3750 Outbound Queues

I'm trying to figure out how it is possible for any frames to be queued
into queue 2 threshold 2 when there is NOTHING in the dscp to output-q or
cos to output-q maps that put ANY frames into Q2T2. You can see in the
below output that nothing is mapped to those queues, yet 2636 packets have
been sent into Q2T2

I think I remember reading something a long time ago about "system" traffic
being sent into queue 2 but I can't find anything on it. Anyone know why
this might be happening?

sh mls qos maps dscp-output-q
   Dscp-outputq-threshold map:
     d1 :d2 0 1 2 3 4 5 6 7 8 9
     ------------------------------------------------------------
      0 : 04-03 04-03 04-03 04-03 04-03 04-03 04-03 04-03 04-01 04-02
      1 : 04-02 04-02 04-02 04-02 04-02 04-02 03-03 03-03 03-03 03-03
      2 : 03-03 03-03 03-03 03-03 02-03 02-03 02-03 02-03 02-03 02-03
      3 : 02-03 02-03 03-03 03-03 03-03 03-03 03-03 03-03 03-03 03-03
      4 : 01-03 01-03 01-03 01-03 01-03 01-03 01-03 01-03 02-03 02-03
      5 : 02-03 02-03 02-03 02-03 02-03 02-03 02-03 02-03 02-03 02-03
      6 : 02-03 02-03 02-03 02-03

sh mls qos maps cos-output-q
   Cos-outputq-threshold map:
              cos: 0 1 2 3 4 5 6 7
              ------------------------------------
  queue-threshold: 4-3 4-2 3-3 2-3 3-3 1-3 2-3 2-3

sh mls qos int t6/0/1 st | b enqueued
  output queues enqueued:
queue: threshold1 threshold2 threshold3
-----------------------------------------
 queue 0: 0 0 0
 queue 1: 0 2636 1347420
 queue 2: 0 0 210797
 queue 3: 0 0 43328378

-- 
Regards,
Joe Astorino
CCIE #24347
http://astorinonetworks.com
"He not busy being born is busy dying" - Dylan
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