The command "show platform qos queue stats gigabitEthernet X" yields the following output on a Catalyst 3850 switch:

AQM Broadcast Early WTD COUNTERS(In terms of Bytes)
  PORT TYPE          ENQUEUE             DROP
 UPLINK PORT-0        N/A               0
 UPLINK PORT-1        N/A               0
 UPLINK PORT-2        N/A               0
 UPLINK PORT-3        N/A               0
 NETWORK PORTS  678938231502        678938231502
 RCP PORTS               0                  0
 CPU PORT                0                  0

What exactly does "NETWORK PORTS" represent, and why is the traffic being dropped? The counters enumerate each time I issue the command.

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1 Answer 1


See this

WTD = Weighted Tail Drop

AQM = Advanced Queue Management (I think)

Network Ports = "downlink ports" i.e. non-uplink ports

Translation: The 3850 is marking some traffic headed out of one or more downlink ports for tail drop

  • Are these really broadcast drops or would this counter also include unicast traffic? Mar 3, 2018 at 11:36
  • @PaulGarrett Unfortunately the documentation does not clarify that, so you would have to find that out independently (using netflow, the output of show interfaces, the qos policies if any, etc.
    – mere3ortal
    Mar 4, 2018 at 3:18

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