[c-nsp] POS Output Queue Drops

[Richard Hicks]

I have 2 new POS OC3 circuits to different ISP's.  I am running little
traffic over these links currently (Average 10mbit out, peaking to
20mbit).  But I am seeing output queue drops on both circuits.

Both are 7206VXR's with NPE-G2 running 12.4(4)XD2.

According to Cisco documentation I should only get output drops if the
circuit is full or can't handle a traffic burst.  I don't think either
of these applies to me.

Any ideas on why I am seeing these output queue drops?

Router1#show int pos 1/0
POS1/0 is up, line protocol is up
  Hardware is Packet over Sonet
  Description: OC3 POS
  Internet address is xxx.xxx.xxx.xxx/30
  MTU 4470 bytes, BW 155000 Kbit, DLY 100 usec,
     reliability 255/255, txload 6/255, rxload 2/255
  Encapsulation PPP, LCP Open
  Open: IPCP, CDPCP, crc 16, loopback not set
  Keepalive set (10 sec)
  Scramble disabled
  Last input 00:00:02, output 00:00:00, output hang never
  Last clearing of "show interface" counters 1w4d
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 11785
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 1404000 bits/sec, 525 packets/sec
  5 minute output rate 3652000 bits/sec, 870 packets/sec
     364062953 packets input, 2013742986 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
              0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     742407543 packets output, 2729543042 bytes, 0 underruns
     0 output errors, 0 applique, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions