Catalyst QoS - Cos.

From: William Chen (kwchen@netvigator.com)
Date: Fri Apr 02 2004 - 13:30:21 GMT-3

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Dear all,

   I understand that in Catalyst 3550 QoS. The egress queue of the packets
will depends on the DSCP-COS map. If the egress port is a trunk port, will
the packets actually be marked with COS value according to the DSCP-COS map?

   Moreover, if I use "mls qos tust cos pass-thru dscp" at the ingress, I
understand that the COS-DSCP map is ignored and the internal DSCP will use
the DSCP value of the received packets. How about the egress queue? The
packets go into the egress queue according to the COS or DSCP-COS map?

Best Regards,
William Chen

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