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.
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