Compression

Done

. The Protocols menu opens.

. The Select Protocols window opens.

. Site Manager enables compression on

parameter

. You return to the Configuration Manager

for information about these parameters.

The Add Circuit window opens.

The WAN Protocols window opens.

opens. The X.25 Service Configuration window

opens.

You return to the X.25 Service Configuration window.

this interface and then returns you to the X.25 Service Conf iguration wi ndow.†

Site Manager enables compression for this interface.

window.

1-8

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Starting Compression

Configuring Hardware Compression

To us e hardware comp ression for th e BN router, you must have eith er an octal synchronous link module w ith a hardware compression daughterboard or the FRE-2-060E processor module with advanced compression coprocessor daughterboard. For the ASN router, you must have a hardware compression net module.

You can use hardware compression with PPP and frame relay.

Configuring Compression for a BN (FRE-2-060E Processor)

To configure hardware compression for a BN that has a FRE-2-060E processor module with advanced compression coprocessor daughterboard, following tasks:

Site Manager Procedure

You do this System responds

complete the

117352-D Rev. 00

1. In the Configuration Manager window, click on the slot in which the FRE-2-060E processor module with advanced compression coprocessor is installed and choose the link m odule for which you want to enable data compression.

2. Click on OK. You return to the Configuration Manager

3. Choose a port. The Add Circuit window opens.

4. Accept the default circuit name or enter a new name, then click on OK.

5. Choose one of these WAN protocols:

• PPP

•

Frame Relay

6. Click on OK. The Select Protocols window opens.

Site Manager selects the module.

window. The link module is added to the slot.

The WAN Protocols window opens.

Site Manager selects the protocol.

(continued)

1-9

Configuring Data Compression Se rvices

Site Manager Procedure

You do this System responds

7. Enable data compression as follows:

• For frame relay, choose

• For PPP, choose

another Bay Networks router. Otherwise, choose

8. Click on OK. You return to the Configuration Manager

WCP

Hi/fn LZS

WCP

if connecting to

(continued)

Site Manager enables compression on this interface.

window.

Configuring Compression for a BN (Octal Synchronous Link Module)

To configure hardware compression for a BN that has an octal synchronous link module with a hardware compression daughterboard, tasks:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window, click on an empty slot and choose one of the following octal synchronous link modules with a hardware compression daughterboard:

• AG2104037

• AG2104038*

2. Click on OK. You return to the Configuration Manager

3. Choose a port. The Add Circuit window opens.

4. Accept the default circuit name or enter a new name, then click on OK.

5. Choose one of these WAN protocols:

• PPP

•

Frame Relay

6. Click on OK. The Select Protocols window opens.

Site Manager selects the module.

window. The link module is added to the slot.

The WAN Protocols window opens.

Site Manager selects the protocol.

complete the following

(continued)

1-10

117352-D Rev. 00

Starting Compression

Site Manager Procedure

You do this System responds

7. Choose

8. Click on OK. You return to the Configuration Manager

* If you have a hardware compression link module on a BN, you can use hardware compression on

any WAN port on a slot. Hardware compression on the BN does not work across slots.

. Site Manager enables compression on

WCP

Configuring Compression for an ASN

To configure hardware compression for the ASN, complete the following tasks:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window, click on an empty slot and choose one of the following net modules for hardware compression:

• AF2104007

•

AF2104012

2. Click on OK. You return to the Configuration Manager

3. Click on the slot that contains the hardware compression module and choose a WAN net module.

4. Click on OK. You return to the Configuration Manager

5. Choose a port. The Add Circuit window opens.

6. Accept the default circuit name or enter a new name, then click on OK.

7. Choose one of these WAN protocols:

• PPP

•

Frame Relay

(continued)

this interface.

window.

Site Manager selects the net module.

window. The net module is added to the slot.

Site Manager selects the WAN net module.

window. The WAN net module is placed over the compression module.

The WAN Protocols window opens.

Site Manager selects the protocol.

(continued)

117352-D Rev. 00

1-11

Configuring Data Compression Se rvices

You do this System responds

8. Click on OK. The Select Protocols window opens.

9. Choose

10. Click on OK. You return to the Configuration Manager

* If y ou ha ve a hardw are compression net module on an ASN, you can use hardware compression on

any WAN port on that single router or s lot. Hardware compression on the ASN does not work across slots; that is, it does not provide compression for any other ASNs in the stack.

. Site Manager enables compression on

WCP

For More Information

For detailed inf ormation abou t Bay Networks data compression, see Chapter 2, “Data Compression Overview

For information and recommendatio ns about using nondef ault v alues to cus tomize compression, see Chapter 3

Site Manager Procedure

(continued)

this interface.

window.

.”

, “Customizing Data Compression.”

1-12

117352-D Rev. 00

Chapter 2

Data Compression Overview

Bay Networks data compression services enable you to reduce line costs and improve response times over wide area networks. In addition, they eliminate redundancies in data streams. When you use compression on a network, bandwidth efficiency improves so you can transmit more data.

This chapter contains the following information:

Topic Page

117352-D Rev. 00

Bay Networks Compression Services Data Compression Architecture 2-3 Data Compression Performance 2-5 Hardware Compr ession 2-5 How Data Compression Works 2-8 Compression Features for Specif ic Protocols 2-11

2-2

2-1

Configuring Data Compression Se rvices

Bay Networks Compression Services

Bay Networks compression services include:

• Software-based compression for PPP, frame relay, and X.25 networks for all router platforms and all serial interfaces.

PPP compression works on multiline, multilink, on the ISDN BRI and PRI modules, and on lines that use Raise DTR or V.25bis modem interfaces with dial services. Frame relay compression works on multiline and dial backup lines.

• Hardware-based compression for PPP and frame relay networks for BN routers using one of the following modules:

-- Octal synchronous link module using FRE-2 processors

-- FRE-2-060E processor module with the advanced compression

coprocessor daughterboard to which you can connect a broad range of Bay Networks link modules (see “Hardware-Based Data Compression for

the BN Platform” on page 1-3 for the list of supported link modules).

Hardware compression on the BN supports all PPP and frame relay services that WCP software compressio n suppor ts.

2-2

• Hardware-based compression for PPP and frame relay networks for the ASN router.

A compression net mo d ule compresses data transmitted o v er a WAN network by dual and quad synchronous, MCE1/ISDN PRI, MCT1/ISDN, dual synchronous with ISDN BRI, and Quad BRI net modules. Hardware compression on the ASN supports all PPP services that WCP software compression supports.

Bay Networks WCP software- and hardware-based compression interoperate fully because they use the same algorithm.

Hi/fn LZS hardware compress ion is su pporte d by the FRE-2- 060E proc essor with the advanced compression coprocessor daughterboard for the BN when connecting to a router from another vendor that is also running the Hi/fn LZS algorithm.

To use software data compression effectively, you must decide how to allocate memory for this task. The goal is to compress data as much as possible and to transmit the data as quickly as possible without taxing the resources of the router.

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Data Compression Architecture

WCP and Hi/fn LZS use different compression algorithms and protocols. The compression protocol that you choose depends on whether you are communicating with routers from Bay Networks or other vendors.

Data Compression Overview

Table 2-1

lists the algorithms and protocols that Bay Networks uses to provide

data compression services for WCP and Hi/fn LZS.

Table 2-1. Data Compression Algorithms and Protocols

WCP Hi/fn LZS

LZ-77 algorithm Hi/fn LZS algorithm Compression Control Protocol (RFC 1962) Compression Control Protocol (RFC 1962) Bay Networks proprietary WAN

Compression Protocol (WCP)

References the PPP Hi/fn LZS Compression Protocol (RFC 1974) as a guideline

You must ensure that routers at both ends of the connection are using the same compression protocol.

• If both ends of the connection are Bay Networks routers, configure both routers to 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, configure both router s to use Hi/fn LZS.

If you want the router to negotiate which protocol is used, set the Compression Protocol parameter to Any (see page A-15

for the parameter description).

LZ-77 Algorithm

Bay Networks WCP data c ompress ion softw are is based on a L empel-Zi v (LZ-77) algorithm. The algorit hm 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 shorte r than the original strings, thus compressing the data.

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2-3

Configuring Data Compression Se rvices

Hi/fn LZS Algorithm

Hi/fn is a wholly owned subsidiary of Stac, Inc. Bay Networks Hi/fn LZS compression software incorporates LZS from Hi/fn.

Bay Networks Hi/fn LZS compression software is based on the Hi/f n LZS algorithm to transport compressed packets across a PPP link. Hi/fn LZS implements an error detection mechanism, which means that it can detect whether packets are lost during tr ansmission . Hi/fn LZS doe s not retr ansmit pac kets i f the y are lost.

The Hi/fn LZS compression algorithm searches incoming data for redundant data strings and replaces these strings in the outgoing data with encoded tokens of shorter length. Hi/fn LZS creates the encoded tokens from information in a table that the Hi/fn LZS algorithm builds. This table consists of string matches, which point to previous incoming data. As the table is built and tokens are created, subsequent data is compressed based on previous data.

Compression 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 ca pability, which Hi/fn LZS uses but WCP does not. WCP uses its own negotiation mechanism.

Bay Networks WAN Compression Protocol (WCP)

Bay Networks proprietary WAN Compression Protocol (WCP) is an IETF draft standard. WCP enables compression for frame relay and for X.25, and transports compressed packets f or PPP, frame relay, and X.25. WCP negotiates compre ssion mode, history size, and buffer size. For PPP and frame relay, WCP also retransmits packets in the event of packet loss and protects against inadvertent data expansion (LAPB retransmits packets for X.25).

