From: Bill Eyer (beyer@optonline.net)
Date: Wed Aug 27 2008 - 08:07:18 ART
Carlos,
That's correct, when the switch receives the packet that originate in
the PC, which the switch has marked as COS 0, it automatically marks the
DSCP to zero. If for some reason you want a different DSCP value for
your PC traffic, you can modify your switch's cos-dscp map.
Bill
Carlos G Mendioroz wrote:
> I'm trying to nail smth:
> Say you have
>
> (a) - switch - (b) - IP Phone - (c) - Pc
>
> And you have trust device cisco-phone at the switch.
> 1) PC sends frame with DSCP xx (no COS cause no L@ tag),
> 2) phone keeps DSCP and puts COS 0
> 3) switch is trusting phone, but by default copies COS to DSCP
>
> so at (a) packet from PC has DSCP 0. Right ?
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