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

[Wilkinson, Alex]

    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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