WCP is most effective for sites that have WAN connections operating at relatively low speeds su ch as 56/ 64 KB, where you w an t to ach ie v e da ta compre ssion a t lo w cost and with minimal memory requirements. WCP supports connections up to 512 KB/s on the FRE-040. For networks operating at faster speeds, you should use hardware compression.

2-4

117352-D Rev. 00

PPP Hi/fn LZS Compression Protocol

PPP uses CCP to negotiate how the router uses the Hi/fn LZS Compression Protocol (RFC 1974). Specifically, CCP negotiates the different compression modes that RFC 1974 supports. Bay Networks negotiates only mode 3 and the number of compression histories, of which we support only one history.

RFC 1974 is specif i ed only as an er ror de te ction protoc ol; u nli ke WCP, it does not contain a transmit history. Instead, it relies on upper layer protocols to retransmit data when errors occur.

For more information about compression protocol modes, refer to RFC 1974.

Data Compression Performance

The goals in using data compre ssion are t o achie v e a high compres sion rati o while maximizing throughput. compared to the size of the same data after it is compressed. 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.

Compression ratio

Data Compression Overview

is the size of uncompressed data

Throughput

refers to

The compression ratio varies according to the effectiveness of the compression algorithm, but also according to the characteristics of the data you are transmitting. Data that includes many redundant strings compresses at a high ratio.

Throughput varies according to the num ber of devices in the network through which the data must travel. Throughput is also affected by the compression and decompression process.

Hardware Compression

Bay Networks hardware-based compression works with frame relay and PPP networks. It best serves sites that support T1 or E1 lines, which often concentrate many lower-speed remote connections. The hardware compression facility operates at high speeds and also supports high-density WAN connections. Use hardware compression when you want to achieve high compression ratios and throughput, and also want to conserve router memory for other functions.

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2-5

Configuring Data Compression Se rvices

Hardware Compression for the BN

The BN supports the following compression daughterboards:

• AG2104037 - Octal Sync with a 32-contexts hardware compression daughterboard

• AG2104038 - Octal Sync with a 128-contexts hardware compression daughterboard

• Advanced compression coprocessor daughterboard with 128 or 256 contexts installed on the FRE-2-060E processor module

Hardware Compression for the ASN

The hardware compression net modules for the ASN can compress data transmitted over WAN networks attached to dual and quad synchronous, MCE1/ISDN PRI, MCT1/ISDN, dual synchronous with ISDN BRI, and Quad BRI net modules. One compress ion net module in a single ASN can pro vide hardware compression for all the net modules on that router. It does not provide compression for any other ASN in the stack.

The compression net module is a vailable in both a 32-contexts and a 128-co nte xts version.

The ASN supports the following compression net modules:

• AF2104007 - 32-contexts hardware compression net module

• AF2104012 - 128-contexts hardware compression net module

Hardware Compression Contexts for WCP

2-6

context

circuit (VC). Compression hardware maps a context to specific regions of compression and decompression memory.

• A 32-contexts compression da ughterboard or net module can run comp ression

refers to compression and decompression for a single virtual

simultaneously over 31 continuous packet compression (CPC) contexts, each using an 8 KB history size, with one shared 8 KB packet-by-packet compression (PPC) context.

117352-D Rev. 00

Data Compression Overview

• A 128-contexts compression daughterboard or net module can run compression simultaneously over 127 CPC contexts, each using an 8 KB history size, with one shared 8 KB PPC context.

• A 256-contexts advanced compression coprocessor daughterboard installed on a FRE-2-060E processor module can r un compress ion simult aneously ov er 255 CPC contexts, each using an 8 KB history size, with one shared 8 KB PPC context.

The 32-contexts, 128- conte xt s, and 256-c ontexts daughterboards and net modules differ in their amount of memory.

• The 32-contexts daughterboard and net module have 512 KB compression/ 256 KB decompression.

• The 128-contexts daughter boards and net module have 2 MB compression/ 1 MB decompression.

• The 256-contexts advanced compression coprocessor daughterboard has 4 MB compression/2 MB decompression.

You should plan your netw or k to us e hardw are c ompressi on on th e VCs

Note:

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, all VCs that exce ed the hardware context limit use software compression.

For information about customizing CPC and PPC, see Chapter 3

Data Compression.”

Hardware Compression Contexts for Hi/fn LZS

Hi/fn LZS supports a 2 KB history size and CPC contexts only. Hi/fn LZS does not support PPC contexts.

117352-D Rev. 00

, “Customizing

2-7

Configuring Data Compression Se rvices

How Data Compression Works

To transmit compressed data, the router must complete one or both of the following:

• CCP negotiations (for PPP connections using WCP or Hi/fn LZS)

• WCP negotiations (for PPP, frame relay, and X.25 connections using WCP)

The following sections describe how these negotiations work. As you read these sections, see Figure 2-1 link.

If compression is across a frame relay or X.25 link, the router negotiates only WCP; CCP does not apply.

, which illustrates CCP and WCP initialization on a PPP

2-8

117352-D Rev. 00

Data Compression Overview

Router A Router B

1. PPP interface on network; LCP negotiations complete; begin CCP negotiations:

Send initialization-request Send initialization-request Send initialization-ACK Send initialization-ACK

2. CCP negotiations complete; begin WCP negotiations, including compression mode, history size, and buffer size:

Send initialization-request Send initialization-request Send initialization-ACK Send initialization-ACK

117352-D Rev. 00

3. WCP negotiations complete; begin NCP negotiations:

Send configure-request Send configure-request Send configure-ACK Send configure-ACK

4. NCP open; begin transmitting data:

Send data

DC0001A

Figure 2-1. CCP and WCP Initialization on a PPP Link

2-9

Configuring Data Compression Se rvices

CCP Negotiations

CCP allows the two ends of a PPP connection to negotiate whether to use data compression and, if so, w hich algorithm to use. Both WCP and Hi/fn LZS use CCP to negotiate compression.

If one side of a link requests an algorithm that the other side does not

Note:

support, traffic over the link continues, but in uncompressed form.

In Figure 2-1 configuration and network control protocol negotiations that the Link Control Protocol (LCP) uses to establish a link.

For Hi/fn LZS, CCP also provides the following:

• History reset request messages

• Request acknowledgment messages

These messages help to synchronize the receipt and transmission of the compression and decompression history after a packet is lost. WCP does not use these messages.

For an explanation of LCP negotiations, see

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 ne gotiate 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 fic c ontinues, b ut in uncompre ssed form. All th ree WAN protocols use WCP to negotiate options such as compression mode, hi st ory s iz e, and buffer size.

, negotiations begin when PPP establishes a link. CCP uses the same

Configuring PPP Services.

2-10

Each side of a link running dat a compres sion has a compress or, a decompressor, a compression history, and a retransmission buffer. You can edit WCP parameters for compression mode, history size, and buffer size to optimize compression performance on your network (see “Allocating Compression Memory for WCP on page 3-2

117352-D Rev. 00

”

Data Compression Overview

Data Transmission

For PPP links using WCP, Network Control Protocol (NCP) negotiations and WCP negotiations occur simultaneously. When PPP, NCP, and WCP negotiations are complete, data transmission using compression begins.

For PPP links usin g Hi/fn LZS , data tr ansmis sion usi ng compre ssion begins when CCP and NCP negotiations are complete.

For frame relay an d X.25 lin ks, dat a tran smissi on using compress io n be gins whe n WCP negotiations are complete.

Compression Features for Specific Protocols

Bay Networks data compression services vary in some details according to the WAN protocols that you configure. Read the following sections to learn about how Bay Networks implements data compression for PPP, frame relay, and X.25 services.

PPP Services

You can use software or hardware data compression on all PPP circui ts , including multiline and multilink, bandwidth-on-demand, dial-on-demand, and dial backup lines. When you use compre ssion on a ba ndwidth-on- demand, dial-on -demand, or dial backup circ uit, WCP au tomati cally con fi gures or delet es compress ion as li nes are added to or removed from the circuit.

PPP Multiline

Multiline

data paths. A 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

Services.

117352-D Rev. 00

enables you to configur e a single circ uit consisti ng of one or more WAN

data path

is a logical point-to-point channel; it can be a permanent

Configuring WAN Line

2-11

Configuring Data Compression Se rvices

PPP Multilink

Multilink

consists of a

provides capabilities beyond those of multiline circuits. Multilink

of lines between two peers, consisting of up to four links.

bundle

Multilink allows you to:

• Distribute traffic across the lines in the bundle in amounts roughly proportional to the effective bandwidth of each link.

• Use lines that have different speeds, proportionally distributing traffic over those lines.

• Balance traffic load and restore packet sequence.

• Use switched lines (such as ISDN B channels) as well as leased lines.

• Monitor traffic volume.

Depending on the version of BayRS, the router handles the operation of PPP multilink and WCP differently.

For BayRS Version 12.10 and later, by default the router negotiates WCP above the PPP multilink bundle for new circuits only. Negotiating compression

the bundle

means that data packets are first compr essed and then distributed

above

across the links i n the bundle. The distributi on of traffic occurs once for the entire bundle, so the balance of traffic across the bundle is more accurate. In addition, the router uses less memory for compression.

Routers using BayRS Version 12.10 or later with an older configuration file negotiate WCP below the multilink bundle by default. Negotiating compression

below the bundle

means that data packets are first distributed across the links and then compressed. Compression is done individually for every li nk. 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.

