Avaya Configuring Data Compression Services Manuel d'utilisateur télécharger pdf (Page 44)

Configuring Data Compression Services

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117352-D Rev. 00

Frame Relay Services

You can use software (WCP only) or hardware data compression with frame relay.

You can use compression with some virtual circuits (VCs), and not with others, as

you choose, both for regular frame relay VCs, and for those you configure in

hybrid mode. You can also use compression with dial-on-demand and dial backup

services.

You must enable compression on both sides of a frame relay link. If you enable

data compression on only one side of the link, data transmission occurs, but in

uncompressed form.

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 mode, the hybrid circuit does not use

compression.

Frame Relay Dial-on-Demand

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

Dial-on-demand

enables the router to activate a dial-up line only when there is data to send or when

you configure the router to force the activation of a dial-up line. Using frame relay

dial-on-demand ensures that you establish connections only when you need them,

as opposed to using leased lines, which are active regardless of data activity. This

helps you reduce line costs.

Frame Relay Dial Backup

Frame relay enables you to configure

dial backup

service. If a primary frame relay

circuit fails and you enable dial backup, the router automatically establishes a

backup circuit. The backup circuit can be a PPP circuit, a frame relay circuit that

uses direct mode (a service record with only one PVC), or a frame relay circuit

that uses group mode (a service record with two or more PVCs).

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Avaya Configuring Data Compression Services Manuel d'utilisateur Page 44