We run EIGRP over GRE/IPSec tunnels to lots of remote routers. We have seen this EIGRP neighbor instability issue, more at some locations and less at others. Frequently one side drops the neighbor relationship and sends a "goodby" to the neighbor. I assume that it has to do with packet loss dropping some of the EIGRP hello messages. We found that by increasing the EIGRP timers we reduced the frequency with which we see the problem (we are using 15 and 45 rather than the default 5 and 15).
** aslo check tunnel interface MTU size:)
"If no hellos are received within the hold time, which is 15 seconds by default on most links, the router informs the neighbor that the neighbor relationship has been torn down and logs a syslog message."
1. Send a stream of 10000 count, once using 100 byte and once using 1500 byte packets,using extended
ping, to the neighbor's directly connected interface IP address. Are there any packet drops or time
Does the neighbor respond if you ping the EIGRP multicast address 18.104.22.168?
2. Perform "debug eigrp packet hello" on both routers to verify that the neighbors are ending and receiving EIGRP hello packets.
Check the routing table entry to verify the next-hop address is correct for the neighbor.
3. Other possibilities that can bring the neighbor relationship down are unidirectional links, uncommon subnet mismatches, mismatched masks, layer 2 problems, ACL deny statement, etc.
Thanks all for your help, but in our organisations true to form ways, Our staff have moved out of that shared building and we've been looking into a fault for users that don't exist. It's now shut down.
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