Configuring MPLS OAM for a PW
Virtual Circuit Connectivity Verification (VCCV) is an L2VPN PW OAM function to verify PW connectivity in data plane. VCCV can be implemented in the following modes:
On-demand mode—Execute the ping mpls pw command to trigger PW connectivity detection.
Proactive mode—Configure BFD for a PW to test PW connectivity.
The packets used to verify PW connectivity are collectively referred to as "VCCV packets." A PE transfers VCCV packets through a control channel (CC).
The switch supports only the router-alert CC that identifies a VCCV packet by adding an MPLS router alert label before the PW label.
Connectivity Verification (CV) tools include the following types:
MPLS ping—Uses MPLS ping to verify PW connectivity.
BFD—Uses BFD to verify PW connectivity. BFD packets use IP/UDP encapsulation (with IP/UDP headers).