error on ATM interface

Unanswered Question
Aug 17th, 2010
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Dears ,


I'm seeing too many input errors and aborts  on my ATM interface .


  488308 input errors, 0 CRC, 0 frame, 2098 overrun, 0 ignored, 488417 abort


What could be the problem ? I heard that this can be because of NPE limitation ? Is there is any work around ?

I'm using  PA-A1-OC3SM with 7206vxR (NPE 300)


Regards

haris

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Giuseppe Larosa Tue, 08/17/2010 - 13:13
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Hello Haris,

generally speaking only overrun errors are sign of a performance problems but most of your errors are abort


so I would look for clocking problems rather then performance issues


However, at the following link describing A1 port adapters


and more specifically


http://www.cisco.com/en/US/products/hw/modules/ps2033/products_tech_note09186a00800d77bb.shtml


abort—Counts the number of times that a  cell was dropped due to a receive cell FIFO overrun. More specifically,  aborts are packet drops caused by cell throttling, at the microcode  level, to alleviate framing overruns. Thus, aborts stem from overruns,  and you might see both counters increment on the ATM interface. Aborts  point to congestion on the PCI bus.


before NPE-300 issues the document clearly states this PA has low performances


  • Try replacing the PA-A1 with a PA-A3 (revision 2).

    The PA-A1 has a very shallow receive cell FIFO and is not the best choice for heavy receive traffic or long bursts.


    Hope to help

    Giuseppe


    Haris P Tue, 08/17/2010 - 13:33
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    Dear Giuseppe,


    Is there is any work around ?


    I dont have a PA-A3 ready and it might take some time


    regards,

    Haris P

    Giuseppe Larosa Wed, 08/18/2010 - 03:55
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    Hello Haris,


    >> Is there is any work around ?


    I'm afraid you could only add a second interface to reduce load on this one


    being an hardware problem there is no configuration workaround




    Hope to help

    Giuseppe

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