Avaya Configuring Data Compression Services Manuel d'utilisateur télécharger pdf (Page 45)

Data Compression Overview

117352-D Rev. 00

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The backup circuit can inherit the primary circuit’s configuration, or it can use its

own. When the frame relay primary and backup use the same configuration, they

have a

shared

configuration. The backup circuit uses the same network layer

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 different from the primary.

If the backup uses a unique configuration, it is a

secondary

configuration. 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 circuit 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

Configuring Dial

Services

X.25 Services

An X.25 network permits as many as 128 VCs to exist on the same physical 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 Defense Department 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.

You must also remember to enable the X.25 service record compression parameter

for each X.25 interface that you configure. For more information about this

parameter, see

Configuring X.25 Services

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Avaya Configuring Data Compression Services Manuel d'utilisateur Page 45