QOS Configuration on 6248 Switches

Assuming you want to apply this across the entire switch; first of all you need to know the DSCP value being used by your VoIP traffic, lets say it's 26

console(config)#classofservice trust ip-dscp

console(config)#classofservice ip-dscp-mapping 26 5

The first command enables DSCP on the switch, so the switch will trust and DSCP value , then the second command tells the switch which hardware queue to map that DSCP value; there are 8 queues, but only 7 are available, 0-6; normally you map VoIP to one under the highest priority, so queue 5

Thank you for a quick response. Looking at the power connect 6248 manual I get the feeling the configuration should be something like this:

class-map match-all class_ef

  match ip dscp ef

  exit

policy-map pol_voip in

  class class_ef

  assign-queue 5

  exit

exit

interface range ethernet 1/g1-2

 service-policy in pol_voip

Is this not correct?

Am I making it unnecessarily complicated?

We will be using Cisco phones. The phones mark the Voice traffic with DSCP 46.  The call manager will be on the other side of the MPLS cloud.

You only need to set up a traffic policy if either your VoIP traffic is unmarked, or you want to change the DSCP value.

Whose VoIP solution are you using - most mark the traffic before it leaves the phone or softphone; if you have that then you don't need a traffic policy.