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Where is logging for interface negotiation history?

John Woodall

Hey all,

I googled it and I searched the forums here - but like all valuable tech nuggets I believe the answer is hidden in the nix/CLI which I'm pretty sure 99.999% of the world doesn't know how to leverage.

Being in the 99.999% - I'm hoping someone can tell me. 

A customer is stating that he has an interface flapping (WAN) due to negotiation issues - but I can't confirm or deny.

Please advise.



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  • FormerMember
    0 FormerMember in reply to John Woodall

    Hi John Woodall,

    Apologies for delayed response. The link speed of the interface is logged in syslog.log. I have tested in my LAB environment and collected output. 

    I disconnected and reconnected the interface Port2 cable to generate this logs. 

    # tail -f syslog.log

    Feb 10 15:27:29 (none) user.info kernel: [1654705.701319] igb_nm 0000:03:00.0 Port2: igb: Port2 NIC Link is Down
    Feb 10 15:27:32 (none) user.info kernel: [1654708.838073] igb_nm 0000:03:00.0 Port2: igb: Port2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None

    Thanks,

    Harsh Patel.

  • 0 in reply to FormerMember

    I see the example, but just watching the logs isn't sufficient for history.  The previous answer by another user allows me to see the history of the connection.

    Thank you for your input though!

  • 0 in reply to Keyur

    Thank you Keyur, this looks like exactly what I need.  I will test when I have an opportunity.  (We have long since made the change manually - so I don't have an interface flapping that I'm aware of currently)

  • FormerMember
    0 FormerMember in reply to John Woodall

    Hi John Woodall,

    Using "tail -f" was just an example to catch the log entries, if you are after the history of the speed negotiation, you have to use "cat" or "grep" to see static entries. 

    I am glad that your question was answered by the previous post. 

    Thanks,

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