I’ve been working with OTV and Fabricpath and I thought I’d put a few pointers down that I learned that had me scratching my head for a while.
1. To makes sure that OTV is working, the join interfaces on each side must be able to ping each other. Let’s say that site A has join interface 192.168.101.1 and site B has a join interface 192.168.102.1. Before OTV can work, from the OTV VDC, you need to make sure that they can ping each other. This will usually mean that routing is set up properly.
2. For Fabricpath to work with OTV, I had my main aggregation VDC connected to the OTV VDC through an M1 interface. This doesn’t work. Instead, connect the OTV VDC to the aggregation VDC through an F1 interface. This makes it so Fabricpath is terminated and moved into classical ethernet. I scratched my head for probably 4 hours last night until I thought of trying that this morning. Lessons learned.
Hopefully that helps someone.