MPLS Data Plane Troubleshooting
With the MPLS control plane working properly, the MPLS data plane should work without further troubleshooting. There are, however, two cases in which the MPLS operation on the data plane might be affected:
CEF switching might not be functional on individual interfaces.
Non-MPLS devices in the forwarding path might affect propagation of labeled packets.
Monitoring Interface-Level CEF
Configuring CEF on the LSR does not guarantee that the CEF switching will be performed on all interfaces. For example, you can disable CEF switching on an individual physical interface with the no ip route-cache cef interface configuration command. You can verify proper CEF operation on an individual interface with the show cef interface ...
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