Can someone please confirm, I'm configuring a Cisco 3750 running 12.2(25)SEE2 and I can not use the "mls qos trust cos" command on the port-channels, I can on the physical interfaces that make up the port-channel eg Gi 1/0/1, I've been looking round the Cisco web site and think that you only need to put the mls commands on the physical interface but would like a second opinion.
Whenever you use "mls qos trust device cisco-phone" command, you can think of it as enabling trust settings to take effect as long as the cisco phone is detected on that port. You still need to enter the command: "mls qos trust cos" if you want cos to be trusted. This command is used to form a trust boundary where a user cannot simply plug in their PC directly to the port and get priority queueing.
That's correct - you'll apply QoS (priority-queue, mls qos trust commands) on the physical port..
Then apply other things (like switchport mode trunk etc) on the port-channel... which then cascade down to the physical ports. All very confusing... it would be nicer to see some consistency with these configurations.
You do have it right as it is though.
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