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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