I've got an issue with a new Catalyst 9300 deployment for a customer. We've moved routing from a dedicated router to the 9300 and the 9300 has taken the QoS for the site. We're using standard Auto QoS, trusting DSCP, but I'm seeing significant output drops on the WAN bound interface. Can anyone help shed some light on to what is going on? The stats don't seem to add up correctly on the port-map. The WAN providers interface is nailed to 100/Full and the Auto QoS is set to run in percentages of the interface and has dutifully set it's figures to a 100 Mbps reference bandwidth. I've upgraded the switches from 16.09.01 to 16.12.01, but that didn't clear the problem. I can't quite understand from the show policy-map what the drops in the priority-queue 1 are from, as it doesn't seem to be matching anything and there's no traffic on the site marked that should hit the priority-queue.
Here is a show interface:-
GigabitEthernet1/0/1 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is c4b3.6a05.7c81 (bia c4b3.6a05.7c81) Description: Network::WAN MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec, reliability 255/255, txload 2/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Carrier delay is 0 msec Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX input flow-control is on, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:01, output 00:00:08, output hang never Last clearing of "show interface" counters never Input queue: 0/200000/0/0 (size/max/drops/flushes); Total output drops: 35615 Queueing strategy: Class-based queueing Output queue: 0/200000 (size/max) 30 second input rate 34000 bits/sec, 34 packets/sec 30 second output rate 966000 bits/sec, 102 packets/sec 120258 packets input, 66898060 bytes, 0 no buffer Received 2703 broadcasts (2702 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 2702 multicast, 0 pause input 0 input packets with dribble condition detected 285906 packets output, 310294634 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 unknown protocol drops 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
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