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9200L switch drops

Moudar
VIP
VIP

‎11-13-2023 12:22 AM

Hi,

I got some 9200L switches with some drops, some people are complaining about Teams meatings are bad, when i checked the switch i could find these drops. Maybe these drops do not have a big effect on the overall switching process, but I wonder why do these happen.

I checked this guide:

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-9300-switch/216236-troubleshoot-output-drops-on-catalyst-90.html

I tried to do as the guide says but still have drops:

sh interfaces | in Total output drops:
  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 758
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 644
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 1224
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 1944
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 295
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 868
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 144
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 5030
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 1670
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 385
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 950
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 2383
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 392
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 2353
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 1570
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 798
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 1304
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 89
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0

My configuration looks like this:

policy-map QOS_Q_OUT
 class VOICE
  priority level 1 percent 10
  queue-buffers ratio 5
 class class-default
  bandwidth remaining percent 100
  queue-buffers ratio 55

!
interface GigabitEthernet1/0/3
 switchport access vlan 419
 switchport mode access
 ip flow monitor FLOW-MON input
 spanning-tree portfast
 service-policy output QOS_Q_OUT
!
All interfaces have the same confiuration!!

Any ideas on how to improve my configuration to have less drops.

It is weird to have thses drops but not showing these when trying this command:

show platform hardware fed switch active qos queue stats interface gi 1/0/4

show platform hardware fed switch active qos queue stats interface gigabitEthernet 1/0/4
----------------------------------------------------------------------------------------------
AQM Global counters
GlobalHardLimit: 2875   |   GlobalHardBufCount: 0
GlobalSoftLimit: 10437   |   GlobalSoftBufCount: 0

----------------------------------------------------------------------------------------------
High Watermark Soft Buffers:  Port Monitor Disabled
----------------------------------------------------------------------------------------------
Asic:0 Core:0 DATA Port:7 Hardware Enqueue Counters
-------------------------------------------------------------------------
 Q Buffers          Enqueue-TH0          Enqueue-TH1          Enqueue-TH2
   (Count)              (Bytes)              (Bytes)              (Bytes)
-- ------- -------------------- -------------------- --------------------
 0       0                    0                    0               203139
 1       0                    0                    0            278708956
 2       0                    0                    0                    0
 3       0                    0                    0                    0
 4       0                    0                    0                    0
 5       0                    0                    0                    0
 6       0                    0                    0                    0
 7       0                    0                    0                    0
Asic:0 Core:0 DATA Port:7 Hardware Drop Counters
-----------------------------------------------------------------------------------------------------------
 Q             Drop-TH0             Drop-TH1             Drop-TH2             SBufDrop              QebDrop
                (Bytes)              (Bytes)              (Bytes)              (Bytes)              (Bytes)
-- -------------------- -------------------- -------------------- -------------------- --------------------
 0                    0                    0                    0                    0                    0
 1                    0                    0                    0                    0                    0
 2                    0                    0                    0                    0                    0
 3                    0                    0                    0                    0                    0
 4                    0                    0                    0                    0                    0
 5                    0                    0                    0                    0                    0
 6                    0                    0                    0                    0                    0
 7                    0                    0                    0                    0                    0
sh inter gigabitEthernet 1/0/4
GigabitEthernet1/0/4 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 8c84.4248.6804 (bia 8c84.4248.6804)
  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 00:05:32, output 00:00:01, output hang never
  Last clearing of "show interface" counters 8w6d
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 1224
  Queueing strategy: Class-based queueing
  Output queue: 0/40 (size/max)
  5 minute input rate 8000 bits/sec, 1 packets/sec
  5 minute output rate 17000 bits/sec, 7 packets/sec
     62003445 packets input, 56167278049 bytes, 0 no buffer
     Received 72901 broadcasts (64715 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 64715 multicast, 0 pause input
     0 input packets with dribble condition detected
     83141837 packets output, 67288428361 bytes, 0 underruns
     Output 579517 broadcasts (2391039 multicasts)
     0 output errors, 0 collisions, 0 interface resets
     1136 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

Do my configuration do some job?! Why ?

Any ideas

 

Labels:
0 Helpful
21 Replies 21

MHM Cisco World
VIP
VIP

‎11-13-2023 12:26 AM

qos queue-softmax-multiplier 1200
 
add this command and check drop count 

Thanks A Lot
MHM
0 Helpful

Moudar
VIP
VIP
In response to MHM Cisco World

‎11-13-2023 12:41 AM

That command is already there:

!
login on-success log
qos queue-softmax-multiplier 1200
!
0 Helpful

MHM Cisco World
VIP
VIP
In response to Moudar

‎11-13-2023 12:51 AM 

sw#show platform qos queue config gigabitEthernet x/x/x

 share output of this for one of port face output drop 

Thanks A Lot
MHM

0 Helpful

Moudar
VIP
VIP
In response to MHM Cisco World

‎11-13-2023 01:07 AM

My switch does not support "show platform qos"!

