
114062 Rev. A
9-1
Chapter 9
Configuring Backup Circuits
To configure backup service, you designate an existing leased circuit as a primary
circuit, and if this circuit fails, the router provides a backup circuit. If you have not
configured a leased circuit, the Dialup > Backup Circuits option is grayed out.
Refer to T
able 9-1 for the appropriate instructions on configuring backup circuits.
Table 9-1. Dial Backup Options
Primary Circuit Protocol
Backup Circuit
Protocol Instructions to Use
Standard PPP (async or sync) Confi
guring PPP over Backup
Circuits on page 9-2
PPP PPP (async or sync) Configuring PPP over Backup
Circuits on page 9-2
Frame Relay -- backing up
only one PVC
PPP (async or sync) Configuring Frame Relay over
Backup Circuits on page 9-13
Frame Relay -- backing up
the entire interface
Frame Relay Configuring Frame Relay over
Backup Circuits on page 9-13
Note:
You cannot configure a bandwidth-on-demand circuit as a primary
circuit.
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