Avaya Configuring Data Compression Services Manuel d'utilisateur télécharger pdf (Page 43)

Data Compression Overview

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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 Version 12.10 and later, when WCP is negotiated above the multilink

bundle and the router sends or receives data, it calculates the congestion

thresholds based on compressed data. If WCP is negotiated below the bundle, the

router calculates these thresholds based on uncompressed data.

If a router using BayRS Version 12.10 or later is communicating with a router

using software earlier than Version 12.10, the routers must negotiate WCP below

the bundle, so the thresholds will be based on uncompressed data.

To configure these thresholds, see

Configuring Dial Services

PPP Dial-on-Demand

Dial-on-demand

service enables you to establish a circuit only when you want to

transmit and receive data, as opposed to having a leased line, which is always

available. By using a circuit on a demand basis, you can significantly reduce your

line costs.

PPP Dial Backup

PPP also allows you to configure

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 compression, then the backup circuit does also.

For more information about Bay Networks dial services, see

Configuring Dial

Services

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Avaya Configuring Data Compression Services Manuel d'utilisateur Page 43