What Are the Meanings of Common OSPF Logs Highlighted

Created Sep 07, 2018 15:41:07Latest reply Oct 30, 2018 17:46:34 945 8 10 0
What are the meanings of the following OSPF logs?
  • IF_CHG_E

The meanings are described as follows:

  • Feb 13 2009 17:10:52 LL-NE40E-1 %OSPF/3/NBR_CHG_DOWN(l): Neighbor event:neighbor state changed to Down. (ProcessId=1, NeighborAddress=, NeighborEvent=InactivityTimer, NeighborPreviousState=Full, NeighborCurrentState=Down)

    Log description: The neighbor relationship on the interface with the IP address changed from the Full state to the Down state. The status change reason is InactivityTimer, meaning that no Keepalive message is received from the neighbor in the DeadInterval configured on the OSPF interface.

    The other possible causes are listed below:
    • KillNbr: An interface or a BFD session went Down, or an OSPF process was reset.
    • LLDown: A VLANIF, trunk, or serial interface went Down.
    • SeqNumberMismatch: A fault occurred in route transmission between OSPF neighbors, or due to a transmission delay on links, the remote device received a Keepalive message from the local device after the OSPF neighbor relationship went Down and then sent a DD packet to the local device that is in the Full state.
  • May 10 2009 14:13:00 R13 %OSPF/6/NBR_CHANGE_E(l): Neighbor changes event: neighbor status changed. (ProcessId=1, NeighborAddress=, NeighborEvent=1-Way, NeighborPreviousState=Full, NeighborCurrentState=Init)

    Log description: The neighbor relationship on the interface with the IP address changed from the Full state to the Init state. The status change reason is 1-way, meaning that the local device received a Hello packet requesting for initializing the neighbor relationship.

    Reason for generating this log: The OSPF neighbor relationship on the remote device went Down, and the remote device sent an initialization packet to the local device. After having received the packet, the OSPF neighbor relationship on the local device also went Down.

  • May 12 2009 14:23:58 R13 %OSPF/6/IF_CHG_E(l): Interface received event InterfaceDown, interface state changed from DR to Down. (Process ID=1)

    Log description: The interface (where DR is configured) with the IP address went Down. The status change reason is that the interface received a neighbor interface Down event. Usually a physical interface went Down.

    The other possible causes are listed below:

    NeighborChange: After the DR on a broadcast network went Down, the BDR became a DR.

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Sergio93  Moderator   Created Sep 08, 2018 15:02:01 Helpful(1) Helpful(1)

Very helpful!!
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Mysterious.color  Novice   Created Sep 28, 2018 21:37:35 Helpful(1) Helpful(1)

that's verygoold to read
such articles are hard to find
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find what you love and let it kill you.
No.9527  Mentor   Created Sep 29, 2018 13:51:15 Helpful(1) Helpful(1)

I am very interested for this post, which is very helpful to our daily troubleshooting. I always have similar problems in my daily work, but I do not know how to deal with them. Now I have a clear idea. Thank you very much for your sharing. Hope you can update continue like this
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Skay  Adept   Created Sep 29, 2018 13:59:36 Helpful(1) Helpful(1)

I am very interested for this post, which is very helpful to our daily troubleshooting. When these print records appear in the log, is there a single possibility?
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SupperRobin  Novice   Created Sep 29, 2018 14:35:02 Helpful(1) Helpful(1)

Thanks for you share about this which is very useful for my daily troubleshooting.
And now i can easy to check the ospf logs if i face any issue about this.before this i aways do not know how to deal with them,and wasted a lot of time to serch this.Thanks agin for you selfless Sharing, Hope you can aways work like this. :):):):)
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GongXiaochuan  Adept   Created Sep 29, 2018 14:58:13 Helpful(1) Helpful(1)

This is exactly what I was looking for. I have been stuck for a long time on this problem. you gave me a very good idea ,I very much appreciate it.

Please keep on post and share more cases for all of us:)
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Good Good Study Day Day Up
yangyong  Adept   Created Sep 30, 2018 16:55:21 Helpful(0) Helpful(0)

I have encountered this question about you. I have checked a lot of information, but I still have not answered this question clearly. Thank you for sharing this knowledge and solving my doubts. I hope that you can continue to update such knowledge points. Thank you. !
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w1  Moderator   Created Oct 30, 2018 17:46:34 Helpful(0) Helpful(0)

Thanks for your sharing, normally, the OSPF is a very important protocol and very common, so the logs are also very important for checking the issue of OSPF, this post is very good for us to understand the logs, thanks again
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