I have some Catalyst 4948-10GE switches configured for QoS with COS to DSCP mapping commands. On each interface "qos cos 1" and "qos trust cos" are configured. A WireShark monitor of any port reveals that the packet DSCP value is "0x00". Have tried trust dscp with dscp default of 10 and configuring a Service Policy to tag "any" traffic with a DSCP value of "af", but the packets still have a DSCP value of "0x00".
Any solutions available?
have you configured mls qos in global config mode ?
2) cos settings apply to L2 trunk ports where an 802.1p CoS field is present in the 802.1Q header if the ports are access ports this setting is not effective for them.
3) are you using an monitor session or capturing traffic directed to the PC ?
Hope to help