Recently deployed 'auto qos trust dscp' on our LAN.
On one of our access point facing 9200s I am seeing a fair amount of drops on pretty much every interface connected to a Meraki AP. Drops I wasn't seeing before we implemented QOS. I know QOS is working because I can see the packets matching the queues and being prioritized on the edge (PAN firewall) but I am not clear on what is going on at the port level and whether I should be concerned or not.
We are tagging traffic in ZOOM and matching those tags in Meraki via traffic shaping rules so that we can tag end to end and it appears to be working as intended. But how do I find out what is being dropped and why?
show int gi1/0/1
GigabitEthernet1/0/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 9077.ee6f.4881 (bia 9077.ee6f.4881)
Description: Meraki AP-12
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/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 00:00:04, output 00:00:00, output hang never
Last clearing of "show interface" counters 1d03h
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 11475
Queueing strategy: Class-based queueing
Output queue: 0/40 (size/max)
5 minute input rate 1783000 bits/sec, 534 packets/sec
5 minute output rate 5836000 bits/sec, 988 packets/sec
12458330 packets input, 7531546540 bytes, 0 no buffer
Received 68153 broadcasts (62589 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 62589 multicast, 0 pause input
0 input packets with dribble condition detected
25437782 packets output, 18232537449 bytes, 0 underruns
Output 111605 broadcasts (0 multicasts)
0 output errors, 0 collisions, 0 interface resets
3326 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
9200#show policy-map int gi1/0/1
GigabitEthernet1/0/1
Service-policy input: AutoQos-4.0-Trust-Dscp-Input-Policy
Class-map: class-default (match-any)
179649055 packets
Match: any
QoS Set
dscp dscp table AutoQos-4.0-Trust-Dscp-Table
Service-policy output: AutoQos-4.0-Output-Policy
queue stats for all priority classes:
Queueing
priority level 1
(total drops) 11475
(pkts output) 1348718
Class-map: AutoQos-4.0-Output-Priority-Queue (match-any)
0 packets
Match: dscp cs4 (32) cs5 (40) ef (46)
Match: cos 5
Priority: 30% (300000 kbps), burst bytes 7500000,
Priority Level: 1
Class-map: AutoQos-4.0-Output-Control-Mgmt-Queue (match-any)
0 packets
Match: dscp cs2 (16) cs3 (24) cs6 (48) cs7 (56)
Match: cos 3
Queueing
queue-limit dscp 16 percent 80
queue-limit dscp 24 percent 90
queue-limit dscp 48 percent 100
queue-limit dscp 56 percent 100
(total drops) 0
(pkts output) 806829
bandwidth remaining 10%
queue-buffers ratio 10
Class-map: AutoQos-4.0-Output-Multimedia-Conf-Queue (match-any)
0 packets
Match: dscp af41 (34) af42 (36) af43 (38)
Match: cos 4
Queueing
(total drops) 0
(pkts output) 84
bandwidth remaining 10%
queue-buffers ratio 10
Class-map: AutoQos-4.0-Output-Trans-Data-Queue (match-any)
0 packets
Match: dscp af21 (18) af22 (20) af23 (22)
Match: cos 2
Queueing
(total drops) 0
(pkts output) 839
bandwidth remaining 10%
queue-buffers ratio 10
Class-map: AutoQos-4.0-Output-Bulk-Data-Queue (match-any)
0 packets
Match: dscp af11 (10) af12 (12) af13 (14)
Match: cos 1
Queueing
(total drops) 0
(pkts output) 215821
bandwidth remaining 4%
queue-buffers ratio 10
Class-map: AutoQos-4.0-Output-Scavenger-Queue (match-any)
0 packets
Match: dscp cs1 (8)
Queueing
(total drops) 0
(pkts output) 12475377
bandwidth remaining 1%
queue-buffers ratio 10
Class-map: AutoQos-4.0-Output-Multimedia-Strm-Queue (match-any)
0 packets
Match: dscp af31 (26) af32 (28) af33 (30)
Queueing
(total drops) 0
(pkts output) 9
bandwidth remaining 10%
queue-buffers ratio 10
Class-map: class-default (match-any)
0 packets
Match: any
Queueing
(total drops) 0
(pkts output) 10595787
bandwidth remaining 25%
9200#show plat hardware fed switch active qos queue stats interface gi1/0/1
----------------------------------------------------------------------------------------------
AQM Global counters
GlobalHardLimit: 3781 | GlobalHardBufCount: 0
GlobalSoftLimit: 9531 | GlobalSoftBufCount: 0
----------------------------------------------------------------------------------------------
Asic:0 Core:0 Port:4 Hardware Enqueue Counters
----------------------------------------------------------------------------------------------
Q Buffers Enqueue-TH0 Enqueue-TH1 Enqueue-TH2 Qpolicer
(Count) (Frames) (Frames) (Frames) (Frames)
-- ------- -------------------- -------------------- -------------------- --------------------
0 0 0 1091859 405618 0
1 0 2334 108712 743377 0
2 0 0 0 116 0
3 0 0 0 842 0
4 0 0 0 218652 0
5 0 0 0 13950087 0
6 0 0 0 9 0
7 0 0 0 11425586 0
Asic:0 Core:0 Port:4 Hardware Drop Counters
--------------------------------------------------------------------------------------------------------------------------------
Q Drop-TH0 Drop-TH1 Drop-TH2 SBufDrop QebDrop QpolicerDrop
(Frames) (Frames) (Frames) (Frames) (Frames) (Frames)
-- -------------------- -------------------- -------------------- -------------------- -------------------- --------------------
0 0 11488 0 0 0 0
1 0 0 0 0 0 0
2 0 0 0 0 0 0
3 0 0 0 0 0 0
4 0 0 0 0 0 0
5 0 0 0 0 0 0
6 0 0 0 0 0 0
7 0 0 0 0 0 0
