Sorry to ask the stupid question, but I can't figure this out. I am running a converged LAN supporting about 1500 devices (1000 computers, 500 phones). I am running two 3750G-24TS switches (running 12.2(35)SE2) at Layer 3 as my core. They support all my voice and data SVIs. My routers on my WAN edge use DSCP markings for QoS on my outbound links.
I'm trying to move the DSCP marking off the routers and on to the multi-layer switches. I have the ACLs, class-maps, and policy-maps defined on the switch. IP CEF is enabled. I did remember to issue the global "mls qos" command. I did remember to attach the service-policy input on the interface I'm testing with. "Show mls qos" shows QoS enabled, and ip packet dscp rewrite enabled. "show mls qos interface g1/0/27" shows the correct policy-map attached to the interface, but shows 0 packets offered and the ACLs show 0 packets matched. I have tried attaching the service-policy on both the physical interfaces and on the SVIs. The only thing I'm trying to do on the 3750Gs right now is classify and mark -- I'm letting the routers use WRED to drop excess traffic. Any ideas why I'm not getting any matches? I'm guessing I missed a global command somewhere, but for the life of me, I can't figure it out.
Right now, I'm stuck doing the classification and DSCP marking on the ingress interfaces of the routers (3725s), and WRED on the egress interfaces. That works fine, so I think I've got the basic concepts down. Any thoughts?