Cisco Router Qos troubleshooting

How can I test en troubleshooting  Qos in Cisco router 2651XM en cisco router 878?
Qore_NetworksAsked:
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Reid PalmeiraTelecom EngineerCommented:
what kinds of things are you trying to troubleshoot?

most comprehensively, I'd suggest trying to capture a stream of packets on the WAN side of the cisco router to see what the traffic flow looks like on ingress and egress.

as far as cisco CLI commands, typically
show policy
show policy-map class
show policy-map interface.

see also: http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120xe/120xe5/mqc/mcli.htm
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