ok I thought I fully understood the use of loopback addresses but I have one question I notice during an IP accounting I see that my core routers loopback address talk to the edge routers loopback address. the question is what is the reason why the loopback addresses would be talking to each other?
I mean when I do an IP accounting I see the source as my core router loopback and the destination is one of the edge routers loopback address. At first I thought this is because of the tacacs and logginging purposes but then I see the edge loopback addresses going to the tacacs server ip address so not sure why there is a loopback to loopback communication on the routers with each other?
Thank you in advance