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Error on ISL port after sfp and cable change

  • 1.  Error on ISL port after sfp and cable change

    Posted 01-29-2019 08:08 AM

    Hello,

     

    I've a lot of CRC errors on my ISL port between my two D300. We have changed sfp and cable but I still have error ! They appears after a major power issue in all city.

     

    I want to move sfp and cable to a new port and so change my ISL port, is it possible to perform that ?

     

    In case of, we have also done a fastboot on the switch.

     

    Don't have any other idea about this issue...


    Tks in advance.

     

    Romain


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  • 2.  Re: Error on ISL port after sfp and cable change

    Posted 01-31-2019 07:40 AM

    Hello,

     

    are you having only CRC errors or do you see another type of errors on the links?


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  • 3.  Re: Error on ISL port after sfp and cable change

    Posted 01-31-2019 10:43 AM

    First, the CRC errors need to be confirmed they are happening between the ISL ports and

    not originating from a device attached to either switch. 

     

    If the CRC error on the ISL port has incremented for counter "CRC" and "CRC g_eof"

    then the CRC happened between the ISL ports.

     

    If the CRC error on the ISL has incremented for counter "CRC" but "CRC g_eof" count is 0,

    then the CRC happened before the frame reached the ISL port.

     

    Use command porterrshow to observe CRC and CRC g_eof.

     

    So,  determine if the CRCs are occurring between ISLS or before the frame is forwareded

    to the ISLs.

     

    1) Clear the fc counters (cmd: statsclear) on each switch

    2) Clear the ASIC counters (cmd: slotstatsclear) on each switch

    3) Monitor for CRCs and CRC g_eof counters for ISL ports using command:  porterrshow

           If CRC increments but not CRC g_eof, the frame damage happened before the ISL port.

          Check the other ports on the switch that could be sending frames across the ISL.

     

          If CRC and CRC g_eof increment, I would check the output of  "sloterrshow" to see

          if there is any internal ASIC issue causing CRCs.

     

     4) Check the SFP tx and rx power levels too:     sfpshow x/y

         


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  • 4.  Re: Error on ISL port after sfp and cable change

    Posted 02-25-2019 05:57 PM
    That is highly useful information. Thanks for the post!
    #BrocadeFibreChannelNetworkingCommunity