cos and dscp

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Sep 22nd, 2008

Hi all, If I get my switch to mark the cos values from a specific vlan, when this traffic then moves to the next switch, if I dont set the uplink to trust these frames, what will happen will the frame still keep its marking?

I have this problem too.
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Mark Yeates Mon, 09/22/2008 - 05:36

If you don't configure the trust on the interface the cos value will be changed to back to zero.



m-haddad Mon, 09/22/2008 - 13:40

What mark has said is correct unless the next switch doesn't have mls qos enabled (Globaly). Then the QoS marking will stay and will be forwarded.

mbroberson1 Wed, 10/08/2008 - 05:36

If your ip phones (Avaya in our case) are marking the voice packets such as dscp 46 and call control af31 and you have your cos-dscp map set correctly is it best to trust cos of dscp on the trunks between layer 2 switches? What about the trunk interface on the switch connecting to a router?



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