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how to find where the topology changes are happening?

  • 1.  how to find where the topology changes are happening?

    Posted 08-24-2017 19:00
    I have about 130 switches in 8 rings topology, all connected to one core switch.
    looking to the "Number of Topology Changes" I am finding high numbers, but I cannot figure out where this changes is being happened.

    the used switches: X440, BD8806
    Network cabling: 10G FO.

    any way to figure out?


  • 2.  RE: how to find where the topology changes are happening?

    Posted 08-24-2017 19:10
    When you go to the core, type in

    show stpd "s0" ports counters.

    What output do you see?



  • 3.  RE: how to find where the topology changes are happening?

    Posted 08-24-2017 19:16
    Hi Yusuf,

    There's a log message that can be added to the switch for that.

    Here is the article on the subject:
    https://gtacknowledge.extremenetworks.com/articles/Q_A/Is-there-an-EMS-log-filter-that-can-be-used-t...

    Thanks!
    Brad



  • 4.  RE: how to find where the topology changes are happening?

    Posted 08-25-2017 06:09
    Hi Yusuf,

    Adding on to output of "show stpd ". Check the information in the field "Topology Change initiated locally on Port". This gives an idea as to where to start looking for in the switch.

    Also, the logs can give you an idea if there had been any port flap seen in STP configured port that might have also caused the TCN to be generated by the switch.

    Just a word of information, if the STP is configured for auto-bind ports, please configure STP edge on the host connecting ports to aviod the unnecessary generation of TCN.

    Thank You,


  • 5.  RE: how to find where the topology changes are happening?

    Posted 08-24-2017 19:10
    No such an argument!




  • 6.  RE: how to find where the topology changes are happening?

    Posted 08-24-2017 19:16
    Thanks Brad,

    should I use it on all switches or deploying on core is enough?

    Thanks
    Yusuf


  • 7.  RE: how to find where the topology changes are happening?

    Posted 08-24-2017 19:16
    As long as the core is participating in all of the STP domains, I would put it there. That will likely give you the notification you need.