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

Rodney Dunn rodunn at cisco.com
Thu Jul 17 10:37:44 EDT 2008


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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> 
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