The CRCs indicate that a cell or multiple cells required to reconstruct the
common part
convergence sublayer pdu (cpcs pdu) were "lost". Thus the IP datagram(s)
can not be
successfully reassembled. The frame errors however indicate a SONET problem
possibly at
the physical layer. Judging from the fact that in your snapshot there is
actually
something sitting in the input queue and there are drops, there are possibly
multiple
problems. 1) traffic is very bursty and at times fills the input queue and
causes a drop
here and there. Remember that the traffic in the input queue has however,
already
successfully been reassembled and is waiting to be switched to the
appropriate output
interface. 2) there is a physical problem check the other side also. Check
the
controller output on the 7507 (show controllers cbus if I remember
correctly). Also,
what is on the other side? Check that too. HTH.
--trey
"[EMAIL PROTECTED] (Katson Yeung)" wrote:
> Dear all,
>
> My old 7507 is having a minor problem.... it is 12.0.16GD, RSP2 with
> 64M ram and the ATM card is an AIP. I have only one VC associate with
> this ATM port.
>
> I found quite a number of input errors (CRC and Frames)... how can I
> know the source of that problem?? Is it the cell level, or the frame
> level problem?
>
> See below show interface output:
>
> ATM0/0 is up, line protocol is up
> Hardware is cxBus ATM
> MTU 4470 bytes, sub MTU 4470, BW 155520 Kbit, DLY 80 usec, rely
> 255/255, load 8/255
> Encapsulation ATM, loopback not set, keepalive not supported
> Encapsulation(s): AAL5, PVC mode
> 256 TX buffers, 256 RX buffers,
> 2048 maximum active VCs, 1024 VCs per VP, 1 current VCCs
> VC idle disconnect time: 300 seconds
> Last input 00:00:00, output 00:00:00, output hang never
> Last clearing of "show interface" counters 3d10h
> Queueing strategy: fifo
> Output queue 0/40, 0 drops; input queue 1/75, 40 drops
> 5 minute input rate 34782000 bits/sec, 4564 packets/sec
> 5 minute output rate 5307000 bits/sec, 3372 packets/sec
> 1174284787 packets input, 1013959162 bytes, 0 no buffer
> Received 0 broadcasts, 0 runts, 0 giants, 11 throttles
> 13076769 input errors, 13054514 CRC, 22255 frame, 0 overrun, 0
> ignored, 0 abort
> 893230791 packets output, 346650156 bytes, 0 underruns
> 0 output errors, 0 collisions, 0 interface resets
> 0 output buffer failures, 0 output buffers swapped out
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