2-12

If you configure a new multilink circuit on a local router running BayRS Version

12.10 or later, and the remote router is running a version earlier than 12.10, you must change the CCP Type parameter from the default (CCP) to ILCCP for the local router and set the PPP Mode to multilink.

For a description of the CCP Type parameter, see page A-14

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Data Compression Overview

PPP Bandwidth-on-Demand

Bandwidth-on-demand

allows a secondary dial-up line to augment a primary leased line when the primary line experiences congestion. Congestion occurs when traff ic vo lume exceeds line capacity. When congestion abates, th e secondary line becomes inactive.

If you configure bandwidth-on-demand and WCP, it affects the bandwidth-on-demand congestion thresholds. These thresholds instruct the router to activate additional links from a multilink bundle to relieve congestion.

For BayRS Version 12.10 and later, when WCP is negotiated above the multilink bundle and the router sends or receives data, it calculates the congestion thresholds based on com pressed data. If WCP is negotiated below the bundle, the router calculates these thresholds based on uncompressed data.

If a router using BayRS Version 12.10 or later is communicating with a router using software earlier than Version 12.10, the routers must negotiate WCP below the bundle, so the thresholds will be based on uncompressed data.

To configure these thresholds, see

Configuring Dial Services

PPP Dial-on-Demand

Dial-on-demand

service enables you to establish a circuit only when you want to transmit and receive data, as opposed to having a leased line, which is always ava il able. By using a circuit on a demand basis, you can signif ic ant ly redu ce yo ur line costs.

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PPP Dial Backup

PPP also allows you to configure

dial backup

service. If a primary PPP line fails and you enabled dial backup, the router automatically establishes a backup line. You cannot enable any protocols, including compression, on a backup circuit, because a backup circuit inherits its protocols from the primary circuit. If the primary circuit uses com pression, then the backup circuit does also.

For more information about Bay Networks dial services, see

Services

Configuring Dial

2-13

Configuring Data Compression Se rvices

Frame Relay Services

You can use software (WCP only) or hardware data compression with frame relay. You can use compress ion with some vi rtua l circ uits ( VCs), and not wi th othe rs, as you choose, both for regular frame relay VCs, and for those you configure in hybrid mode. You can also use compression with dial-o n-demand a nd dial backup services.

You must enable compression on both sides of a frame relay link. If you enable data compression on only one side of the link, data transmission occurs, but in uncompressed form.

Frame Relay Hybrid Access

Hybrid access enables you to combine bridging and routing over a single frame relay interface.

When you enable data compression for frame relay on a hybrid circuit, both the bridged and the routed traffic over that circuit are compressed. Note that compression applies only to the hybrid permanent virtual circuit (PVC), and not to the other PVCs from the main circuit, unless you also enabled compression for those interfaces. Conversely, if you enable data compression for other PVCs, but not on a PVC you configured for hybrid m ode, the hybrid circuit does not use compression.

2-14

Frame Relay Dial-on-Demand

Frame relay enables you to configure dial-on-demand service.

Dial-on-demand

enables the rout er to ac ti v ate a dial-u p line onl y when t here is data to send or whe n you config ure t he rout er t o fo rce t he activation of a dia l-up li ne. Us ing fra me rel ay dial-on-demand ensures t hat you est ablis h connect ions onl y when you need the m, 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 conf ig ure

dial backup

service. If a primary frame rela y 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).

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Data Compression Overview

The backup circuit can inherit the primary circuit’s configuration, or it can use its own. When the fr ame relay primary and backup use the same configuration, they have a

configuration. The backup circuit uses the same network layer

shared

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 differen t from the primary.

If the backup uses a unique configuration, it is a secondary configuration uses a different network layer address, PVCs, and filters from the primary.

To use data compression with frame relay dial backup, you must configure compression on both the primary and the backup circuit. The backup ci rcuit does not necessarily inherit the PVC configuration from the primary circuit, because the backup PVCs can have different configurations from the primary.

For more information about Bay Networks dial services, see

Services

X.25 Services

An X.25 network permits as many as 128 VCs to exist on the same ph ysical 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 Defens e Depa rt ment 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.

secondary

configuration. A

Configuring Dial

117352-D Rev. 00

You must also remember to enable the X.25 ser vice record compr ession paramet er for each X.25 interface that you configure. For more informatio n about this parameter, see

Configuring X.25 Services

2-15

Configuring Data Compression Se rvices

Adjusting X.25 Max Window Size

Window size can affect packet throughput across the X.25 network. Se tting 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 paramet er a t a higher value than the default setting.

2-16

117352-D Rev. 00

Chapter 3

Customizing Data Compression

When you enable data compr ession , de fau lt values are in effect for al l p arameters . This chapter provides information about customizing Bay Networks compression to use it most effectively on your network.

This chapter contains the following information:

Topic Page

Allocating Compression Memory for WCP Customizing Hardware Compression 3-9 Changing the Compression Control Protocol 3-13 Disabling and Reenabling Compression 3-14 Deleting Data Compression from a Router 3-16

3-2

117352-D Rev. 00

3-1

Configuring Data Compression Se rvices

Allocating Compression Memory for WCP

Using WCP across a network involves allocating memory to maximize compression without ta xing t he reso urces of y our rou ter. To achieve this goal, y ou can customize compression parameters to:

• Maximize the compression ratio.

• Maximize throughput.

• Prevent data loss.

Maximizing the Compression Ratio

You can compress data in one of two modes:

•

Continuous packet compression (CPC)

maintains compression history across packets. CPC yields a higher compression ratio than packet-by-packet compression. In most circumstances, you should select CPC, the default value, to maximize compr ess ion.

•

Packet-by-packet compression (PPC)

creates a new history for each packet. PPC yields a lower compression ratio than CPC. Select PPC only for links that drop a very large number of packets. Be aware that under these circumstances, implementing data compression may offer little or no advantage.

If either side of the link specifies PPC, both sides of the link must use PPC.

To specify the compression mode for a line, complete the following tasks:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select a line from the list.

Protocols

WCP Lines

. The WCP menu opens.

. The WCP Line Interfaces List window

Protocols me nu opens

The

opens.

(continued )

3-2

117352-D Rev. 00

Customizing Data Compression

Site Manager Procedure

You do this System responds

5. Set the Click on description on page A-4

6. Click on

Compression Mode

or see the parameter

Help

Done

. You return to the Configuration Manager

parameter.

(continued)

window.

To specify the compre ssion mode for a circuit, comple te the following tasks:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select a circuit from the list.

5. Set the Click on description on page A-9

6. Click on

Protocols

WCP Interfaces

Compression Mode

Help

Done

. The WCP menu opens.

. The WCP Circuit Interfaces List window

parameter.

or see the parameter

. You return to the Configuration Manager

Protocols me nu opens

The

opens.

window.

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 eit her 8 KB or 32 KB of local memory t o maint ain a compress ion history. When you make this choice, be aware that you are allocating more memory than the H istory Size parameter value indicate s.

117352-D Rev. 00

3-3

Configuring Data Compression Se rvices

Table 3-1 lists the amount of memory required for 8 KB and 32 KB history sizes.

Table 3-1. Memory Allocation for Software Compression History

Memory Requirements 8 KB History Size 32 KB History Size

Compression history 8 KB 32 KB Lookup table 16 KB 64 KB Decompression history 8 KB 32 KB Total memory required 32 KB 128 KB

If you select different values for history size for the two sides of the link, 8 KB becomes the history size for both sides of the link.

Hardware compression has similar requirements (see “History Size with

Hardware Compression” on page 3-4).

8 KB History Size

In general, 8 KB histories are appropriate for frame relay and X.25, when you have large numbers of VCs and need to conserve memory for each of them.

3-4

32 KB History Size

For PPP, with only one circuit per line, you may want t o use a 32 KB his tor y. You may also want to al locate a 32 KB history size f or link s with speeds higher t han 64 Kb/s to improve throughput. The compressor can find a data pattern match up to three times faster using a 32 KB history than an 8 KB history.

History Size with Hardware Compression

Hardware compression daughterboards and net modules are available in 32, 128, and 256 contexts. The numbers 32, 128, and 256 assume a history size of 8 KB per context, although you can set the history size to either 8 KB or 32 KB. For example, if y ou set the histo ry si ze to 32 KB, you us e four 8 KB co nte xts, and you have that many fewer contexts available to run hardware compression on your network.

Although software compression does not place strict limits on the

Note:

number of contexts you can configure, memory requirements for history size are the same for both software and hardware compression.

117352-D Rev. 00

Customizing Data Compression

Compression daughterboards reserve one 8 KB context for PPC, as opposed to CPC. There is no limit to the number of VCs that can use th is 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 use s one page of memory. Restrictions for CPC contexts using either 8 KB or 32 KB histories are that the memory used for any one history must be continuous, and that it may not cross pages. F or 8 KB co ntex ts, thes e restrict ions cr eate fe w c onstrai nts, b ut for 32 KB contexts, they are significant.

Table 3-2

shows the maximum number of 8 KB contexts each daughterboard or

net module can support.

Table 3-2. Hardware Compression: 8 KB Contexts

Maximum 8 KB

Daughterboard or Net Module

32-context 31 0 1 128-context 127 0 1 256-conte xt (advanced

compression c oprocessor daughterboard)

Table 3-3

shows the maximum number of 32 KB contexts each daughterboard or

CPC Contexts

255 0 1

Available 32 KB CPC Contexts

Reserved 8 KB PPC Contexts

net module can support.

