[c-nsp] "Total output drops" - congestion ? - 7200-VXR

[Rodney Dunn]

Hard to say without more data.

What is connected to the FE port shouldn't have anything to do with the ATM
link status.

On Thu, Jul 17, 2008 at 08:32:34AM +0800, Wilkinson, Alex wrote:
>     0n Wed, Jul 16, 2008 at 07:28:05AM -0400, Rodney Dunn wrote: 
> 
>     >What is the configuration of that interface and can you provide
>     >a 'sh int' between two drop periods?
> 
> >From 'running-config'
> 
>    interface FastEthernet4/10
>    no snmp trap link-status
> 
> >From 'show int FastEthernet4/10'
> 
>   FastEthernet4/10 is up, line protocol is up (connected)
>   Hardware is Fast Ethernet Port, address is 0009.e85e.9879 (bia 0009.e85e.9879)
>   MTU 1500 bytes, BW 10000 Kbit, DLY 100 usec, 
>      reliability 255/255, txload 1/255, rxload 1/255
>   Encapsulation ARPA, loopback not set
>   Keepalive set (10 sec)
>   Half-duplex, 10Mb/s
>   input flow-control is unsupported output flow-control is unsupported 
>   ARP type: ARPA, ARP Timeout 04:00:00
>   Last input never, output never, output hang never
>   Last clearing of "show interface" counters 18:17:11
>   Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 118
>   Queueing strategy: fifo
>   Output queue: 0/40 (size/max)
>   5 minute input rate 0 bits/sec, 0 packets/sec
>   5 minute output rate 1000 bits/sec, 2 packets/sec
>      7 packets input, 524 bytes, 0 no buffer
>      Received 0 broadcasts (0 multicast)
>      0 runts, 0 giants, 0 throttles
>      0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
>      0 input packets with dribble condition detected
>      136771 packets output, 13580522 bytes, 0 underruns
>      1 output errors, 0 collisions, 0 interface resets
>      0 babbles, 0 late collision, 0 deferred
>      0 lost carrier, 0 no carrier
>      0 output buffer failures, 0 output buffers swapped out
> 
> You will note that it is "Half-duplex, 10Mb/s". That is no mistake since the
> device that is connected to this switch-port is only capable of 10Mb/s.
> 
> I did a 'clear counters FastEthernet4/10' yesterday and came in this morning
> to find our ATM link was down again and "Total output drops" up to 118.
> 
> I then reboot the device that is connected to this switch-port and volia, ATM link
> comes up and EIGRP neighbour adjacency reforms.
> 
> Not sure how to verify if congestion is the root cause of this re-occuring
> problem.
> 
>  -aW
> 
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