Re: ATM interface troubleshooting question. [7:2249]

[[EMAIL PROTECTED] (Katson Yeung)]

Thanks Dave,

I do think it is related to cell level.. but as an exercise, I would
really want to dig up the pieces the see the root cause...

At least there are three possibilities....

If there are lost cell, there should be a lost cell warning.... If it
is not a lost cell, but simply cell corruption, then there should be a
cell error... or maybe it is the telco ATM switch drop cell at the
middle? 

I don't know...





On 27 Apr 2001 16:40:47 -0400, [EMAIL PROTECTED] ("David Chandler")
wrote:

>Both but mainly a cell level issue:
>
>If you lose a cell, it will screw-up the AAL5 frame.  Thus causing the
>frame and/or CRC errors seen in sh int.   
>
>You are really moving some traffic.  Is this PVC traffic going across
>any links that may be congested?  A DS3 perhaps?  Need to find where the
>cells are getting dropped if you can.
>
>My $.02
>
>DaveC
>
>"[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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