117352-D Rev. 00

Table 3-3. Hardware Compression: 32 KB Contexts

Maximum 32 KB

Daughterboard or Net Module

32-context 7 3 1 128-context 31 3 1 256-conte xt (advanced

compression c oprocessor daughterboard)

CPC Contexts

63 3 1

Available 8 KB CPC Contexts

Reserved 8 KB PPC Contexts

3-5

Configuring Data Compression Se rvices

You can combine 8 KB and 32 KB contexts on one daughterboard or net module. However, if you bring VCs up and down, memory may fragment. Even when you have 32 KB or more of compression memory available, if it is on different pages you will not be able to configure a 32 KB context. To solve this problem, save your configuration and reset the slot. When you reset the slot, available compression memory is rearranged to be contiguous.

If you have a v ai lable memory, you can always ad d an 8 KB conte xt, because 8 KB is the smallest divisible amount of compression memory.

Modifying the History Size

To mod ify the history size for a l ine, complete the following tasks:

You do this System responds

Site Manager Procedure

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select a line from the list.

5. Set the

Help

page A-5

6. Click on

Protocols

WCP Lines

History Size

or see the parameter description on

Done

. The WCP menu opens.

. The WCP Line Interfaces List window

parameter. Click on

. You return to the Configuration Manager

Protocols me nu opens

The

opens.

window.

3-6

117352-D Rev. 00

Customizing Data Compression

To modify the history size for a circuit, complete the following tasks:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select a circuit from the list.

5. Set the

Help

page A-10

6. Click on

Protocols

WCP Interfaces

History Size

or see the parameter description on

Done

. The WCP menu opens.

. The WCP Circuit Interfaces List window

parameter. Click on

. You return to the Configuration Manager

Protocols me nu opens

The

opens.

window.

Preventing Data Loss for PPP and Frame Relay

Buffer size

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 V ery Large. The default value is Normal. Configure buffer size based on the following conditions:

• Leng th of time it takes for data to travel over the link

is the amount of memory allocated to store the transmission history.

A Normal buffer size is usually large enough for a coast-to-coast connection within the United States. You may need a Large or Very Large buffer if your link is over a satellite connection.

117352-D Rev. 00

• Number of dropped packets For a link with a high number of dr opped pack ets, incr ease the b uf fe r size. F or

a link with a very low number of dropped packets, decrease the buffer size, even to None, to conserve memory.

3-7

Configuring Data Compression Se rvices

• Number of resets For a link with a high number of resets and a low numb er of d rop ped packets,

increase the buffer size. Be aware, however, that a high number of resets may occur for reasons unrelated to buffer size.

X.25 is a reliable protocol, which means that it has features that check

Note:

for errors and prevent data loss. Bay Networks data compressio n software ignores the Buffer Size parameter for X.25.

To modify the buffer size, complete the following tasks:

You do this System responds

Site Manager Procedure

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select a line from the list.

5. Set the

Help

page A-6

6. Click on

Protocols

WCP Lines

Buffer Size

or see the parameter description on

Done

. The WCP menu opens.

. The WCP Line Interfaces List window

parameter. Click on

. You return to the Configuration Manager

Protocols me nu opens

The

opens.

window.

3-8

117352-D Rev. 00

Customizing Hardware Compression

The following issues are specific to hardware compression:

Customizing Data Compression

• Selecting software or hardware compression (described on page 3-9

• Selecting a fallback compression mode (described on page 3-11

Selecting Software or Hardware Compression

When you configure a VC for compression, the default compression type varies (Table 3-4

Table 3-4. Default Compression Type Dependencies

Module Type Default Compression Type

Link module that does not support hardware compression

Link module that supports hardware compression

Net module other than hardware compression net module

Hardware compression net module Hardware Advanced compression coprocessor

daughterboard

Software

Hardware

Software

Hardware

)

117352-D Rev. 00

You can use softw are compr essio n with a h ardw are comp ression daughterbo ard or net module. Bay Networks recommends that you use hardware compression for connections operating at speeds greater than 512 Kb/s. You should specify software compressio n for VCs in excess of the number of contexts your hardw a re compression daughterboard or net module can support.

3-9

Configuring Data Compression Se rvices

To specify hardware or software compression for a line configured with WCP, complete the following tasks:

You do this System responds

Site Manager Procedure

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select a line from the list.

5. Set the

Help

page A-6.

6. Click on

Protocols

WCP Lines

Engine Type

or see the parameter description on

Done

. The WCP menu opens.

. The WCP Line Interfaces List window

parameter. Click on

. You return to the Configuration Manager

Protocols me nu opens

The

opens.

window.

To specify hardware or software compression for a cir cuit configured with WCP, complete the following tasks:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select a circuit from the list.

5. Set the

Help

page A-11

6. Click on

Protocols

WCP Interfaces

Engine Type

or see the parameter description on

Done

. The WCP menu opens.

. The WCP Circuit Interfaces List window

parameter. Click on

. You return to the Configuration Manager

Protocols me nu opens

The

opens.

window.

3-10

117352-D Rev. 00

Customizing Data Compression

To specify hardware or software compression for an interface configur ed with Hi/fn LZS compression, complete the following tasks:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select an interface from the list.

5. Set the

Help

page A-12.

6. Click on

Protocols

Hi/fn LZS Interfaces

Engine Type

or see the parameter description on

Done

. . The Hi/fn LZS menu opens.

. The Hi/fn LZS Interface List window

parameter. Click on

. You return to the Configuration Manager

Selecting a Fallback Compression Mode

The fallback compression mode is the compression mode that you want to use when no hardware compression contexts are available. You can set a fallback compression mode for a WCP line interface or for a Hi/fn LZS interface.

When configuring a WCP line interface, 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 Hardware PPC.

Protocols me nu opens

The

opens.

window.

117352-D Rev. 00

• Hardware PPC -- a good choice for highe r-spe ed links, greater t han 64 Kb/s. It provides better throughput than Software CPC.

• None -- a good choice for very high-speed links.

When configuring a Hi/fn LZS circuit interface, the options are as follows:

• Software CPC -- a good choice for lower-speed links, 64 Kb/s or less.

• None -- a good choice for extremely high-speed links, greater than 2.5 Mb/s.

3-11

Configuring Data Compression Se rvices

To modify the fallback compression mode for a line configured with WCP, complete the following tasks:

You do this System responds

Site Manager Procedure

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select a line from the list.

5. Set the parameter. Click on parameter description on page A-7.

6. Click on

Protocols

WCP Lines

Fallback Compression Mode

Done

. The WCP menu opens.

. The WCP Line Interfaces List window

or see the

Help

. You return to the Configuration Manager

Protocols me nu opens

The

opens.

window.

To modify the fallback c ompre ssi on mode for a Hi/fn LZS interface, complete the following tasks:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select an interface from the list.

5. Set the parameter. Click on parameter description on page A-13

6. Click on

Protocols

Hi/fn LZS Interfaces

Fallback Compression Mode

Done

. . The Hi/fn LZS menu opens.

. The Hi/fn LZS Interface List window

or see the

Help

. You return to the Configuration Manager

Protocols me nu opens

The

opens.

window.

3-12

117352-D Rev. 00

Customizing Data Compression

Changing the Compression Con trol Protocol

The PPP interface p ar amet ers that you can modify for compression are CCP Type and Compression Protocol. These parameters enable the router to operate with Bay Networks routers using router software earlier than Version 12.10 and with non-Bay Networks routers.

Modifying the CCP Type parameter enables a router operating with BayRS Version 12.10 and later t o be compatib le with router s running pr e vious v ersions of BayRS that negotiate W CP below the PPP multilink b undle. F or more informat ion about PPP multilink and how it works with WCP, see “PPP Multilink

page 2-12

Modifying the Compression Protocol parameter lets you specify a particular protocol to use or instructs the router to negotiate which protocol to use.

You can use Site Manager to modify PPP compression parameters. To change the compression control protocol, complete the following tasks:

Site Manager Procedure

” on

117352-D Rev. 00

You do this System responds

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select an interface from the list.

5. Set the

Help

page A-14

6. Set the parameter. Click on parameter description on page A-15

7. Click on

Protocols

PPP Interfaces

CCP Type

or see the parameter description on

Compression Protocol

Done

. The PPP menu opens.

. The PPP Interface Lists window opens.

parameter. Click on

or see the

Help

. You return to the Configuration Manager

The Protocols menu opens.

window.

3-13

Configuring Data Compression Se rvices

Disabling and Reenabling Compression

You can disable compression on a line or circuit, then reenable it later.

Disabling and Reenabling WCP on a Line

To dis able or reenable WCP on a line, complete the following tasks:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select a line from the list.

5. Set the or see the parameter description on

page A-3.

6. Click on

Protocols

WCP Lines

Enable

Done

. The WCP menu opens.

. The WCP Line Interfaces List window

parameter. Click on

. You return to the Configuration Manager

Help

Disabling and Reenabling WCP on a Circuit

To disable or reenable WCP on a circuit, complete the following tasks:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select a circuit from the list.

Protocols

WCP Interfaces

. The WCP menu opens.

. The WCP Circuit Interfaces List window

Protocols me nu opens

The

opens.

window.

Protocols me nu opens

The

opens.

(continued)

3-14

117352-D Rev. 00

Customizing Data Compression

You do this System responds

5. Set the or see the parameter description on

page A-9

6. Click on

Disabling Hi/fn LZS

To disable or reenable Hi/fn LZS on an interface, complete the following tasks:

You do this System responds

1. In the Configuration Manager window, choose

2. Choose

3. Choose

4. Select an interface from the list.

5. Set the or see the parameter description on

page A-12

6. Click on

(continued)

window.

Protocols me nu opens

The

opens.

window.

