01-14-2008 10:00 AM - edited 03-03-2019 08:15 PM
I have a DMVPN hub and spoke network. EIGRP neighbor adjacencies are established through the GRE tunnel. Sometime I get the following log:
%DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 10.91.18.173 (Tunnel0) is down: holding time expired
Why is my GRE tunnel go down just because the neighbor adjacency is lost? Thanks
01-14-2008 10:08 AM
Please share your config.
01-14-2008 03:02 PM
Thia message is generated when you onfiguer eigrp-log-neighbor-changes in the EIGRP process, so you will be able to tell when your neighbor are having issues. There are reason other than a link failuer that will generate these messages. have a look at the document below from cisco concerning these messages it should help you understand them better. the route loss is normal on a GRE tunnel because EIGRP does not trust neighbors that exceed the timer. HTH
1. %DUAL-5-NBRCHANGE: [chars] [dec]: Neighbor [chars] ([chars]) is [chars]: [chars]
A neighbor has gone up or down.
Recommended Action: No action is required
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008010f016.shtml
01-14-2008 08:12 PM
Michael
I believe that there are two different issues possibly involved and that your question blurs the distinction between the issues. One issue is whether the EIGRP neighbor relationship is going down and the other issue is whether the GRE tunnel is going down.
The error message in your post indicates that the EIGRP neighbor relationship running over the tunnel has gone down and it appears that the reason is that the neighbor has missed too many keepalives. This may indicate some amount of packet loss over the GRE tunnel.
The question that your post asks is why your GRE tunnel is going down. But I do not see anything in the post that indicates that the GRE tunnel has really gown down.
HTH
Rick
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide