Avaya Configuring Data Compression Services Manual de usuario descargar pdf (Pagina 48)

Configuring Data Compression Services

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117352-E Rev 00

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).

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.

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Avaya Configuring Data Compression Services Manual de usuario Pagina 48