Site Manager Procedure

parameter. Click on

Enable

Done

. You return to the Configuration Manager

Site Manager Procedure

Protocols

Hi/fn LZS Interfaces

Enable

Done

. . The Hi/fn LZS menu opens.

. The Hi/fn LZS Interface List window

parameter. Click on

. You return to the Configuration Manager

Help

117352-D Rev. 00

3-15

Configuring Data Compression Se rvices

Deleting Data Compression from a Router

To delete compression from all ci rcuits on the router, complete the following tasks:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window, choose

2. Choose

3. Choose

Delete Hi/fn LZS.

4. Click on

Protocols.

WCP Delete WCP

OK.

Hi/fn LZS.

The Protocols menu opens.

The WCP or Hi/fn LZS menu opens. Site Manager prompts you to co nfirm th e

deletion. You return to the Configuration Manager

window. Compression is no longer operating on

the router.

3-16

117352-D Rev. 00

Appendix A

Site Manager Pa rameters

This appendix contains the Site Manager parameter descriptions for data compression services. You can display the same information using Site Manager online Help. This appendix contains the following information:

Topic Page

WCP Line Interface Parameters WCP Circuit Interface Parameters A-8 Hi/fn LZS Interface Parameters A-11 PPP Interface Parameters for Compression A-14

A-2

For each parameter, this appendix provid es the following information:

• Parameter name

• Configuration Manager menu path

• Default setting

• Valid parameter options

• Parameter function

• Instructions for setting the parameter

• Management information base (MIB) object ID

117352-D Rev. 00

A-1

Configuring Data Compression Se rvices

The Technician Interface allows you to modify parameters by issuing

commit

commands with the MIB object ID. This process is equivalent to modifying parameters using Site Manager. For more information about using the Technician Interface to access the MIB, see

Caution:

The Technician Interface does not verify the validity of your

parameter va lues. Entering an invalid value can corrupt your configuration.

WCP Line Interface Parameters

The WCP Line Interfa ces List windo w (Fig ure A-1) contains all data compression line parameters.

and

set

Using Technician Interface Software

A-2

Figure A-1. WCP Line Interfaces List Window

117352-D Rev. 00

Site Manager Parameters

To access the WCP Line Interfaces List window, complete the following tasks:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window, choose

2. Choose

3. Choose

Protocols

WCP Lines

. The WCP menu opens.

. The WCP Line Interfaces List window

Protocols me nu opens

The

opens.

The parameter descriptions follow.

Parameter: Enable

Path: Configuration Manager > Protocols > WCP > Lines

Default: Enable

Options: Enable

Disabl e

Function: Enables or disables data compression on the line.

Instructions: WCP automatically sets this parameter to Enable when you select WCP in the

Select Protocols window. If you want to temporarily disable WCP rather than delete it from the router, set this parameter to Disable. To reenable WCP , reset it to Enable.

MIB Object ID: 1.3.6.1.4.1.18.3.4.22.1.1.2

117352-D Rev. 00

A-3

Configuring Data Compression Se rvices

Parameter: Compression Mode

Path: Configuration Manager > Protocols > WCP > Lines

Default: Continuous Packet

Options: Continuous Packet

Packet by Packet

Function: Specifies the compression mode on the line. Continuous packet compression

(CPC) retains compression history across packets and allows a higher compression ratio than packet-by-packet compression.

Packet-by-packet compression (PPC) resets compression history at the start of each packet, resulting in a lower compression ratio. Because PPC does not depend on pre vious packets, you should select this o pti on f or a link that drops a large number of packets.

Instructions: Select either Continuous Packet or Packet by Packet.

MIB Object ID: 1.3.6.1.4.1.18.3.4.22.1.1.5

A-4

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Site Manager Parameters

Parameter: History Size

Path: Configuration Manager > Protocols > WCP > Lines

Default: 32K

Options: 32K

Function: Specifies the amount of memory allocated to compression history for the line.

Remember that history size has separate compression and decompression histories and lookup tables on each side of a link.

If the link uses software compression with a history of 8 KB, each end of the link allocates a total of 32 KB as follows:

• 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 a lookup table

• 32 KB for decompression Hardware compression has similar requirements. Selecting 32K for PPP WCP should not be a problem for the BN, because PPP

allows only one circuit per line. Select 8K or 32K for frame relay and X.25 lines, depending on the resources of your network.

Selecting 32K fo r PPP WCP on t he ASN can cause pr oblems, part icularl y if you are using a 32-context compression net module.

You may want to alloc at e a 32 KB history size for links with speeds hi ghe r than 64 Kb/s to improve throughput. The compression engine can find a data pattern match up to three times faster using a 32 KB history.

If you select dif f erent histor y sizes for each si de of a link, th e smalle r of the tw o becomes the effective history size.

Instructions: S elect either 32K or 8K.

MIB Object ID: 1.3.6.1.4.1.18.3.4.22.1.1.6

117352-D Rev. 00

A-5

Configuring Data Compression Se rvices

Parameter: Buffer Size

Path: Configuration Manager > Protocols > WCP > Lines

Default: Normal

Options: Very Large

Function: Indicates the amount of buffer memory for the transmission history on a line.

Because X.25 has features that check for errors and prevent data loss, data compression software ignores the Buffer Size parameter for X .25.

Instructions: Set this parameter according to the end-to-end round-trip length of a WCP

connection: Select Normal for most land-line, coast-to-coast connections. Select Large or Very Large for connections at a great distance from each other,

such as sate llite conne ctions. 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.

MIB Object ID: 1.3.6.1.4.1.18.3.4.22.1.1.7

Large | Normal | None

Parameter: Engine Type

Path: Configuration Manager > Protocols > WCP > Lines

Default: Software (unless you conf i gured either an oct al syn chronou s lin k module with a

hardware compression daughterboard or a FRE-2-060E processor module with an advanced compr es sio n co proc es sor daughterboard for the BN, or a hardware compression net module for the ASN, in which case the default is Hardware)

Options: Software

Function: Specifies whether compression for this node will be software-based or

hardware-based.

Instructions: S elect Softwa re to use software-based compression, or select Hardware to use

hardware-based co mpression. You can use hardware compres sio n wi th PPP and frame relay only. You can use software compression with PPP, frame relay, or X.25.

MIB Object ID: 1.3.6.1.4.1.18.3.4.22.1.1.8

A-6

Hardware

117352-D Rev. 00

Site Manager Parameters

Parameter: Fallback Compression Mode

Path: Configuration Manager > Protocols > WCP > Lines

Default: Software CPC

Options: Software CPC

Hardware PPC | None

Function: For hardware compression only, specifies the compression mode that you want

to use when no hardware compression contexts are available. Software CPC is a good choice for lower-speed links, 64 Kb/s or less. It

generally affords a better compression ratio than Hardware PPC. Hardware PPC is a good choice for higher-speed links, greater than 64 Kb/s. It

provides better throughput than Software CPC. None is a good choice for very high-speed links.

Instructions: Select Software CPC, Hardware PPC, or None.

MIB Object ID: 1.3.6.1.4.1.18.3.4.22.1.1.10

117352-D Rev. 00

A-7

Configuring Data Compression Se rvices

WCP Circuit Interface Parameters

The WCP Circuit Interfaces L ist window (Figure A-2) contains the data compression circuit parameters.

A-8

Figure A-2. WCP Circuit Interfaces List Window

To access the WCP Circuit Interfaces List window, complete the following tasks:

Site Manager Procedure

You do this System responds

1. In the Configuration Manager window, choose

2. Choose

3. Choose

Protocols

WCP Interfaces

. The WCP menu opens.

. The WCP Circuit Interfaces List window

Protocols me nu opens

The

opens.

117352-D Rev. 00

Site Manager Parameters

The parameter descriptions follow.

Parameter: Enable

Path: Configuration Manager > Protocols > WCP > Interfaces

Default: Enable

Options: Enable

Function: Enables or disables data compression on the circuit.

Instructions: WCP automatically sets this parameter to Enable when you select WCP in the

Select Protocols window. If you want to temporarily disable WCP rather than delete it from the router, set this par ameter to Disable. Reset it to Enable to reenable WCP.

MIB Object ID: 1.3.6.1.4.1.18.3.4.22.2.1.2

Parameter: Compression Mode

Path: Configuration Manager > Protocols > WCP > Interfaces

Default: Inherit from Line

Options: Continuous Packet

Function: Specifies the compression mode on the circuit.

Disable

Packet by Packet | Inherit from Line

Continuous packet compression (CPC) retains compression history across packets and allows a higher compression ratio than packet-by-packet compression (PPC).

Inherit from Line allows you to set WCP parameters at the line level and apply them to circuits. F or PPP, with only one circuit per line, this means th at you can configure WCP at either the circuit level or the line level.

Instructions: 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.

MIB Object ID: 1.3.6.1.4.1.18.3.4.22.2.1.4

117352-D Rev. 00

A-9

Configuring Data Compression Se rvices

Parameter: History Size

Path: Configuration Manager > Protocols > WCP > Interfaces

Default: Inherit from Line

Options: 32K

8K | Inherit from Line

Function: Specifies the amount of memory allocated to compression history for the line.

Remember that history size has separate compression and decompression histories and l ookup tables on each side of a link. If the l ink 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

• 64 KB for a lookup table

• 32 KB for decompression Hardware compression has similar requirements. Selecting 32K for PPP WCP should not be a problem for the BN, because PPP

allows only one circuit per line. Select 8K or 32K for frame relay and X.25 circuits, depending on the resources of your network. Selecting 32K for PPP WCP on the ASN can cause proble ms, part icul arly i f you are u sing a 32-con te xt compression net module.

