On my network we have about 100 softphones (Solacom product) connected to a VLAN via 3750 stackable switches, then to a 6509 (distribution layer), then to a 7206 router (core layer) to go out to a WAN. Now, there is an Aspect VoIP gateway receiving the incoming calls using SIP.

My question is, how do I configure QoS on 3750/6509/7206?

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First you need to find out all the applications apart from voice and devise a QOS policy for the network. Voice any way will be the most prioritized one. Now you can configure this policy on the switches. You need to follow the steps given below.

Step 1: Create an access-list to classify the traffic either by MAC address or by port numbers used by the application.

Command to be used:

access-list (access-list-number) permit (protocol) (source) (source-wildcard) (port) (destination) (destination-wildcard) (port)

Step 2: Create a class-map.

Command to be used:

class-map class-map-name

Step 3: Define a match condition.

Command to be used:

Match access-group (the number given to access-list in step 2)

Step 4: Create a policy map to define the policy that should govern traffic identified by the class created above.

Command to be used:

policy-map (name)

Step 5: Attach the class.

Command to be used:

Class (class map name as given in step 2)

Step 6: Define the condition for this class.

Command to be used:

bandwidth 128

Step 7: Apply the policy map to the interface.

Command to be used:

service policy output (class-name)

Hope this helps you.

This was first published in January 2007

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