mls qos cos override and the likes

Hi Guys,

I'm a bit confused with the combination of commands for mls qos on an
interface. The objective is to mark all incoming packets on that interface
with a cos marking of 3.

What's the difference between
interface fa0/1
mls qos trust cos
mls qos cos 3

and

interface fa0/1
mls qos cos 3
mls qos cos override

and if you have both override and trust cos, which one will take precedence?
Pls don't send me a Cisco link, the explanation from there is confusing.

Cheers!

Blogs and organic groups at http://www.ccie.net
Received on Fri Sep 09 2011 - 10:16:56 ART