From: richard.harvey@nbs.nhs.uk
Date: Fri Sep 09 2005 - 05:14:02 GMT-3
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
This archive was generated by hypermail 2.1.4 : Sun Oct 02 2005 - 14:40:14 GMT-3