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4506 QoS DSCP priorities

Does a Catalyst 4506 prioritize packets according to DSCP value automatically after enabling QoS globally?

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Re: 4506 QoS DSCP priorities

It depends on whether you have classification policies applied and trust status on receiving port.

Here are the different scenarios:

1-Port set to trust DSCP => use DSCP from Packet.

2-Port set to trust COS => use cos to dscp map to obtain DSCP value.

3-no trust configured => use default port DSCP.

4-Traffic matches a class map => use DSCP set by policy.

Internal DSCP derived from the above are then used to place packets into the different outbound Queues.

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/31sga/configuration/guide/qos.html

HTH

Sam

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