Configuring LO0 on SW4 (Native)

Configuring LO0 on SW4 (Native)

SW4(config)#interface loopback0

SW4(config-if)#ip address 172.16.227.1 255.255.255.255

SW4(config-if)#end

SW4#

In each of the loopback configuration examples, the loopback interface is administratively up and the line protocol is up even though no active ports are configured on the switch. This again is because loopback interfaces are special and cannot go down unless administratively shut down. This is not true for VLAN interfaces because of a feature called autostate. It is important to understand how autostate operates, as you learn in the next section.