ATM and 3845

Discussion in 'Cisco' started by =?iso-8859-2?Q?Robert_Ko=B3aczy=F1ski?=, May 29, 2006.

  1. =?iso-8859-2?Q?Robert_Ko=B3aczy=F1ski?=

    =?iso-8859-2?Q?Robert_Ko=B3aczy=F1ski?= Guest

    Hello,

    I'm using 3845 router with ATM card. I have a few 10Mbps PVCs, and a few
    small speed PVCs - for example 512Kbps. I observed congested high speed PVC
    impacts low speed. Low speed PVCs have output drops and big delay with
    transmit packets.

    How to resolve this problem ?

    rawes
     
    =?iso-8859-2?Q?Robert_Ko=B3aczy=F1ski?=, May 29, 2006
    #1

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  2. =?iso-8859-2?Q?Robert_Ko=B3aczy=F1ski?=

    Jesper Skriver Guest

    The problem is likely that packets destined for the congested PVC uses
    all of the buffers on the tx_ring, so packets destined for the other
    PVC's either gets dropped due to no buffers available in the tx_ring, or
    have wait to get serviced until all the packets going to the congested
    PVC gets sent as the tx_ring is a FIFO buffer.

    I don't recall what the command is to configured a limit on a per
    vc basis, it might even be hidden. At my previous employer we used
    this on 7200/7500's with PA-A3 cards to solve this exact problem.

    If you open a TAC case they should be able to help you.
     
    Jesper Skriver, May 30, 2006
    #2

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