Re: VLAN based QoS

Yes, trust dscp implies that you are trusting the dscp marking "on
any traffic coming from any device on that vlan (i.e class
class-default) " but for http traffic coming from any webserver on
that vlan you are overriding or setting the dscp marking to what you
have specified.

HTH

On 5/13/10, hopalong <ccieangel2_at_googlemail.com> wrote:
> Hi
>
> I am configuring VLAN based QoS on a catalyst switch.
>
> I have matched the traffic thus:
>
> ip access-list extended HTTP
> permit tcp any eq 80 any
> !
> class-map HTTP
> match access-group name HTTP
>
> and then I need to change the dscp value:
>
> policy-map VLAN46
> class HTTP
> set dscp 16
>
> and then apply:
>
> interface vlan 46
> service-policy input VLAN46
>
> My question is that the solution provided has an additional line in the
> class-map HTTP which reads:-
>
> class class-default
> trust dscp
>
> is this strictly necessary to the solution ?
> Thanks for reading!
>
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Warm Regards,
Eseosa
CCIE #23782
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