We have 7604 with WS-SUP720-3B and WS-X6724-SPF 24 ports card, running 12.2(33)SRA5. The access-list selecting the interesting traffic to be marked for business class (dscp af42/43) at the lan interface service policy does not increment counters, while the policy map on the output wan interface is showing traffic forwarded in business class. The lan interface does not trust incoming qos values. The behavior does not change on routers upgraded to SRB4. But similar configuration on 7206VXR shows incrementing counters for the access-list. So I assume qos is working correctly. Does somebody have an explanation?
The ACLs are still doing their job and incoming LAN traffic is getting marked. As Sam suggested, 'show policy-map interface' will guide you on what's getting matched.