3850 funny QoS counters

[wintermute000]

Am I missing something here or does below QOS counter output (C3850) not make any sense?


Output counters differ between parent and child (But there's only 1 child and 1 parent...)

   
• Bytes are allegedly output in priority queue but the priority class matches 0
• No packets match any classes but packets are being output not dropped (confirmed via show interface as well)

Only sane conclusion is that counters are not to be trusted


Note: this is a lab switch - reproducing a field issue (basically reproduced it, in a roundabout way... the 'real' unit has 0s across the board as to counters but there are no drops either)


me-ld8r07-esw04#sh policy-map int g1/0/3
GigabitEthernet1/0/3

  Service-policy output: PM-TESTQOS-50M-PARENT

    Class-map: class-default (match-any)
      0 packets
      Match: any
      Queueing

      (total drops) 0
      (bytes output) 366228586
      shape (average) cir 990000000, bc 3960000, be 3960000
      target shape rate 990000000

      Service-policy : PM-TESTQOS-50M-CHILD

        queue stats for all priority classes:
          Queueing

          (total drops) 0
          (bytes output) 112407452

        Class-map: CM-TESTQOS-VOICE (match-any)
          0 packets
          Match:  dscp ef (46)
            0 packets, 0 bytes
            30 second rate 0 bps
          Priority: 20000 kbps, burst bytes 500000,


        Class-map: class-default (match-any)
          0 packets
          Match: any


          (total drops) 0
          (bytes output) 253821134

Config is bare-bones testing

class-map match-any CM-TESTQOS-VOICE
  match  dscp ef

policy-map PM-TESTQOS-50M-CHILD
class CM-TESTQOS-VOICE
    priority 20000
class class-default

policy-map PM-TESTQOS-50M-PARENT
class class-default
    shape average 990000000
   service-policy PM-TESTQOS-50M-CHILD

[Dieselboy]

QoS is done in hardware on the switches so counters arent ever right in my experience. The "show policy-map interface" command doesnt work for me, either on my switches.  And it threw me for a bit in the past also.

[dlots]

That is weird :-(