Hello there,
I am seeing odd behavior in the dmvpn tunnels. I have a HUB and Spoke topology running EIGRP protocol. The network was stable for a long time but recently I started seeing that spoke side tunnels go down on their own and to bring it up, I have to bounce the tunnel. There is no other way it comes back. The error I see is as follows -
Mar 14 22:28:17.032: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.100.100.100 (Tunnel100) is down: holding time expired
Mar 15 07:14:50.578: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.100.100.100 (Tunnel100) is down: holding time expired
Mar 15 07:32:01.494: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.100.100.100 (Tunnel100) is down: holding time expired
Mar 15 07:42:50.620: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.100.100.100 (Tunnel100) is down: holding time expired
Mar 15 07:49:21.035: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.100.100.100 (Tunnel100) is down: holding time expired
Mar 15 07:53:39.951: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.100.100.100 (Tunnel100) is down: holding time expired
Mar 15 07:59:55.942: %DUAL-5-NBRCHANGE: EIGRP-IPv4 1: Neighbor 10.100.100.100 (Tunnel100) is down: holding time expired
Some of the routers have dual tunnels ( meaning primary and secondary tunnels on the same router but in two separate vrf) and some of the sites have two separate routers. Wherever I have two separate routers, the secondary does not have an issue. but the primary goes down.
