From: toonsh dosh (toonsh@hotmail.com)
Date: Fri Sep 09 2005 - 05:18:54 GMT-3
Hi Richard
Thanks for the reply. I have tested the configuration on the 3550 and it
does not seem to work. I was doing some reading on deploying QoS on an
enterprise campus and it seemed to confirm that this should work.
Not sure if 3750 works in the same manner.
perhaps someone who has managed to get this to work on the 3550 platform can
perhaps confirm that it can be done.
Thanks
>From: richard.harvey@NBS.NHS.UK
>To: toonsh@hotmail.com, ccielab@groupstudy.com
>Subject: RE: Setting ingress DSCP value on 3550 L2 port
>Date: Fri, 9 Sep 2005 9:14:02 +0100
>
>The traffic should be marked given this setup - I have used something
>similar on the 3750 and have seen traffic marked with a sniffer.
>
>Something that took me a while to work out though is exactly when/where the
>DSCP marking will take place. On the 6500 sup2 platform for instance,
>traffic will not be DSCP marked when being switched within the same VLAN.
>To be effected by the ingress marking policy, the traffic needs to cross to
>another VLAN via a layer-3 interface (configured on the MSFC). This makes
>sense, as DSCP is a layer-3 function, and the marking would take place on
>the policy feature card (PFC).
>
>However, on the 3750 platform traffic staying within the same VLAN appears
>to be marked without being processed by a layer-3 VLAN interface. Other
>than Cisco's documentation on 6500 architecture, I can find no
>comprehensive document to confirm this.
>
>Richard
>
>
>
>
>-----Original Message-----
>From: MIME :toonsh@hotmail.com Sent: 08 September 2005 16:29
>To: ccielab@groupstudy.com
>Subject: Setting ingress DSCP value on 3550 L2 port
>
>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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