[c-nsp] counter bug? RxPause = multicasts

[Burton Windle]

I've got a 6500 with a Sup720 running 12.2(33)SXH1 with, among others, a 
WS-X6748-GE-TX blade. A port on the 6748 is seeing unusual port counters, 
where every RxPause frame is counted as a multicast packet (or vice versa, 
not sure which). Is this a bug in this code that someone else has seen, or 
some feature that I'm not familar with?

C_6506>show int gig3/26
GigabitEthernet3/26 is up, line protocol is up (connected)
   Hardware is C6k 1000Mb 802.3, address is 001e.be36.1d19 (bia 001e.be36.1d19)
   Description: SQ-001
   MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
      reliability 255/255, txload 13/255, rxload 11/255
   Encapsulation ARPA, loopback not set
   Keepalive set (10 sec)
   Full-duplex, 1000Mb/s, media type is 10/100/1000BaseT
   input flow-control is on, output flow-control is on
   Clock mode is auto
   ARP type: ARPA, ARP Timeout 04:00:00
   Last input never, output 00:00:28, output hang never
   Last clearing of "show interface" counters 6w6d
   Input queue: 0/2000/1/0 (size/max/drops/flushes); Total output drops: 0
   Queueing strategy: fifo
   Output queue: 0/40 (size/max)
   5 minute input rate 45814000 bits/sec, 6164 packets/sec
   5 minute output rate 51731000 bits/sec, 6212 packets/sec
      21690256068 packets input, 20171034172110 bytes, 0 no buffer
      Received 64229 broadcasts (10389 multicasts)
      0 runts, 0 giants, 0 throttles
      1 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored
      0 watchdog, 0 multicast, 10389 pause input
      0 input packets with dribble condition detected
      21616684473 packets output, 23513546564581 bytes, 0 underruns
      0 output errors, 0 collisions, 0 interface resets
      0 babbles, 0 late collision, 0 deferred
      0 lost carrier, 0 no carrier, 0 PAUSE output
      0 output buffer failures, 0 output buffers swapped out


The config for this port is drop-dead simple:

interface GigabitEthernet3/26
  description SQ-001
  switchport
  switchport access vlan 2
  switchport mode access
  flowcontrol receive desired
  spanning-tree portfast
end


-- 
Burton Windle                           bwindle at fint.org