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6292
November 24th, 2010 03:00
QoS issue on PCT 62xx Access layer
I have just started looking at QoS on our PCT 62xx switches.
I have setup a small QoS policy to catch some business and VoIP traffic. If I check the policy-map counters everything is as expected and I can also see the DSCP classificion in our Sflow monitor.
However, some of our IP phone inject their own DSCP. So I have set 'classofservice trust untrusted' on edge ports; but I expected this to remove any DSCP flags but it does not seem to as I can see these rogue DSCP values in Sflow as well.
I want to remove all DSCP flags at the edge, then reassign through class-map and policy-map and have the core trust the vlaues from the edge.
How do I remove all DSCP at the edge?
bh1633
909 Posts
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December 1st, 2010 08:00
You want to "re-mark". The 62xx can do this. There is an example in the Differentiated Services section of the configuration guide.
http://support.dell.com/support/edocs/network/pc62xx/en/Config/config.zip
bi6bleboy
2 Posts
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December 1st, 2010 11:00
My question was: How do I remove all DSCP at the edge?
I can easity mark DSCP and the document you indicated was my starting point.
With an untrusted port the traffic is routed to the ports default queue but if it is then passed to a core switch I want the DSCP marking removed (set to CS0) unless it is re-marked at the edge.
Should I simply add a MATCH ANY and MARK DSCP CS0? to every port but then how do the rules get applied - I need a rule that says - If it has not be matched then set DSCP to CS0.
bh1633
909 Posts
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December 2nd, 2010 07:00
The rules are applied in order entered so make your "match any" rule the last rule.