Avaya Configuring Data Compression Services Bedienungsanleitung PDF herunterladen (Seite 32)

Configuring Data Compression Services

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Compression Features for Speciﬁc Protocols

Bay Networks data compression services vary in some details according to the

WAN protocols you conﬁgure. Read the following sections to learn about how our

implementation of data compression applies to Frame Relay, PPP, and X.25

services.

Frame Relay Services

You can use software- or hardware-based data compression with Frame Relay

interfaces that you conﬁgure to operate in group access, direct access, or hybrid

access mode.

Group Access

When you enable data compression for Frame Relay in group access mode, every

virtual circuit in the group uses compression. Each member of the group has its

own compression history, however, so you may want to select a history size of

8 KB when you conﬁgure data compression in group mode.

Direct Access

When you use Frame Relay in direct access mode, you conﬁgure each permanent

virtual circuit (PVC) individually, and each VC has its own compression history,

so you may want to select a history size of 8 KB. You can use data compression

with some PVCs and not with others.

Hybrid Access

Hybrid access mode combines group and direct access modes for use in

nonmeshed networks that use both bridging and routing over a single Frame Relay

interface. Hybrid access enables you to use PVCs in group mode for routing while

simultaneously using the same PVCs for bridging.

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 that PVC, and not to the other PVCs from the main

circuit, unless you have also enabled compression in group mode for that

interface. Conversely, if you enable data compression in group mode, but not on a

PVC you have conﬁgured for hybrid mode, the hybrid circuit does not use

compression.

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Avaya Configuring Data Compression Services Bedienungsanleitung Seite 32