From: Darby Weaver (darbyweaver@yahoo.com)
Date: Fri Dec 07 2007 - 21:49:38 ART
Resetting OSPF neighbors on frame relay.
Consider a fully-meshed frame-relay network with three
routers. The three routers are connected to the the
frame relay cloud with the IP addresses 10.10.10.1,
10.10.10.2 and 10.10.10.3 respectively. However, the
neighbor relationship on all the routers constantly
keeps getting reset with messages like the following -
*Mar 4 16:10:01.333: %OSPF-5-ADJCHG: Process 100, Nbr
10.10.10.3 on Serial2 from LOADING to FULL, Loading
Done
*Mar 4 16:10:05.261: %OSPF-5-ADJCHG: Process 100, Nbr
10.10.10.3 on Serial2 from FULL to DOWN, Neighbor
Down: Adjacency forced to reset
*Mar 4 16:10:05.521: %OSPF-4-NONEIGHBOR: Received
database description from unknown neighbor 10.10.10.3
*Mar 4 16:10:08.813: %OSPF-5-ADJCHG: Process 100, Nbr
10.10.10.2 on Serial2 from EXSTART to DOWN, Neighbor
Down: Adjacency forced to reset
*Mar 4 16:10:11.485: %OSPF-4-NONEIGHBOR: Received
database description from unknown neighbor 10.10.10.2
*Mar 4 16:10:12.593: %OSPF-5-ADJCHG: Process 100, Nbr
10.10.10.3 on Serial2 from LOADING to FULL, Loading
Done
*Mar 4 16:10:14.905: %OSPF-5-ADJCHG: Process 100, Nbr
10.10.10.3 on Serial2 from FULL to DOWN, Neighbor
Down: Adjacency forced to reset
*Mar 4 16:10:19.013: %OSPF-5-ADJCHG: Process 100, Nbr
10.10.10.2 on Serial2 from EXCHANGE to DOWN, Neighbor
Down: Adjacency forced to reset
Given just this information, can you determine what
the problem might be here?
Now I found this in a blog, but I just had this
problem in my own lab and it bothered me so much I had
to fix it. I thought I had a bad WIC or a bad cable
or even my frame switch had a bad serial interface at
first.
What do you think will fix it?
Consider carefully, in the lab this would drive you
nuts.
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