ospg loopback config question

c_g

I need some clarification. It is my understanding that no matter what the highest ip on any interface is, if a loopback ip is set, the loopback address becomes the RID. Correct? Wrong? Thanks, c__g

walid97

Exactly.
When a loopback (logical) IP is set, it has the highest priority over any physical interface IP. Loopback IP is used because it will never go down, so we are sure that the RID will remain up.

to set a loopback IP on a router:
Router(config)# int loopback 0
Router(config-if)#ip address <IP> <mask>

Hope this helps.
Cheers!