Hi all, I have a little bit of a problem understanding the output of some ospf show commands and I was wondering if someone here can help me. Basically I don't understand why the loopback int is showing up on the output command. (see attached configuration and results of show commands)
Thank you very much in advance for your help.
I don't understand why the loopback int is showing up on the output command.
It's the concept of the OSPF router-ID where the router selects the highest loopback interface, if available, or the highest IP address of any of the physical interfaces as router-ID.
Here is a good tutorial: