Possible Causes of OSPF Neighbor Down

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NumberInformation   that is displayed in the logDescription
1Hello   Not Seenno   Hello packet is received.
2Interface   Parameter Mismatchthe   parameters set on both ends of the link do not match.
3Logical   Interface State Changethe   status of the logical interface changes.
4Physical   Interface State Changethe   status of the physical interface changes.
5OSPF   Process Resetthe   OSPF process restarts.
6Area   resetthe   area restarts because the area type changes.
7Area   Option Mis-matchthe   area options of the interfaces on both ends of the link do not match.
8Vlink   Peer Not Reachablethe   neighbor on the virtual link is not reachable.
9Sham-Link   Unreachablethe   neighbor on the sham link is not reachable.
10Undo Network Commandthe network command   is deleted.
11Undo   NBMA Peerthe   neighbor configuration on the NBMA interface is deleted.
12Passive Interface Downthe   neighbor relationship goes Down because   the silent-interface command is configured on the local interface.
13Opaque   Capability EnabledOpaque   capability is enabled.
14Opaque   Capability DisabledOpaque   capability is disabled.
15Virtual   Interface State Changethe   status of a virtual link interface changes.
16BFD   Session Downthe   BFD session goes Down.
17Down   Retransmission Limit Exceedthe   number of retransmission times reaches the limit.
181-Wayhello   Receivedthe   device receives 1-way hello packets.
19Router   State Change from DR or BDR to DROTHERthe   interface state machine changes to DROTHER from DR or BDR.
20Neighbor   State Change from DR or BDR to DROTHERthe   neighbor state machine changes to DROTHER from DR or BDR.
21NSSA   Area Configure Changethe   configuration of the NSSA area changes.
22Stub   Area Configure Changethe   configuration of the Stub area changes.
23Received   Invalid DD Packetinvalid   DD packets are received.
24Not   Received DD during RouterDeadIntervalno   DD packet is received during the time when the Dead timer starts.
25M,I,MS   bit or SequenceNum Incorrectthe   M, I, and MS bits do not comply with specifications in the protocol.
26Unable   Opaque Capability,Find 9,10,11 Type LsaType9,   Type10, and Type11 LSAs are received and that Opaque capability is disabled.
27Not   NSSA,Find 7 Type Lsa in Summary Listthis   area is not an NSSA and that Type 7 LSAs are found in the summary table.
28LSrequest   Packet,Unknown ReasonLSR   packets are received with an unknown reason.
29NSSA   or STUB Area,Find 5 ,11 Type Lsathis   area is an NSSA or a Stub area and that Type 5 and Type11 LSAs are found.
30LSrequest   Packet,Request Lsa is Not in the Lsdbthe   neighbor sends an LSR to this process or area to request an LSA and that this   LSA does not exist in the LSDB of this process.
31LSrequest   Packet, exist same lsa in the Lsdbthis   process receives an LSA that is same as that in the LSDB and that the LSA is   found in the request list of the neighbor.
32LSrequest   Packet, exist newer lsa in the Lsdbthis   process receives a new LSA that exists in the local LSDB and that the LSA is   found in the request list of the neighbor.
33Neighbor   state was not full when LSDB overflowthe   LSDB overflows and that the neighbor state machine is not Full.
34Filter   LSA configuration changethe   configuration of LSA filter changes.
35ACL   changed for Filter LSAthe   ACL configuration of LSA filter changes.
36Reset   Ospf Peerthe   OSPF neighbor is restarted.


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