Avaya Configuring Dial Services Manual do Utilizador descarregar pdf (Página 43)

100

101

Dial Services Overview

117353-B Rev. 00

1-15

Circuit Backup versus Link Backup

When you select PPP or frame relay as the protocol for the backup circuit, you

determine whether the router performs circuit backup or link backup.

Circuit backup is a point-to-point backup connection. One circuit is backed up at a

time, instead of an entire interface. When you back up a point-to-point primary

circuit (Standard, PPP, or a single frame relay PVC), the protocol for the backup

circuit is PPP.

Figures 1-6

and 1-7 show examples of circuit backup. Figure 1-6 shows a

Standard primary circuit aided by a PPP backup circuit. Figure 1-7

shows a PPP

primary circuit aided by a PPP backup circuit.

Figure 1-6. PPP Backup over a PSTN

Note:

For circuit backup of a single frame relay PVC, the backup line passes

through the PSTN network only, bypassing the frame relay network.

Router

Remote site C

Modem

Remote site B

Central site A

Modem

Note: If either primary line fails, the modem at

Central site A can connect to router B or C via a backup circuit.

PSTN

Modem

DS0020A

Primary line

Backup line

Key

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