After a township DCI stitch change, Site A learns remote MACs for a tenant VNI but Site B never installs the corresponding EVPN MAC routes from Site A. What is the most likely conceptual problem?
Select an answer to reveal the explanation.
Short Explanation
A one-way MAC view is like a two-way street where only one side painted the lane lines. Stitch membership has to export and import the right EVPN routes on both borders. If Site B never takes Site A’s routes, the control-plane join is incomplete.
Full Explanation
Successful stitching requires reciprocal EVPN route exchange for the intended tenant overlays—both sides must export and import the relevant routes. Asymmetric membership yields MACs or prefixes visible on one fabric only. Flooding alone, claiming Type-2 cannot cross DCI, or blaming UDP 4789 as unable to work with EVPN misses the control-plane membership issue.