I was toying around with a topology that I created to experiment with OER. I had a Y shaped topology, with a central router that had three spokes. The bottom router would originate pings to a Loopback address that was configured on both the other spoke routers. The central router had a default route via spoke 1 and a default route with a worse AD via spoke 2. pings responded fine and debug ip packet showed all packets going to router on spoke 1 as expected. I downed the Loopback interface expecting pings to fail, with the idea being I could then set up oer to fix this. However the pings failed over seamlessly. I had not configured any thing clever to achieve this.
Experimenting more I re-enabled the Loopback, I set the default routes to the same AD. No load balancing was observed but I assumed this was due to it load balancing via src and dst ip that were consistent. It still however failed over seamlessly. Where is this intelligence coming from? O bi c c Sent from my iPhone _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
