We are in a process of re-addressing the loopback IPs of routers/core switches.. I have the OSPF router-id associated with each device, which would need to be changed, post loopback re-addressing.. After I re-address the loopback, and enable routing for this new loopback, We were planning to do the following:
router ospf 100
no router-id 192.168.1.1
router-id 172.16.1.1 (new loopback IP)
Will I loose remote telnet connectivity, when I do this change? Since there are dual routers/switches, we are making sure we come through the other router, to make sure we dont connectivity to router, but:
1) what will happen when i change the ospf router-id? Will it automatically reset the OSPF neighbors, or should we do it manually?
2) Should we also clear the OSPF process for the new router ID to be effective?
Hello Stuey, Lavanya,
in theory the OSPF router-id doesn't need to belong to an interface in the router.It could be a fictious IP address.
So, in theory it is possible to simply do the following:
a) int loop0
ip address new-address 255.255.255.y
b) router ospf 10
network new-address area W
c) clear ip ospf process
Sorry if I've appeared too careful but it is better to stay on the safe side.
So I would test the steps described above in a lab for example but it shouldn't be an issue OSPF reconvergence.
Hope to help