how to configure qos in cisco 2960 switch

[ankur]

hi

i want to know that how to configure qos in cisco 2960 switch.

[dijohn]

Here's a doc which explains the same

http://www.cisco.com/en/US/docs/switches/lan/catalyst2960/software/release/12.2_25_see/configuration/guide/swqos.html#wp1231434

You could go the auto qos way too

/divin

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[Leo Laohoo]

i  want to know that how to configure qos in cisco 2960 switch.

I want to know which SPECIFIC MODEL do you have.  Some 2960 do not support QoS. 

[Mohammed Islam]

As pointed out above, some 2960 do not support qos.  However, the ones that do have the following characteristics:-

Queues

Global ingress queues = 2 with 2 configurable threshold values per queue and one system set.

Per port egress queues = 4 with 2 configurable threshold values per queue and one system set

Basic overview of setting up QoS using MQC (Modular QoS using CLI)

1. Traffic Classification using ACL

Specify what traffic you want to mark

2. Traffic match using class-map

Configure class-map match-any/all 'name'

match 'ACL'

3. Traffic marking using policy map

Configure policy-map 'name'

Specify the class-map 'name'

set ip dscp 'marking' dscp value

4. interface #/#

service-policy input 'policy-map name'

In regards to markings, I tend to use layer 3 DSCP markings as thats still preserved over hops.

I suggest you looking to qos mappings to understand more on how it works.  A couple of useful commands:-

show mls qos maps

show mls qos interface statistics (showing if packets are getting marked etc)

Hope that helps.

Regards

Mo