Avaya Configuring Data Compression Services Bedienungsanleitung PDF herunterladen (Seite 39)

Data Compression Overview

117352-B Rev. 00

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PPP Multilink and WCP

Depending on the version of Bay Networks router software, the router handles the

operation of PPP multilink and WCP differently.

For BayRS

™

12.10, by default the router negotiates WCP above the PPP multilink

bundle for new circuits only. Negotiating compression above the bundle means

that data packets are first compressed and then distributed across the links in the

bundle. The distribution of traffic occurs once for the entire bundle and the

balance of traffic across the bundle is more accurate. In addition, the router uses

less memory for compression.

Routers using BayRS 12.10 with an older configuration file negotiate WCP below

the multilink bundle by default. By negotiating compression below the bundle,

data packets are first distributed across the links and then compressed.

Compression is done individually for every link. You can reconfigure the circuit to

negotiate WCP above the bundle by changing the CCP Type parameter to CCP on

the routers at both ends of the link.

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

12.10 and the remote router is running a version earlier than 12.10, you must

change the CCP Type parameter from the default to ILCCP for the local router and

set the PPP Mode to multilink.

For a parameter description of CCP Type, refer to Appendix A, “Data

Compression Parameters.”

PPP Bandwidth-on-Demand

Bandwidth-on-demand allows a secondary, dial-up line to augment a primary,

leased line when the primary line experiences congestion. Congestion occurs

when traffic volume exceeds line capacity. When congestion abates, the secondary

line 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 12.10, when WCP is negotiated above the multilink bundle and the

router sends or receives data, it calculates the congestion thresholds based on

compressed data. If WCP is negotiated below the bundle, the router calculates

these thresholds based on uncompressed data.

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Avaya Configuring Data Compression Services Bedienungsanleitung Seite 39