Q. Do the Catalyst 2900 XL and 3500 XL series switches honor the incoming Class of Service (CoS) values in dot1p tags from IP phones?
A. Yes, Catalyst 2900 XL and 3500 XL series switches do honor the incoming Class of Service (CoS) value in the dot1q tag. All the ports are considered trusted ports by default. Since dot1q does not tag the native VLAN traffic, you need to issue the switchport priority default <0-7> interface level configuration command to classify the incoming untagged packet as desired. The switchport priority default <0-7> command can be issued to provide CoS equivalent egress scheduling. Also, if the egress port is a trunk port, the ingress CoS or port default priority configuration will be marked in the outgoing frames as CoS values for the far-end device to treat them with the desired higher priority.
Sorry I can't explain it in detail or with examples. I was thinking that the FAQ might have an answer for your original question.
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