Strict active/standby interface backup with the Track module configuration example

As shown in Figure 4, configure a track entry to monitor the link state of GigabitEthernet 1/0/1. When the link of GigabitEthernet 1/0/1 fails, the backup interface GigabitEthernet 1/0/2 comes up to take over.

1. Assign IP addresses to interfaces, as shown in Figure 4. (Details not shown.)

2. Configure routes:

   # On Router A, configure static routes to 192.168.2.0/24 through the primary and backup interfaces.

   <RouterA> system-view
   [RouterA] ip route-static 192.168.2.0 24 gigabitethernet 1/0/1 1.1.1.2
   [RouterA] ip route-static 192.168.2.0 24 gigabitethernet 1/0/2 2.2.2.2
   

   # On Router B, configure static routes to 192.168.1.0/24.

   <RouterB> system-view
   [RouterB] ip route-static 192.168.1.0 24 gigabitethernet 1/0/1 1.1.1.1
   [RouterB] ip route-static 192.168.1.0 24 gigabitethernet 1/0/2 2.2.2.1
   

3. On Router A, configure track settings:

   # Configure track entry 1 to monitor the link state of GigabitEthernet 1/0/1.

   [RouterA] track 1 interface gigabitethernet 1/0/1
   

   # Associate track entry 1 with the backup interface GigabitEthernet 1/0/2.

   [RouterA] interface gigabitethernet 1/0/2
   [RouterA-GigabitEthernet1/0/2] backup track 1
   [RouterA-GigabitEthernet1/0/2] quit
   

# Verify that the backup interface GigabitEthernet 1/0/2 is in STANDBY state while the primary link is operating correctly.

[RouterA] display interface-backup state
IB Track Information:
  GE1/0/2                   Track: 1    State: STANDBY

# Shut down the primary interface GigabitEthernet 1/0/1.

[RouterA] interface gigabitethernet 1/0/1
[RouterA-GigabitEthernet1/0/1] shutdown

# Verify that the backup interface GigabitEthernet 1/0/2 comes up after the primary link goes down.

[RouterA-GigabitEthernet1/0/1] display  interface-backup state
IB Track Information:
  GE1/0/2                   Track: 1    State: UP