I am setting up my first DMVPN tunnel and I appear to be having a problem with it.
With EIGRP turned off the tunnel comes right up and works fine. However when I turn up EIGRP the tunnel drops every 15 seconds or so for about 5-10 seconds.
The message on the spoke router is that a goodbye message was received. On the hub router the holding timer expires. Not only does eigrp go down but I can't even pass basic peer to peer traffic over the tunnel, which I can when EIGRP is turned off.
Now this would suggest that, for some reason, one side or the other is not receiving the EIGRP hellos. However I can't imagine for the the life of me why it wouldn't be.
I don't have any filters on the terminating interfaces other than NAT statements on the spoke router.
Has anyone seen anything like this before? I have tried just about every combo of using the split-horizon command and the ip next-hop-self to no avail.
My EIGRP settings on both routers are very basic. Just no auto-summary and the networks.
Any ideas would be great.