Debug MPLS Packets
You can debug the forwarding of MPLS packets, just as you can debug the forwarding of IP packets. The command is debug mpls packets. However, if you turn on this debug command without further specifying anything, it returns debug output for all label switched packets. This is something that is probably fine in a lab environment, but not in a production network. Fortunately, you can specify an access list that limits the output to certain labeled packets.
Warning
Debugging the forwarding of (labeled) packets can consume many CPU cycles on the router and as such is a dangerous thing to do. When debugging in the data plane—such as debug mpls packets—, be sure you know what you are doing and take the necessary precautions in case ...
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