S0/0/1
10.1.1.2
10.1.1.3
Internet
provider
Virtual router
10.1.1.1 A.
RouterA(config-if)#standby 1 interface tracking serial 0/0/1
RouterB(config-if)#standby 1 interface tracking serial 0/0/1
RouterA(config-if)#standby 1 tracking serial 0/0/1
RouterB(config-if)#standby 1 tracking serial 0/0/1
RouterA(config-if)#standby 1 track serial 0/0/1
RouterB(config-if)#standby 1 track serial 0/0/1
RouterA(config-if)#interface serial 0/0/1
RouterA(config-if)#standby 1 interface tracking
RouterB(config-if)#standby 1 interface tracking
■
IP Connectivity (Domain 3)