Calling all OTV experts
I have configured Multihomed OTV in a virtual lab on EVE-NG using Cisco CSR's. The lab is 2 x CSR at one site both connected to layer2 'customer' switch and a single CSR at a remote site.
Everything works good apart from one thing. At the dual router site, when I drop the OTV WAN/Overlay interface on the CSR/R1 active for my extended VLAN, the remote mac appears in the CSR/R2 bridge-domain (as it should) but the 'customer' layer 2 switch mac address table still shows the mac address as facing the CSR/R1 LAN interface. After 5 minutes the mac table times out and the extended VLAN traffic works again over the CSR/R2 path.
Is there any way R1/R2 can update the customer L2 switch when the remote mac moves over to R2 to make the failover quicker?
I did read a Cisco article that said if spanning tree is enabled on the OTV routers, it will send out a TCN when the overlay drops which will update the 'customer' L2. I have spanning tree enabled on the OTV routers but when I drop the OTV WAN/Overlay interface, it does not send out a TCN, I had debug running on the CSR and wireshark running but no TCN.
I can give access to the lab if it will help the right person understand/fix the issue.
Thanks
Rick