R0106-HP MSR Router Series High Availability Configuration Guide(V7)

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[RouterA-Serial2/1/0] backup interface serial 2/1/1 30
[RouterA-Serial2/1/0] backup interface serial 2/1/2 20
# Set both up and down delay timers to 10 seconds.
[RouterA-Serial 2/1/0] backup timer delay 10 10
Verifying the configuration
# Display states of the primary and backup interfaces.
[RouterA-Serial 2/1/0] display interface-backup state
Interface: S2/1/0
UpDelay: 10 s
DownDelay: 10 s
State: UP
Backup interfaces:
S2/1/1 Priority: 30 State: STANDBY
S2/1/2 Priority: 20 State: STANDBY
The output shows that Serial 2/1/0 is in UP state and the two backup interfaces are in STANDBY state.
# Shut down the primary interface Serial 2/1/0.
[RouterA-Serial 2/1/0] shutdown
# Verify that the backup interface Serial 2/1/1 comes up 10 seconds after the primary interface goes
down.
[RouterA-Serial 2/1/0] display interface-backup state
Interface: S2/1/0
UpDelay: 10 s
DownDelay: 10 s
State: DOWN
Backup interfaces:
S2/1/1 Priority: 30 State: UP
S2/1/2 Priority: 20 State: STANDBY
Strict active/standby interface backup with the Track module
configuration example
Network requirements
As shown in Figure 4, configure a track entry to monitor the link state of Serial 2/1/0. When the link of
Serial 2/1/0 fails, the backup interface Serial 2/1/1 comes up to take over.