OSPF Weird Issue

Hi all
I got this log message when i m doing OSPF labs

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?

What is meant by OSPF NonNeighbor and unknown neighbor?

Blogs and organic groups at http://www.ccie.net
Received on Mon Jun 13 2011 - 11:28:29 ART