Overview of MPLS Segment Routing OAM
MPLS OAM provides two main functions for diagnostics purposes:
OAM draws the information from different information sources of each FEC type to help diagnose the issues. The Nil-FEC forwarding equivalence class type is not associated with a protocol like the other FEC types or an actual forwarding equivalence class, for example, LDP. Nil-FEC does not query BGP or other routing protocols in the control plane, but it validates the data plane programming.
To enable MPLS OAM on Cisco Nexus 3000 Series switches, use the feature mpls oam CLI command. Use the no feature mpls oam CLI command to disable MPLS OAM on Cisco Nexus 3000 Series switches.