Backup using Backup Interfaces

R1 is connected to R2 via 2 links, one of the two links will be active if the first on goes down:



!
hostname r1
!
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet1/0
 ip address 192.168.12.1 255.255.255.0
!

interface FastEthernet2/0
 backup delay 3 60
 backup interface FastEthernet1/0
 ip address 192.168.112.1 255.255.255.0
!
ip route 2.2.2.2 255.255.255.255 192.168.12.2
ip route 2.2.2.2 255.255.255.255 192.168.112.2
!

!
hostname r2
!
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet1/0
 ip address 192.168.12.2 255.255.255.0
!
interface FastEthernet2/0
 ip address 192.168.112.2 255.255.255.0
!
ip route 1.1.1.1 255.255.255.255 192.168.12.1
ip route 1.1.1.1 255.255.255.255 192.168.112.1
!


FastEthernet2/0: 
Backup interface FastEthernet1/0, failure delay 3 sec, secondary disable delay 60 sec,


r1(config-if)#backup ?      
  active     Configure an interface as an active backup
  delay      Delays before backup line up or down transitions
  interface  Configure an interface as a backup
  load       Load thresholds for line up or down transitions

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