We have 6513 as core rtrs in our infrastructure. The 'Show ip ospf' o/p showing the rtr ID as :192.168.101.1 on S1 and 192.168.101.2 on S2.
But in our environment we are not using 192.168.101.0 subnet at all.
Also, in the OSPF config , no rtr ID set.
Lo0 interfaces 'UP' with no ip addresses.
no 192.168.101.0 advertised in OSPF.
6513-S2#sh ip ospf
Routing Process "ospf 100" with ID 192.168.101.2
6513-S1#sh ip ospf
Routing Process "ospf 100" with ID 192.168.101.1
This infrastructure has been setup long
time back, do not want to modify anything but curious to know hopw this IP is showing as router ID as whaen it is not existing at all in the config.