Cisco Systems 2.5 Aux Backup Welcome Window, Backup Configuration

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Cisco Router and Security Device Manager 2.5 User’s Guide
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Chapter5 Configuring WAN Connections
Configuring an Aux Backup Connection
•Summary
Aux Backup Welcome Window
The option to configure the AUX port as a dial-up connection only appears for the
Cisco 831 and 837 routers.
The Aux dial-backup radio button is disabled if any of the following conditions
exist:
•More than one default route exists.
•One default route exists and it is configured with an interface other than the
primary WAN interface.
The Aux dial-backup option is not shown if any of the following conditions exist:
•The router is not using a Cisco IOS image that supports the Aux dial-backup
feature.
•A primary WAN interface is not configured.
•The asynchronous interface is already configured.
•The asynchronous interface is not configurable by Cisco SDM because of the
presence of unsupported Cisco IOS commands in the existing configuration.
Backup Configuration
ISDN BRI and analog modem interfaces can be configured to work as backup
interfaces to other, primary interfaces. In that case, an ISDN or analog modem
connection will be made only if the primary interface goes down for some reason.
If the primary interface and connection go down, the ISDN or ana log modem
interface will immediately dial out and try to establish a connection so that
network services are not lost.
Choose whether this ISDN BRI or analog modem connection should act as a
backup connection.