Re: mls qos cos override and the likes

Hi Emir,

In the first instance when you trust cos, you are trusting the 802.1P tags
on Frames. A the same time for untagged frames (which dont have 802.1P
tags), the mls qos cos 3 means they wont have the default value of 0 and
will be now set to 3

In the second instance, you are making every ethernet frame have a cos value
of 3.

Cheers,
Adam

On Fri, Sep 9, 2011 at 8:16 AM, emir d souza <emir979_at_gmail.com> wrote:

> 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!
>
>
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Received on Fri Sep 09 2011 - 10:55:18 ART