[c-nsp] POS Output Queue Drops

[Rodney Dunn]

Put a policer on the outbound POS that transmits for confrom and exceed
and see if you are bursting up to the OC3 rate.

On Fri, Dec 15, 2006 at 02:07:48PM -0800, Richard Hicks wrote:
> 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
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