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114062 Rev. B 10-1
Chapter 10
Customizing Backup Circuits
The router activates a backup circuit when a leased circuit fails. To configure
backup service, you designate a leased circuit as a primary circuit. This
designation tells the router to activate a backup circuit if the leased circuit fails. If
you have not configured a leased circuit, the Dialup > Backup Circuits option is
not available.
You should have set up a backup pool according to the instructions in Chapter 1,
and, for PPP configurations only, added PPP backup circuits.
This chapter describes how to configure and customize backup circuits for Frame
Relay, PPP, and Standard primary circuits. Refer to Chapter 6 for a complete
description of Frame Relay and PPP backup service.
T
able 10-1 lists the instructions you should use to configure backup circuits.
You cannot configure a bandwidth-on-demand circuit as a primary circuit.
Table 10-1. Dial Backup Configurations
Primary Circuit Protocol
Backup Circuit
Protocol Instructions
Standard PPP (async or sync) “Creating Backup Circuits,” Chapter 1
PPP PPP (async or sync)
Frame Relay backing up
only one PVC
(
circuit backup
)
PPP (async or sync) Creating a PPP Bac
kup Circuit for
One Frame Relay PVC,” page 10-2
Frame Relay backing up
the entire interface
(
link backup
)
Frame Relay Creating F
rame Relay Backup
Circuits for Multiple PVCs,” page 10-5
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