Cisco Systems OL-6426-02 Benutzerhandbuch
13-2
Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
OL-6426-02
Chapter 13 Configuring Dial Backup and Remote Management
Dial Backup Feature Activation Methods
Note
Even if the backup interface comes out of standby mode (is brought up), the router does not trigger the
backup call unless it receives the specified traffic for that backup interface.
backup call unless it receives the specified traffic for that backup interface.
Configuring Backup Interfaces
Perform these steps to configure your router with a backup interface, beginning in global configuration
mode:
mode:
Floating Static Routes
Floating static routes provide alternative routes for traffic. Floating static routes are not activated unless
a DDR backup call has been triggered by specified traffic for a backup interface.
a DDR backup call has been triggered by specified traffic for a backup interface.
Floating static routes are independent of line protocol status. This is an important consideration for
Frame Relay circuits because the line protocol may not go down if the data-link connection identifier
(DLCI) is inactive. Floating static routes are also encapsulation independent.
Frame Relay circuits because the line protocol may not go down if the data-link connection identifier
(DLCI) is inactive. Floating static routes are also encapsulation independent.
Note
When static routes are configured, the primary interface protocol must go down in order to activate the
floating static route.
floating static route.
Command
Purpose
Step 1
interface type number
Example:
Router(config)# interface atm 0
Router(config-if)#
Enters interface configuration mode for the
interface for which you want to configure backup.
interface for which you want to configure backup.
This can be a serial interface, ISDN interface, or
asynchronous interface.
asynchronous interface.
The example shows the configuration of a backup
interface for an ATM WAN connection.
interface for an ATM WAN connection.
Step 2
backup interface interface-type
interface-number
interface-number
Example:
Router(config-if)# backup interface bri 0
Router(config-if)#
Assigns an interface as the secondary, or backup
interface.
interface.
This can be a serial interface or asynchronous
interface. For example, a serial 1 interface could
be configured to back up a serial 0 interface.
interface. For example, a serial 1 interface could
be configured to back up a serial 0 interface.
The example shows a Basic Rate Interface
configured as the backup interface for the ATM 0
interface.
configured as the backup interface for the ATM 0
interface.
Step 3
exit
Example:
Router(config-if)# exit
Router(config)#
Enters global configuration mode.