Re: QoS question

Adrian,
ip traffic is always marked with some code, that should give you a clue.
But if it does not, then it depends on the logic of the policy, but
you can remark if you will. In your terms, the policy has precedence.

"mls qos trust device" only disables the wiping of the incoming mark.

It's a litle more complicated than that in fact. You need to have
"mls qos trust dscp" in place, and that initializes the internal QoS
marking to that of the incoming IP dscp. Then if "trust device" is
added, the initialization is replaced with 0 if the connected device
is not a cisco phone. Then comes your policy to change whatever, and
last and option to leave the initial marking alone when sending.
To top it, this is architecture dependent.

HTH,
-Carlos

Lazar Adrian @ 8/04/2010 6:29 -0300 dixit:
> Hi guys,
>
> I have a simple QoS implementation with one policy-map marking the traffic
> inbound coming from a user or IP phone (I have a general port config, so
> same port config no matter if a PC or phone connects to it).
> Now, my question is related to the precedence of "mls qos trust device
> cisco-phone" and "service-policy QoS_Marking inbound" commands. What I want
> to know and I haven't found this information anywhere is, if my phone sends
> DSCP EF marked traffic will the policy-map mark it down ? So the matter
> resumes to what command has precedence over the other.
>
> Thank you,
>
> Adrian
>
> PS: Disregard the previous mail, I accidentally hit the send button too
> early :)
>
>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net