[c-nsp] WIC-T1 total output drops?

[Graham Wooden]

Hi there,

On a recently T1 PtP deployment, I noticed that one end is getting a high
number of ³Total output drops².  51 in the last 24 minutes.
No other errors or abnormalities on this one side, and the other side is at
0.

What could cause this? My T1 debugging skills are still in novice mode.
Is this something that I need to be concerned with or am I overly paranoid?

Currently, not a ³whole lot of² traffic is going over this link; but I did
setup the QoS for that ³just incase².


Serial0/0 is up, line protocol is up
  Hardware is PQUICC with Fractional T1 CSU/DSU
  Internet address is nn.nn.nn.nn/30
  MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
     reliability 255/255, txload 3/255, rxload 1/255
  Encapsulation HDLC, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:06, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:24:03
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 51
  Queueing strategy: Class-based queueing
  Output queue: 0/1000/64/51 (size/max total/threshold/drops)
     Conversations  0/12/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 384 kilobits/sec
  30 second input rate 6000 bits/sec, 6 packets/sec
  30 second output rate 24000 bits/sec, 6 packets/sec
     27702 packets input, 3869862 bytes, 0 no buffer
     Received 168 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     37788 packets output, 33192561 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up
 
---
 Serial0/0 

  Service-policy output: VOIP

    Class-map: VOIP (match-any)
      15111 packets, 3175756 bytes
      30 second offered rate 3000 bps, drop rate 0 bps
      Match: access-group 11
        15111 packets, 3175756 bytes
        30 second rate 3000 bps
      Queueing
        Strict Priority
        Output Queue: Conversation 264
        Bandwidth 50 (%)
        Bandwidth 768 (kbps) Burst 19200 (Bytes)
        (pkts matched/bytes matched) 1832/387269
        (total drops/bytes drops) 0/0

    Class-map: class-default (match-any)
      39495 packets, 42393526 bytes
      30 second offered rate 188000 bps, drop rate 0 bps
      Match: any 
      Queueing
        Flow Based Fair Queueing
        Maximum Number of Hashed Queues 256
        (total queued/total drops/no-buffer drops) 40/51/0