3750 QoS Egress Queueing

Unanswered Question
Jul 29th, 2010

Hi,

I'm looking for the following solution. I want to put CoS 3 and 5 in the queue 2. When CoS 5 packets reach the 75% of the queue 2 they have to be dropped. But the frames with CoS 3 should continue to fill queue until it reach its maximim.

Thanks a lot in advance.

I have this problem too.
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z.zdravkov Thu, 07/29/2010 - 11:42

Hi Reza,

Your answer doesn't help me. I know well that I can assign packets according the DSCP or CoS to queues and threshold. I need solution how to do the WTD of this queue according the CoS value.

z.zdravkov Thu, 07/29/2010 - 12:31

The solution should look something like this:

mls qos srr-queue output cos-map queue 2 threshold 1 5
mls qos srr-queue output cos-map queue 2 threshold 2 3
mls qos queue-set output 1 threshold 2 75 100 100 100

and than applied on interface:

queue-set 1


I need somebody to prove this solution.

Reza Sharifi Thu, 07/29/2010 - 13:38

I did load this on a 3750-E but it does not seem to work.

may be I am missing someting

here is the config:

mls qos srr-queue output cos-map queue 2 threshold 1 5
mls qos srr-queue output cos-map queue 2 threshold 2 3
mls qos queue-set output 2 threshold 2 75 100 100 100
mls qos 

!
interface TenGigabitEthernet1/0/1
switchport trunk encapsulation dot1q
switchport trunk native vlan 899
switchport trunk allowed vlan 100,101
switchport mode trunk
queue-set 2
end

Here is the show command;

Switch-B(config-if)#do sh mls qos queue-set 2
Queueset: 2
Queue     :       1       2       3       4
----------------------------------------------
buffers   :      25      25      25      25
threshold1:     100      75     100     100
threshold2:     100     100     100     100
reserved  :      50     100      50      50
maximum   :     400     100     400     400
Switch-B(config-if)#

Switch-B(config-if)#do sh mls qos queue-set 1
Queueset: 1
Queue     :       1       2       3       4
----------------------------------------------
buffers   :      25      25      25      25
threshold1:     100      75     100     100
threshold2:     100     100     100     100
reserved  :      50     100      50      50
maximum   :     400     100     400     400
Switch-B(config-if)#

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