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New Member

CatOS to Native IOS Config Conversion Question

Sorry for this OT post. I'm working to convert a CatOS configuration on a 4000 to IOS for a newer series switch (3700). My question is about a few QoS commands that I'm finding on the CatOS which I can't find enough documentation about to convert to IOS. The commands are as follows:


set qos enable

set qos map 2q1t 2 1 cos 2-3

set qos map 2q1t 2 1 cos 4-5

set qos map 2q1t 2 1 cos 6-7

I see that we are setting transmit and queuing thresholds for the various CoS. I can't find an equivalent command in IOS that will do this or for that matter is the queuing structure even the same. Can anyone help me to solve this puzzle?


Cisco Employee

Re: CatOS to Native IOS Config Conversion Question

You can use " MLS qos " global config command to enable the QOS globally on the switch. You can use the " wrr-queue threshold command to map the queue with the COS vlaues. Please see the link below for more info:


-amit singh

New Member

Re: CatOS to Native IOS Config Conversion Question

Thanks, Amit. Very good information. Since this other queue is being used for video conferencing, I need to be 100% sure that I get it configured the same as before.

I see on the 4000 series switch the commands are enabled for the entire switch. It looks like the wrr-queue commands can only be enabled on gigabit interfaces. The only gigabit interfaces I have are uplinks to the core.

Reading the link you posted, it looks like I need to configure something like:

# mls qos

# interface range g1/0/1, g2/0/1 !only 2 gigabit interfaces are used on the switch

# wrr-queue cos-map 2 2 7 !maps cos 2-7 to queue 2

# wrr-queue threshold 2 70 100 ! I have no idea from the last config what these parameters should be set to. These are watermark % for tail drop. Is this what I want?