From: Darby Weaver (ccie.weaver@gmail.com)
Date: Mon Jan 19 2009 - 21:33:09 ARST
*DSCP Transparency *
*DSCP Transparency is a Cat3560 feature.*
Global command that is disabled by default. If DSCP transparency is enabled
by using the no mls qos rewrite ip dscp command, the switch does not modify
the DSCP field in the incoming packet, and the DSCP field in the outgoing
packet is the same as that in the incoming packet.
Cat3560(config)# mls qos rewrite ip dscp
disable DSCP transparency to allow switch to modify DSCP values based on
trust or ACL
-OR-
Cat3560(config)# no mls qos rewrite ip dscp
Cat3560(config-if)# mls qos trust [cos | dscp ] does the same thing per
interface
*Passthrough Option is a 3550 Feature:*
Cat3550(config-if)# mls qos trust [cos | dscp] pass-through [ dscp | cos]
Forces Cat to treat CoS and DSCP independently. So, it trusts one and
doesn't change the other marked as pass-through.
On 1/19/09, Raghav Bhargava <raghavbhargava12@gmail.com> wrote:
>
> HI experts,
>
> I am not able to understand to the DSCP Transparency Mode in QOS. Can
> anyone shed some light on it.
> I am studying it from the Configuration Guide of Catalyst 3560.
>
> --
> Warm Regards
> Raghav
>
>
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