In general, 8 KB histories are appropriate for WAN links that run at speeds of 64 Kb/s or less, because less throughput is required. Use an 8 KB history size with frame relay a nd X.25, whic h ha v e la r ge numbe rs of VCs an d may have low availa ble bandwidth, and with PPP on a 32-context net module. You may want to allocate a 32 KB history size for links with speeds higher than 64 Kb/s to improve throughput. The compression engine can find a data pattern match up to three times faster using a 32 KB history. If you select different history sizes for each side of a link, the smaller of the two becomes the effective history size.

Inherit from Line allows you to set WCP parameters at the line level and apply them to circu its.

Instructions: Select Inherit from Line if you want to accept the value in effect for the WCP

History Size line parameter. Otherwise, select either 32K or 8K.

MIB Object ID: 1.3.6.1.4.1.18.3.4.22.2.1.5

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117352-D Rev. 00

Site Manager Parameters

Parameter: Engine Type

Path: Configuration Manager > Protocols > WCP > Interfaces

Default: Inherit from Line

Options: Software

Function: Specifies whether compression for this node will be software-based or

hardware-based.

Instructions: 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 s oftware-bas ed compression or Hardware to use hardware-based compression.

You can use hardware compression with PPP and fra me re la y onl y. Y ou can use software compression with PPP, frame relay, or X.25.

MIB Object ID: 1.3.6.1.4.1.18.3.4.22.2.1.6

Hardware | Inherit from Line

Hi/fn LZS Interface Parameters

The Hi/fn LZS Interface List window (Figure A-3) contains Hi/fn LZS interface parameters.

117352-D Rev. 00

Figure A-3. Hi/fn LZS Interface List Window

A-11

Configuring Data Compression Se rvices

To access the Hi/fn LZS Interface List window, complete the following tasks:

You do this System responds

Site Manager Procedure

1. In the Configuration Manager window, choose

2. Choose

3. Choose

Protocols

Hi/fn LZS Interfaces

. . The Hi/fn LZS menu opens.

. The Hi/fn LZS Interface List window

Protocols me nu opens

The

opens.

The parameter descriptions follow.

Parameter: Enable

Path: Configuration Manager > Protocols > Hi/fn LZS > Interfaces

Default: Enable

Options: Enable

Disable

Function: Enables or disables Hi/fn LZS compression on this interface.

Instructions: Site Manager automatically sets this parameter to Enable when you select Hi/fn

LZS as the compression protocol. If you want to temporarily disable Hi/fn LZS rather than delete it from the router, set this parameter to Disable. To reenable Hi/fn LZS, reset it to Enable.

MIB Object ID: 1.3.6.1.4.1.18.3.4.22.5.1.2

Parameter: Engine Type

Path: Configuration Manager > Protocols > Hi/fn LZS > Interfaces

Default: Software

Options: Software

Hardware

Function: Specifies whether data will be compressed by software or hardware.

Instructions: For hardware compres sion, set this parameter to Hardware.

For software comp ression, set this parameter to Software.

MIB Object ID: 1.3.6.1.4.1.18.3.4.22.5.1.4

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117352-D Rev. 00

Site Manager Parameters

Parameter: Fallback Compression Mode

Path: Configuration Manager > Protocols > Hi/fn LZS > Interfaces

Default: Software CPC

Options: Software CPC

None

Function: When a circuit on this line cannot register for hardware compression due to a

lack of hardware-context memory, this parameter determines whether data will be compressed by software or remain uncompressed.

Instructions: If you want data to be compressed by software on a circuit that cannot register

for hardware compression, set this parameter to S oftware CPC . If you want data to remain uncompressed on a circuit that cannot register for

hardware compression, set this parameter to None. None is a good choice for very high-speed links.

MIB Object ID: 1.3.6.1.4.1.18.3.4.22.5.1.8

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Configuring Data Compression Se rvices

PPP Interface Parameters for Compression

The PPP Interface Lists window contains two parameters for data compression. (For more inform ation about PPP, see

To access the PPP Interface Lists window, complete the following tasks:

Site Manager Procedure

You do this System responds

Configuring PPP Services

1. In the Configuration Manager window, choose

2. Choose

3. Choose

Protocols

PPP Interfaces

. The PPP menu opens.

. The PPP Interface Lists window opens.

The Protocols menu opens.

The PPP parameters for compression are as follows.

Parameter: CCP Type

Path: Configuration Manager > Protocols > PPP > Interfaces

Default: CCP

Options: ILCCP

CCP

Function: Specifies the compression control prot ocol that the router uses for this interf ac e.

Instructions: Accept the def ault, CCP, if you select Hi/fn LZS as the c ompression p rotocol, or

if you select WCP as the compression protocol and you set the PPP Mode parameter to multilink. Using CCP as the compression type means that the router negotiates compression above the multilink bundle.

Select ILCCP if you are configuring a new circuit and you set the PPP Mode parameter to multilink, and the remote router is using router software earlier than Version 12.10. Using ILCCP as the compression ty pe means that t he rou ter negotiates compression below the multilink bundle.

If you have a router running BayRS Version 12.10 or later using an older configuration file, the routers negotiate WCP below the multilink bundle by default. You can change this to CCP for the routers at both ends of the link to negotiate WCP above the multilink bundle.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.2.2.1.71

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117352-D Rev. 00

Site Manager Parameters

Parameter: Compression Prot ocol

Path: Configuration Manager > Protocols > PPP > Interfaces

Default: Any

Options: Any

Function: Specifies the compression protocol that the router uses for this interface.

Instructions: Ac cept the default, Any, if you want the router to automatically select the

WCP

compression protocol that is compatible with the remote router, as follows:

• If the remote router can use eith er WCP or Hi/ fn LZS, the r outer sel ects WCP, for example, if both ends of the connection are Bay Networks routers.

• If the remote router does not use WCP, but uses Hi/fn LZS, the router selects Hi/fn LZS. Conversely, if the remote router does not use Hi/fn LZS, but uses WCP, the router selects WCP.

• If the remote router does not recognize either WCP or Hi/fn LZS, then CCP does not complete negotiations and the router will not compress data.

Select WCP as the compression prot ocol if the remote rou ter is a Bay Netw orks router .

Hi/fn LZS

Select Hi/fn LZS as the compression protocol if the remote router is not a Bay Networks router.

MIB Object ID: 1.3.6.1.4.1.18.3.5.9.2.2.1.72

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A-15

Appendix B

Show Commands for Hard ware Compression

This appendix describes how to use the BCC

command to display

show

information about software compression from the management information base (MIB). The type and amount of data displayed depends on the hardware compression settings you want to view.

Use the BCC show command to display status and statistical information about hardware compression.

This appendix includes descriptions of the following

Command Page

show hwcomp all show hwcomp state show hwcomp stats show hwcomp errors show hwcomp chip show wcp hwcomp all show wcp hwcomp state show wcp hwcomp stats show wcp hwcomp errors show hifn hwcomp all show hifn hwcomp state show hifn hwcomp stats show hifn hwcomp errors show hardware daughter_card

show

commands:

B-2 B-3 B-3 B-5 B-6 B-7 B-8 B-9 B-10 B-11 B-12 B-13 B-14 B-14

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Configuring Data Compression Se rvices

show hwcomp all

The BCC

show hwcomp all

command displays information about active and unused contexts and statistics about compressed and decompressed packets. This command com bines statistics for WCP an d Hi/fn.

The output contains the following information:

Slot/<module> For BN routers either:

• The slot and module number of the FRE-2-060E with Advanced Compression Coprocessor daughterboard

• The slot and module number of the FRE-2 with Octal Sync module (with hardware compression daughterboard)

For ASN routers, the slot and module number of the hardware

compression modul e . State Current operating state of the compression hardware. Hardware

Compression Module Type

Compression Module Chip Type

Active Contexts Number of active contexts by size and type. Unused Contexts Number of unused contexts by size and type. Total Compressed

Packets Total Decompressed

Packets Total Tx Expanded

Packets Tot al Rx

NonCompressed Pac ke ts

Total Compression Errors

Total Decompression Errors

Total LCB Errors Number of Longitudinal Check Byte (LCB) errors.

Type of m odule.

Type of chip.

Number of compressed packets.

Number of decompressed packets.

Number of expanded packets transmitted.

Number of uncompressed packets received.

Number of compression errors.

Number of decompression errors.

B-2

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Show Commands for Hardware Compression

Tot al Tx NonCompressed Pac ke ts

Total Rx Dropped Packets

show hwcomp state

The BCC compression at the instant the command is issued. This command combines statistics f or WCP and Hi/f n.

The output contains the following information:

Slot/<Module> For BN routers either:

State Current operating state of the compression hardware. Hardware

Compression Mod Type

Active Contexts Number of active contexts by size and type. Unused Contexts Number of unused contexts by size and type.

Number of uncompressed packets transmitted.

Number of dropped packets received.

show hwcomp state

• The slot and module number of the FRE-2-060E with Advanced Compression Coprocessor daughterboard

• The slot and module number of the FRE-2 with Octal Sync module (with hardware compression daughterboard)

For ASN routers, the slot and module number of the hardware compression modul e .

Type of m odule.

command displays the status of hardware

show hwcomp stats

The BCC compression at the instant the command is issued. This command combines statistics f or WCP and Hi/f n.

