MPLS ping

MPLS ping tests the connectivity of an LSP tunnel or a PW. At the ingress node, MPLS ping adds the label associated with a tunnel into an MPLS echo request and sends it to the egress node over the tunnel. The egress node processes the request and returns an MPLS echo reply to the ingress node. An MPLS echo reply with a success notification indicates that the tunnel is available for data forwarding, and an MPLS echo reply with an error code indicates that the tunnel has failed.