05-25-2006 05:32 AM - edited 03-03-2019 03:22 AM
Hi all,
can someone help to explain the error messages seen below and possible steps to fix the problem.
May 8 08:20:16: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.130 on Vlan5 from FULL to EXSTART, SeqNumberMismatch
May 8 08:20:16: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.130 on Vlan5 from EXSTART to EXCHANGE, Negotiation Done
May 8 08:20:16: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.130 on Vlan5 from EXCHANGE to LOADING, Exchange Done
May 8 08:20:16: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.130 on Vlan5 from LOADING to FULL, Loading Done
May 8 11:37:41: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.130 on Vlan5 from FULL to EXSTART, SeqNumberMismatch
May 8 11:37:41: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.130 on Vlan5 from EXSTART to EXCHANGE, Negotiation Done
May 8 11:37:41: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.130 on Vlan5 from EXCHANGE to LOADING, Exchange Done
May 8 11:37:41: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.130 on Vlan5 from LOADING to FULL, Loading Done
Thanks in advance
Sanjay
05-25-2006 08:16 AM
Your link/network between the two routers seems to be droppig packets.
Thanks.
05-25-2006 08:36 AM
Hello Sanjay,
Take a look at this url:
<http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0d.shtml>
In addition, the OSPF RFC 2328 , section 10.3, states that the exstart/exchange process is initiated for any of these events (any of which could be caused by internal software problems):
SequenceNumberMismatch
Unexpected DD Sequence number
"I" bit is set unexpectedly
Option field different from the last option field received in the DBD packet
I would suggest clearing your ospf processes and restart the neighborship from scratch. But, before you do that just make sure the routers are still show the problem by examining the output from show ip ospf neighbor.
hth
Ajaz Nawaz
05-30-2006 07:55 AM
01-07-2012 08:45 AM
This might help too
http://www.ietf.org/mail-archive/web/ospf/current/msg03050.html
01-07-2012 11:43 AM
From: http://www.cisco.com/en/US/partner/tech/tk365/technologies_q_and_a_item09186a0080094704.shtml#q45
(Unidirectional) packet loss is a possible cause.A. The OSPF neighbor was changed 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 Init bit set
- has an Options field differing from the last Options field received in a Database Description packet.
regards,
Leo
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