From: Pavel Bykov (slidersv@gmail.com)
Date: Thu Jan 08 2009 - 20:26:29 ARST
Rookie, to answer your question:
Yes, you can do it. From testing, service policy takes precedence over port
settings. E.G. you can have "trust cos" on the port and "trust dscp" only
for some packets that match a class
P.S.: Beware of the cofusion that arises from port trust state.
Only CoS is reset to 0. But no CoS is coming from PC, since there is no
802.1p field. Only voice VLAN has that.
DSCP is not reset to 0 directly, only indirectly when the "trust mode" is
"trust cos"
I.E.: PC sends DSCP EF, port receives it and does not have any COS, so there
is nothing to reset. It uses the default port CoS, which as you can see is
0. It then plugs that 0 into internal DSCP mapping table to find out CoS and
DSCP values, and set them accordingly... but, there is a catch. DSCP Reqrite
has to be ON for it to set DSCP to something else.
On Thu, Jan 8, 2009 at 9:30 PM, Rookie Ccie <rookie.ccie@gmail.com> wrote:
> Dear Experts,
>
> If I enable cat qos trust boundary feature on a 3560 using *mls qos trust
> device cisco-phone* command and enable an inbound policy map (to match
> specific PC traffic) on the same interface, what will be the behaviour ?
>
> Rgds
>
>
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-- Pavel Bykov ---------------- Don't forget to help stopping the braindumps, use of which reduces value of your certifications. Sign the petition at http://www.stopbraindumps.com/Blogs and organic groups at http://www.ccie.net
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