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Cisco1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
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Configuring Dial Backup and Remote Management
The Cisco 1800 integrated services fixed-configuration routers support dial-in (for remote management)
and dial-out (for dial backup) capabilities. By allowing you to configure a backup modem line
connection, the Cisco 1800 integrated services fixed-configuration routers provide protection against
WAN downtime. Dial backup is inactive by default, and must be configured to be active.
Dial backup and remote management functions are configured through the ISDN S/T port of the
Cisco 1812, Cisco 1801, Cisco 1802, and Cisco1803 routers. These functions are configured through
the V.92 modem port of the Cisco1811 router.
This chapter contains the following topics:
•Dial Backup Feature Activation Methods
•Dial Backup Feature Limitations
•Configuring Dial Backup and Remote Management Through the ISDN S/T Port
•Configuring Dial Backup and Remote Management Through a V.92 Modem

Dial Backup Feature Activation Methods

Three methods are available to activate the dial backup feature:
•Backup Interfaces
•Floating Static Routes
•Dialer Watch

Backup Interfaces

When the router receives an indication that the primary line is down, a backup interface is brought up.
You can configure the backup interface to go down once the primary connection has been restored for a
specified period.
This is accomplished using dial-on-demand routing (DDR). When this is configured, a backup call is
triggered by specified traffic.