show platform ?
  arpsnooping          ARP snooping
  atm-cdvt             Display platform atm cdvt value
  authentication       Show switch auth info
  conditions           Show conditional debug info
  dhcpsnooping         DHCP snooping
  dhcpv6snooping       DHCP v6 snooping
  diag                 Diagnostic information
  fabric               SDA fabric related information
  flow                 Show Platform flow for FNF Information
  frontend-controller  Show frontend controller info
  hardware             Show platform hardware information
  host-access-table    host access table info
  idbman               Interface Descriptor Block management information
  integrity            Boot integrity
  l2lisp               platform l2lisp
  matm                 show platform matm info
  mcu                  show platform mcu information
  oir                  NGWC OIR
  packet-trace         CPP packet trace information
  pm                   Show Platform Port Manager Info
  resources            Show platform resources information
  software             Show platform software information
  sudi                 Secure identity
  usb                  Show Platform USB Information
  wdavc                Show Platform wdavc config info
  |                    Output modifiers
  <cr>                 <cr>
0 Helpful

MHM Cisco World
VIP
VIP
In response to Moudar

‎11-13-2023 01:09 AM 

9300#show platform hardware fed switch active qos queue config interface gigabitEthernet x/x/x
0 Helpful

Moudar
VIP
VIP
In response to MHM Cisco World

‎11-13-2023 01:17 AM 

show platform hardware fed switch active qos queue config interface gigabitEthernet 1/0/4
Asic:0 Core:0 DATA Port:7 GPN:4 LinkSpeed:0x1
AFD:Disabled FlatAFD:Disabled QoSMap:0 HW Queues: 56 - 63
  DrainFast:Disabled PortSoftStart:3 - 7500
   DTS  Hardmax  Softmax   PortSMin  GlblSMin  PortStEnd   QEnable
  ----- --------  --------  --------  --------  ---------  -------
 0   1  7    51   7    51   0     0   0     0   4 10000      En
 1   1  5     0   8  7344   3   688   1   229   4 10000      En
 2   1  5     0   6     0   0     0   0     0   4 10000      En
 3   1  5     0   6     0   0     0   0     0   4 10000      En
 4   1  5     0   6     0   0     0   0     0   4 10000      En
 5   1  5     0   6     0   0     0   0     0   4 10000      En
 6   1  5     0   6     0   0     0   0     0   4 10000      En
 7   1  5     0   6     0   0     0   0     0   4 10000      En
 Priority   Shaped/shared   weight  shaping_step  sharpedWeight
 --------   -------------   ------  ------------   -------------
 0      1     Shaped          2550         255           0
 1      7     Shared            50           0           0
 2      0     Shared         10000           0           0
 3      0     Shared         10000           0           0
 4      0     Shared         10000           0           0
 5      0     Shared         10000           0           0
 6      0     Shared         10000           0           0
 7      0     Shared         10000           0           0
 Port       Port            Port    Port
 Priority   Shaped/shared   weight  shaping_step
 --------   -------------   ------  ------------
        2     Shaped           254         255

   Weight0 Max_Th0 Min_Th0 Weigth1 Max_Th1 Min_Th1  Weight2 Max_Th2 Min_Th2
   ------- ------- ------- ------- ------- -------  ------- ------- ------
 0       0      81       0       0      90       0       0     102       0
 1       0    5852       0       0    6540       0       0    7344       0
 2       0       0       0       0       0       0       0       0       0
 3       0       0       0       0       0       0       0       0       0
 4       0       0       0       0       0       0       0       0       0
 5       0       0       0       0       0       0       0       0       0
 6       0       0       0       0       0       0       0       0       0
 7       0       0       0       0       0       0       0       0       0

MHM Cisco World
VIP
VIP
In response to Moudar

‎11-13-2023 01:28 AM

that not good at all, 
I will check the Queue you use and send you the correct one 
or you can use Cisco  value 

policy-map MYPOL
 class Voice
  priority level 1 percent 20
 class Video
  priority level 2 percent 10
 class Control
  bandwidth percent 10
 class Data
  bandwidth percent 5
 class class-default 

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-9300-switch/216236-troubleshoot-output-drops-on-catalyst-90.html#toc-hId--833685518

Thanks A Lot
MHM

0 Helpful

Moudar
VIP
VIP
In response to MHM Cisco World

‎11-13-2023 01:33 AM

Please send what you are using so I can have different ways to go

0 Helpful

Leo Laohoo
Hall of Fame
Hall of Fame
In response to Moudar

‎11-13-2023 01:34 AM

Take off the QoS settings and see if it improve things.

0 Helpful

Moudar
VIP
VIP
In response to Leo Laohoo

‎11-13-2023 01:36 AM

I started to use QoS because I had drops. I mean taking them out will not improve my case. This is happening in many 9200L switches!

Leo Laohoo
Hall of Fame
Hall of Fame
In response to Moudar

‎11-13-2023 02:23 AM

What are the downstream clients, are they servers?

0 Helpful

Moudar
VIP
VIP
In response to Leo Laohoo

‎11-13-2023 02:48 AM

no, only normal windows clients which do much Teams meatings!

0 Helpful

MHM Cisco World
VIP
VIP
In response to Moudar

‎11-13-2023 02:00 AM

friend Qos divide into two part 
you already apply this which is 100% correct
qos queue-softmax-multiplier 1200

you then apply QoS Policy to interface, it not correct you can remove it and check drop or use the above (what I share) to port

Thanks A Lot
MHM

 
0 Helpful

Joseph W. Doherty
Hall of Fame
Hall of Fame

‎11-13-2023 05:23 AM

The OP doesn't provide sufficient information to analyze your Teams issue.  Actual drops are likely not directly adverse to your Team's traffic but possibly deep queuing might be.  What queue is your Team's traffic directed to?

0 Helpful
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