117352-D Rev. 00

show hwcomp stats

command displays statistics about hardware

B-3

Configuring Data Compression Se rvices

The output contains the following information:

Slot/<Module> For BN routers either:

• The slot and module number of the FRE-2-060E with

• The slot and module number of the FRE-2 with Octal Sync

For ASN routers, the slot and module number of the hardware compression modul e .

Total Compressed Packets

Total DeCompressed Packets

Total Tx Expanded Packets

Tot al Rx NonCompressed Pac ke ts

Number of compressed packets.

Number of decompressed packets.

Number of expanded packets transmitted.

Number of uncompressed packets received.

Advanced Compression Coprocessor daughterboard module (with hardware compression daughterboard)

B-4

117352-D Rev. 00

show hwcomp errors

Show Commands for Hardware Compression

The BCC

show hwcomp errors

command displays information about hardware

compression errors. This command combines statistics for WCP and Hi/fn. The output contains the following information:

Slot/<Module> For BN routers either:

• The slot and module number of the FRE-2- 060E with Advanced Compression Coprocessor daughterboard

• The slot a nd module number of the FRE- 2 with Octal Sync module (with hardware compression daughterboard)

For ASN routers, the slot and module number of the hardware compression m odule.

Total Compression Errors

Total Decompression Errors

Total LCB Errors Number of Longitudinal Check Byte (LCB) errors. Tot al Tx

NonCompressed Pac ke ts

Total Rx Dropped Packets

Number of compression errors.

Number of decompression errors.

Number of uncompressed packets transmitted.

Number of dropped packets received.

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Configuring Data Compression Se rvices

show hwcomp chip

The BCC

show hwcomp chip

command identifies the chip type that is

performing hardware compression. The output contains the following information:

Slot/<Module> For BN routers either:

• The slot and module number of the FRE-2- 060E with Advanced Compression Coprocessor daughterboard

• The slot a nd module number of the FRE- 2 with Octal Sync module (with hardware compression daughterboard)

For ASN routers, the slot and module number of the hardware compression m odule.

Chip Type Type of chip performing hardware compre ssion services.

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117352-D Rev. 00

show wcp hwcomp all

Show Commands for Hardware Compression

The BCC

show wcp hwcomp all

command displays informat ion about active

and unused contexts and statistics about compressed and decompressed packets. The output contains the following information:

Slot/<module> For BN routers either:

• The slot and module number of the FRE-2-060E with Advanced Compression Coprocessor daughterboard

• The slot and module number of the FRE-2 with Octal Sync module (with hardware compression daughterboard)

For ASN routers, the slot and module number of the hardware

compression modul e . State Current operating state of the compression hardware. Hardware

Compression Module Type

Compression Module Chip Type

Active Contexts Number of active contexts by size and type. Unused Contexts Number of unused contexts by size and type. Total Compressed

Packets Total Decompressed

Packets Total Tx Expanded

Packets Tot al Rx

NonCompressed Pac ke ts

Total Compression Errors

Total Decompression Errors

Total LCB Errors Number of Longitudinal Check Byte (LCB) errors.

Type of m odule.

Type of chip.

Number of compressed packets.

Number of decompressed packets.

Number of expanded packets transmitted.

Number of uncompressed packets received.

Number of compression errors.

Number of decompression errors.

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Configuring Data Compression Se rvices

Tot al Tx NonCompressed Pac ke ts

Total Rx Dropped Packets

show wcp hwcomp state

The BCC compression at the instant the command is issued.

The output contains the following information:

Slot/<Module> For BN routers either:

State Current operating state of the compression hardware. Hardware

Compression Mod Type

Active Contexts Number of active contexts by size and type. Unused Contexts Number of unused contexts by size and type.

show wcp hwcomp state

Number of uncompressed packets transmitted.

Number of dropped packets received.

command displays the status of hardware

• The slot and module number of the FRE-2-060E with Advanced Compression Coprocessor daughterboard

• The slot and module number of the FRE-2 with Octal Sync module (with hardware compression daughterboard)

For ASN routers, the slot and module number of the hardware compression modul e .

Type of m odule.

B-8

117352-D Rev. 00

show wcp hwcomp stats

Show Commands for Hardware Compression

The BCC

show wcp hwcomp stats

command displays stat istics about hardware

compression at the instant the command is issued. The output contains the following information:

Slot/<Module> For BN routers either:

• The slot and module number of the FRE-2-060E with Advanced Compression Coprocessor daughterboard

• The slot and module number of the FRE-2 with Octal Sync module (with hardware compression daughterboard)

For ASN routers, the slot and module number of the hardware compression modul e .

Total Compressed Packets

Total DeCompressed Packets

Total Tx Expanded Packets

Tot al Rx NonCompressed Pac ke ts

Number of compressed packets.

Number of decompressed packets.

Number of expanded packets transmitted.

Number of uncompressed packets received.

117352-D Rev. 00

B-9

Configuring Data Compression Se rvices

show wcp hwcomp errors

The BCC

show wcp hwcomp errors

command displays information about

hardware compression errors. The output contains the following information:

Slot/<Module> For BN routers either:

• The slot and module number of the FRE-2- 060E with Advanced Compression Coprocessor daughterboard

• The slot a nd module number of the FRE- 2 with Octal Sync module (with hardware compression daughterboard)

For ASN routers, the slot and module number of the hardware compression m odule.

Total Compression Errors

Total Decompression Errors

Total LCB Errors Number of Longitudinal Check Byte (LCB) errors. Tot al Tx

NonCompressed Pac ke ts

Total Rx Dropped Packets

Number of compression errors.

Number of decompression errors.

Number of uncompressed packets transmitted.

Number of dropped packets received.

B-10

117352-D Rev. 00

show hifn hwcomp all

Show Commands for Hardware Compression

The BCC

show hifn hwcomp all

command displays informat ion about acti v e and

unused contexts and statistics about compressed and decompressed packets. The output contains the following information:

Slot/<module> For BN routers either:

• The slot and module number of the FRE-2-060E with Advanced Compression Coprocessor daughterboard

• The slot and module number of the FRE-2 with Octal Sync module (with hardware compression daughterboard)

For ASN routers, the slot and module number of the hardware

compression modul e . State Current operating state of the compression hardware. Hardware

Compression Module Type

Compression Module Chip Type

Active Contexts Number of active contexts by size and type. Unused Contexts Number of unused contexts by size and type. Total Compressed

Packets Total Decompressed

Packets Total Tx Expanded

Packets Tot al Rx

NonCompressed Pac ke ts

Total Compression Errors

Total Decompression Errors

Type of m odule.

Type of chip.

Number of compressed packets.

Number of decompressed packets.

Number of expanded packets transmitted.

Number of uncompressed packets received.

Number of compression errors.

Number of decompression errors.

117352-D Rev. 00

B-11

Configuring Data Compression Se rvices

Tot al Tx NonCompressed Pac ke ts

Total Rx Dropped Packets

show hifn hwcomp state

The BCC compression at the instant the command is issued.

The output contains the following information:

Slot/<Module> For BN routers either:

State Current operating state of the compression hardware. Hardware

Compression Mod Type

Active Contexts Number of active contexts by size and type. Unused Contexts Number of unused contexts by size and type.

show hifn hwcomp state

Number of uncompressed packets transmitted.

Number of dropped packets received.

command displays the status of hardware

• The slot and module number of the FRE-2-060E with Advanced Compression Coprocessor daughterboard

• The slot and module number of the FRE-2 with Octal Sync module (with hardware compression daughterboard)

For ASN routers, the slot and module number of the hardware compression modul e .

Type of m odule.

B-12

117352-D Rev. 00

show hifn hwcomp stats

Show Commands for Hardware Compression

The BCC

show hifn hwcomp stats

command displays statistics abou t hardware

compression at the instant the command is issued. The output contains the following information:

Slot/<Module> For BN routers either:

• The slot and module number of the FRE-2-060E with Advanced Compression Coprocessor daughterboard

• The slot and module number of the FRE-2 with Octal Sync module (with hardware compression daughterboard)

For ASN routers, the slot and module number of the hardware compression modul e .

Total Compressed Packets

Total DeCompressed Packets

Total Tx Expanded Packets

Tot al Rx NonCompressed Pac ke ts

Number of compressed packets.

Number of decompressed packets.

Number of expanded packets transmitted.

Number of uncompressed packets received.

117352-D Rev. 00

B-13

Configuring Data Compression Se rvices

show hifn hwcomp errors

The BCC

show hifn hw c om p e r rors

command displays informat ion about

hardware compression errors. The output contains the following information:

Slot/<Module> For BN routers either:

• The slot and module number of the FRE-2- 060E with Advanced Compression Coprocessor daughterboard

• The slot a nd module number of the FRE- 2 with Octal Sync module (with hardware compression daughterboard)

For ASN routers, the slot and module number of the hardware compression m odule.

Total Compression Errors

Total Decompression Errors

Tot al Tx NonCompressed Pac ke ts

Total Rx Dropped Packets

Number of compression errors.

Number of decompression errors.

Number of uncompressed packets transmitted.

Number of dropped packets received.

show hardw are daughter_ca rd

The BCC hardware that is performing compression services.

The output contains the following information:

Slot Number of the slot in which the FRE-2-060E with Advanced

Card Type Type o f compression hardware. Revision Version of the advanced compression coprocessor

Serial No. Identification number assigned to the advanced compression

B-14

show hardware daughter_card

Compression Coprocessor daughterboard is located.

daughterboard.

coprocessor daughterboard.

command displays information about

117352-D Rev. 00

Appendix C

Monitoring Software Compression

Using the BCC show Commands

This appendix describes how to use the BCC

command to display

show

information about software compression from the management information base (MIB). The type and amount of data displayed depends on the software compression settings you want to view.

