Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

3750 QoS Egress Queueing

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.

4 REPLIES
VIP Super Bronze

Re: 3750 QoS Egress Queueing

Hi,

You can use srr-queue to assign certain threshold to certain DHCP value

have a look at this paper for more info:

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_tech_note09186a0080883f9e.shtml#concept31

HTH

Reza

New Member

Re: 3750 QoS Egress Queueing

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.

New Member

Re: 3750 QoS Egress Queueing

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.

VIP Super Bronze

Re: 3750 QoS Egress Queueing

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)#

315
Views
0
Helpful
4
Replies