9.4 Verifying Dial Backup Configuration
9.4.1 show interface type number command
To verify a backup line link for a primary line connection, enter the show interface type number command. The primary interface output in Figure illustrates that Dialer1 is specified as a backup if the serial subinterface 3/1.1 fails. If the serial link fails, the backup will be enabled 20 seconds later. The backup will deactivate 40 seconds after the serial subinterface reactivates. The backup interface output in Figure shows the backup link in standby mode until the primary line fails.