This appendix includes descriptions of the following

Command Page

show wcp lines show wcp circuits show wcp vcs show wcp stats all show wcp stats error1 show wcp stats error2 show hifn circuits show hifn stats show hifn stats error

show

commands:

C-2 C-2 C-3 C-4 C-4 C-5 C-6 C-6 C-7

117352-D Rev. 00

C-1

Configuring Data Compression Se rvices

show wcp lines

The

show wcp lines

configured for lines on the router. The output includes the following information:

Channel Number Number of the channel on which WCP compression is

Slot/<Mod>/ Connector

State State of WCP compression on the line: Enabled or Disabled. Compression Mode The compression mode operating on the line: continuous packet

History Size The amount of memory allocated to compression history for the

Buffer Size The amount of buffer memory for transmission history on the line Configured Engine

Type

show wcp circuits

command displays information about WCP compressio n

configured. The line identified by slot number, modu le type, and connector

number.

compression (CPC), pack et-b y-pac ket compression (PPC), or th e mode inherited from the line.

line.

The type of compression operating on the line: hardware or software.

C-2

The

show wcp circuits

command displays information about WCP compression

operating on the circuit. The output includes the following information:

Circuit Name Circuit name of the interface. State State of WCP compression on the circuit: Enabled or Disabled. Compression Mode The compression mode operating on the line: continuous packet

compression (CPC) or packet-by-packet compression (PPC).

History Size The amount of memory allocated to compression history for the

circuit.

Configured Engine Type

The type of compression operating on the circuit: hardware or software.

117352-D Rev. 00

show wcp vcs

Monitoring Software Compression Using the BCC show Commands

The

show wcp vcs

command displays informat ion about virtual circuits running

WCP compression. The output includes the following information:

Slot/<Mod>/ Connector

Channel Number Number of the channel on which this virtual circuit is running. Circuit Name Circuit name of the interface. Vc Id Identification of the virtual circuit. Compression State State of the compression software on the virtual circuit:

Decompression State State of the decompressing software on the virtual circuit:

Actual Comp Mode Compression mode operating on the circuit: continuous packet

Actual Hist Size Amount of memory allocated to compression history for the

Actual Engine Type Type of c ompression operating on the circuit: hardware or

Interface identified by slot, module, and connector.

• data (dat a is being compressed)

• disabled (compression software is inoperative)

• disconnected (compression is not connected to the virtual circuit)

• init (compression software is initializing)

• nak (compression software is returning a negative acknowledgment)

• data (data is being decompressed)

• disabled (decompression software is inoperative)

• disconnected (decompression is not connected to the virtual circuit)

• init (decompression software is initializing)

• rexmit (decompression software is ret ransmitting)

• reset (decompression software has been reset)

• connecting (decompression software is connecting to the virtual circuit)

• disconnecting (deco mpressi on softw are is d isconnecti ng from the virtual circuit)

compression (CPC) or packet-by-packet compression (PPC).

circuit.

software.

117352-D Rev. 00

C-3

Configuring Data Compression Se rvices

show wcp stats all

The

show wcp stats all

command displays statistical information about the

performance of WCP compression on the circuit. The output includes the following information:

Slot/<Mod>/ Connector

Channel Number The number of the channel on which this virtual circuit is running. Circuit Name Circuit name of the interface. Vc Id Identification of the virtual circuit. Compression Ratio Ratio of number of bytes received by the WCP compression

Decompression Ratio Ratio of number of bytes received by the WCP deco mpression

Compressor In Number of packets received by the comp ressor. Compressor Out Number of packets transmitted from the compressor. Decompressor In Number of packets received by the decompressor. Decompressor Out Number of packets transmitted from the decompressor. CPC pkts Number of CPC packets transmitted (Tx) and received (Rx). PPC pkts Number of PPC packets transmitted (Tx) and received (Rx)..

The interfac e identified by slot, module, and connector.

software to the number of bytes transmitted by it.

show wcp stats error1

The

show wcp stats error1

conditions for WCP compression on the connection. The output includes the following information:

Channel Number The number of the channel on which this virtual circuit is running. Circuit Name Circuit name of the interface. Vc Id Identification of the virtual circuit. Anti-Expanded

Packets (Tx) Anti-Expanded

Packets (Rx)

C-4

command displays information about error

Number of anti-expanded packets transmitted.

Number of anti-expanded packets received.

117352-D Rev. 00

Monitoring Software Compression Using the BCC show Commands

Data Out of Sequence Number of instances registered of the data-out-of-sequence

Rexmit Out of Sequence

Rexmit Time-Outs Number of timeout messages retransmitted. Exceeded Ks Number of times that K was exceeded. (WCP maintains a

show wcp stats error2

condition. Number of times that an acknowledgment was retransmitted out

of sequence.

transmit history of data pac k et s f or a sp ecifie d r ange ca lled “K.” A packet can be retransmitted if it remains in the range of packets kept in the transmit history. If a packet is outside the range specified by K, it cannot b e retransmitt ed.

The

show wcp stats error2

command displays information about error

conditions pertaining to WCP compression on the connection. The output includes the following information:

Channel Number The number of the channel on which this virtual circuit is running. Circuit Name Circuit name of the interface. Vc Id Identification of the virtual circuit. Reset Packets (Tx) Number of reset packets transmitted. Reset Packets (Rx) Number of reset packets received. Re-transmit Request

(Tx) Re-transmit Request

(Rx) Re-transmit Naks (Tx) Number of negative acknowledgments transmitted Re-transmit Naks (Rx) Number of negative acknowledgments received

Number of retransmit request packets transmitted.

Number of retransmit request packets received.

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C-5

Configuring Data Compression Se rvices

show hifn circuits

The

show hifn circui ts

to operate Hi/fn compression. The output includes the following information:

Circuit Name Circuit name of the interface. State State of Hi/fn compression on the circuit: Enabled or Disabl ed. Configured Engine

Type

show hifn stats

The

show hifn sta t s

performance of Hi/Fn compression on the circuit. The output includes the following information:

Circuit Name Circuit name of the interface. Compression Ratio Ratio of number of bytes received by the Hi/fn compression

Decompression Ratio Ratio of number of bytes received by the Hi/fn decompression

Compressor In Number of packets received by the comp ressor. Compressor Out Number of packets transmitted from the compressor. Decompressor In Number of packets received by the decompressor. Decompressor Out Number of packets transmitted from the decompressor. CPC Packets (Tx) Number of CPC packets transmitted. CPC Packets (Rx) Number of CPC packets received.

command displays information about circuits configured

The type of compression operating on the circuit: hardware or software.

command displays statistical information about the

software to the number of bytes transmitted by it.

C-6

117352-D Rev. 00

Monitoring Software Compression Using the BCC show Commands

show hifn stats error

The

show hifn stats error

command displays information about error conditions

for Hi/fn compression on the connection. The output includes the following information:

Circuit Name Circuit name of the interface. Expanded Pkts (Tx) Number of expanded packets transmitted. Expanded Pkts (Rx) Number of expanded packets received. Reset Requests (Tx) Number of reset requests transmitted. Reset Requests (Rx) Number of reset requests received.

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C-7

Avaya Data Compression User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Configuring Data Compression Services

Contents

Figures

Tables

Preface

Before You Begin

Text Conventions

Acronyms

Bay Networks Technical Publications

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Summary of Bay Networks Data Compression Features

Software-Based Data Compression

Hardware-Based Data Compression for the BN Platform

Previous Hardware-Based Data Compression

Preparing a Configuration File for Data Compression

Configuring Software Compression

Enabling Compression for PPP

Enabling Compression for Frame Relay

Enabling Compression for X.25

Configuring Hardware Compression

Configuring Compression for a BN (FRE-2-060E Processor)

Configuring Compression for a BN (Octal Synchronous Link Module)

Configuring Compression for an ASN

For More Information

Bay Networks Compression Services

Data Compression Architecture

LZ-77 Algorithm

Hi/fn LZS Algorithm

Compression Control Protocol (CCP)

Bay Networks WAN Compression Protocol (WCP)

PPP Hi/fn LZS Compression Protocol

Data Compression Performance

Hardware Compression

Hardware Compression for the BN

Hardware Compression for the ASN

Hardware Compression Contexts for WCP

Hardware Compression Contexts for Hi/fn LZS

How Data Compression Works

CCP Negotiations

WCP Negotiations

Data Transmission

Compression Features for Specific Protocols

PPP Services

PPP Multiline

PPP Multilink

PPP Bandwidth-on-Demand

PPP Dial-on-Demand

PPP Dial Backup

Frame Relay Services

Frame Relay Hybrid Access

Frame Relay Dial-on-Demand

Frame Relay Dial Backup

X.25 Services

X.25 PDN and DDN Services

Adjusting X.25 Max Window Size

Allocating Compression Memory for WCP

Maximizing the Compression Ratio

Maximizing Throughput

8 KB History Size

32 KB History Size

History Size with Hardware Compression

Modifying the History Size

Preventing Data Loss for PPP and Frame Relay

Customizing Hardware Compression

Selecting Software or Hardware Compression

Selecting a Fallback Compression Mode

Changing the Compression Con trol Protocol

Disabling and Reenabling Compression

Disabling and Reenabling WCP on a Line

Disabling and Reenabling WCP on a Circuit

Disabling Hi/fn LZS

Deleting Data Compression from a Router

WCP Line Interface Parameters

WCP Circuit Interface Parameters

Hi/fn LZS Interface Parameters

PPP Interface Parameters for Compression