DMVPN spoke-to-spoke communication failure between 2 spokes
Hi everyone, bit of a complex issue here with two of my DMVPN spoke routers. I have approx. 80 dmvpn spoke routers that connect to a DMVPN hub. Everything is working fine on all spoke routers where they are able to ping each other and building dynamic spoke-to-spoke tunnels. However there are 2 spokes that won't communicate with one another. They can ping all other spokes but each other. Routing seems to be ok as both spokes know each other via their respective tunnels however can't ping/communicate with one another. I noticed when I ping any other spoke, they quickly talk to the DMVPN head-end, obtain the NBMA IP address of the target spoke, and build a dynamic tunnel to that IP. However they never build a tunnel among each other. Currently there are no ACLs in place anywhere (for troubleshooting).
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...