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Loop detection on 5120-SI switches

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  • 1.  Loop detection on 5120-SI switches

    Posted May 29, 2013 07:56 AM

    Hi!

     

    Recently we had a loop in one of our VLANs in our HP based network (10500 core-switches, 5120-SI access switches). Someone connected an unmanaged switch to two access ports of the same 5120-SI switch. This caused the broadcast packets to loop and consume bandwidth...

     

    The configuration of the 5120-SI switches includes

     

     stp bpdu-protection

     stp enable

     

    and for the GigabitEthernet interfaces

     

     port access vlan X
     stp edged-port enable

     

    What do I need to configure to prevent such a user-caused loop to happen again? I though of using storm-constrain or stp loop-guard. Is there a best-practices guide for these features (for example, how many pps to use for storm-constrain) or is anyone here in the community already using this features and could post a working config?

     

    Thanks!

     

    Regards,

     

    Leonardo


    #5120siloopguardbroadcaststorm


  • 2.  RE: Loop detection on 5120-SI switches

    Posted May 31, 2013 03:15 AM

    loopback-detection multi-port would be your soltution

     

     

    loopback-detection enable

    loopback-detection multi-port-mode enable

     

    interf giga x/y/z

     loopback-detection enable

     

     

    br

    Manuel



  • 3.  RE: Loop detection on 5120-SI switches

    Posted Jun 25, 2013 09:10 AM

    Hi Manuel,

     

    thank you!

     

    Regards, Leonardo



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