Verifying the Dial Backup Configuration

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Backup Interface_

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© 2004 Cisco Systems, Inc. All rights reserved. bcran v2.1—9-4

To verify a backup line link for a primary line connection, enter the show interface type number command.

The primary interface output in the figure illustrates that dialer 1 is specified as a backup if the serial subinterface 3/1.1 fails. If the line protocol on the subinterface goes down because of the Local Management Interface (LMI) state changing from ACTIVE to INACTIVE or DELETED, the backup will be enabled 20 seconds later. The backup will deactivate 40 seconds after the serial subinterface reactivates.

The backup interface output shows the backup link in standby mode until the primary line subinterface line protocol goes down.

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