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Ask the Expert- SD-WAN

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Beginner

Find which queue is dropping traffic cisco WS-C4928-10GE

We have a WS-C4928-10GE and it has output drops. I suspect a configuration issue and I believe it's related to how they have it setup. 

However, I used to be able to run "show platform port-asic stats drop gx/x/x" on Cisco 3750 to see which queue was dropping.

The 4928 doesn't seem to support that command structure. 

I also tried other commands such as show qos, show policy map interface, etc.

How do we find which queue is dropping packets and which ones are not receiving traffic?

 

Thanks

 

 

We are running cat4500-entservices-mz.150-2.SG2.bin.

They don't have any policy configured on the interface but they have this configured:

 

interface GigabitEthernet1/2
 description pa01
 no switchport
 no ip address
 logging event link-status
 logging event trunk-status
 qos trust dscp
 snmp ifindex persist
 tx-queue 1
   bandwidth percent 30
 tx-queue 2
   bandwidth percent 30
 tx-queue 3
   bandwidth percent 30
   priority high
 tx-queue 4
   bandwidth percent 10
 channel-group 1 mode desirable
 spanning-tree bpduguard disable

 

We also have this configured:

qos map dscp 26 34 48 56 to tx-queue 1
qos map dscp 0 10 to tx-queue 4
qos map cos 1 to dscp 10 
qos map cos 2 to dscp 18 
qos map cos 3 to dscp 26 
qos map cos 4 to dscp 34 
qos map cos 5 to dscp 46 

 

GigabitEthernet1/2 is up, line protocol is up (connected) 
  Hardware is Gigabit Ethernet Port, address is f0f7.5510.a44f (bia f0f7.5510.a44f)
  Description: pa01
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 2/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, link type is auto, media type is No Gbic
  input flow-control is on, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:22, output never, output hang never
  Last clearing of "show interface" counters 1w1d
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 83906

 

 

1 ACCEPTED SOLUTION

Accepted Solutions
Engager

Doesn't it show as this then?

Doesn't it show as this then?


c4948-1#show interfaces counters detail | be Drop
Port       Tx-Drops-Queue-1  Tx-Drops-Queue-2 Tx-Drops-Queue-3  Tx-Drops-Queue-4
Gi1/1                     0                 0                0                 0
Gi1/2                     0                 0                0                 0
Gi1/3                     0                 0                0                 0
Gi1/4                     0                 0                0                 0
Gi1/5                     0                 0                0                 0
[snip]
Port       Dbl-Drops-Queue-1 Dbl-Drops-Queue-2 Dbl-Drops-Queue-3 Dbl-Drops-Queue-4
Gi1/1                      0                 0                 0                 0
Gi1/2                      0                 0                 0                 0
Gi1/3                      0                 0                 0                 0
Gi1/4                      0                 0                 0                 0
Gi1/5                      0                 0                 0                 0

Regards

 

 

8 REPLIES 8
Beginner

Hi,

Hi,

did you try the following already?

sh mls qos int <interface> statistics

Regards,
Markus

Beginner

I haven't tried this I

I haven't tried this I believe but I'll try it and let you know. thanks

Beginner

It doesn't support it.

It doesn't support it.

Engager

On the Catalyst 4948 (which I

On the Catalyst 4948 (which I believe is the same architecture as the 4928) it's as simple as show interface gi 1/2 counters detail.

If you want to look at the drops across any or several interfaces it's probably easier to use show interface counters detail and scroll through to the section with the queue drops.

Regards

Beginner

This just shows the different

This just shows the different counters but does not show which queue is dropping the packets but thanks. 

Engager

Doesn't it show as this then?

Doesn't it show as this then?


c4948-1#show interfaces counters detail | be Drop
Port       Tx-Drops-Queue-1  Tx-Drops-Queue-2 Tx-Drops-Queue-3  Tx-Drops-Queue-4
Gi1/1                     0                 0                0                 0
Gi1/2                     0                 0                0                 0
Gi1/3                     0                 0                0                 0
Gi1/4                     0                 0                0                 0
Gi1/5                     0                 0                0                 0
[snip]
Port       Dbl-Drops-Queue-1 Dbl-Drops-Queue-2 Dbl-Drops-Queue-3 Dbl-Drops-Queue-4
Gi1/1                      0                 0                 0                 0
Gi1/2                      0                 0                 0                 0
Gi1/3                      0                 0                 0                 0
Gi1/4                      0                 0                 0                 0
Gi1/5                      0                 0                 0                 0

Regards

 

 

Beginner

Let me double check and get

Let me double check and get back to you. Thanks

Highlighted
Beginner

I actually ran this before

I actually ran this before but overlooked it. Thank you very much and very appreciated! 

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