Re: Setting ingress DSCP value on 3550 L2 port

From: Niche (jackyliu419@gmail.com)
Date: Thu Sep 08 2005 - 21:48:41 GMT-3


Hi,

As far as I can remember, dscp is layer 3 marking, so if you want to do what
you want and the you don't have any cos marking in the packet in advance
before it enter into the cat3550. You should create a cos-dscp mapping in
global configuration, then set the default cos of the incoming traffic to
that related dscp value.

Then apply the service policy on the outgoing interface and use access-list
to check again at the remote end.

Again, just my thinking, please correct me if I have anything wrong =)

Jacky

On 9/8/05, toonsh dosh <toonsh@hotmail.com> wrote:
>
> Hi,
>
> I have just run some tests trying to set ingress traffic on a 3550 L2 port
> to a DSCP value of 45.
>
> mls qos
> !
> class-map match-all ICMP
> match access-group 101
> !
> !
> policy-map TEST
> class ICMP
> set dscp 45
> !
> access-list 101 permit icmp any any
> !
> int f0/1
> service-policy input TEST
>
> If I run a trace on the receiving end I see the DSCP value has remained
> unchanged. Am I missing something ? What are some other ways of setting
> ingress traffic PREC or DSCP values.
>
> Thanks
>
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