ospf log error

[Mohammed_Jashee]

Hi,
My ospf link flopping continuously the switch log is showing below mentioned. kindly help as to solve this issue..

09/28/2015 17:04:51.49 Processing DD from neighbor 192.168.99.2 fails on NBR seqmismatch event,case else

[Anonymous]

Hi Jasheer,

I have seen this before and believe this translates to the OSPF neighbor changing state from FULL to EXSTART because of the receipt of a Database Description (DBD) packet from the neighbor with an unexpected sequence number.

SeqNumberMismatch means that a DBD packet during OSPF neighborship negotiation has been received that either:

• has an unexpected DBD sequence number
• unexpectedly has the Iimit bit set
• has an Options field differing from the last Options field received in a Database Description packet.

This can be attributed to (Unidirectional) packet loss as a possible cause.

So I would take a look at the port that the neighbour is connecting through and check for any packet loss.

Thanks.