We have some 4500/4900/6500 switches with 100/10000 ethernet ports used for WAN connectivity on slower speed links (6mb/3mb). We need to apply QoS on these ports to give priority to RTP traffic. We have tried to apply the MQC configs built for our 3800/7200 routers and have found that the catalysts will reject the outbound service-policy with any sort of priority or policing configured in the policy-map. Is this because the Ethernet line cards already have the 1P3Q8T queuing built in? If so, what is the solution? Use MCQ to mark traffic inbound on the other ports, and trust the COS on the outbound WAN port and let the built in queuing do its thing? In addition, how do we make the Ethernet port know that there is only a 6mb link, not a 100m or 1000m link?