MPLS traceroute

MPLS traceroute displays the path that an MPLS LSP tunnel travels from the ingress node to the egress node to locate errors on the tunnel. MPLS traceroute consecutively sends MPLS echo requests along the LSP tunnel, with the TTL increasing from 1 to a specific value. Each hop along the tunnel returns an MPLS echo reply to the ingress due to TTL timeout so the ingress can collect information about each hop along the tunnel. This information allows you to locate the failed node or access information for each hop, for example, the label allocated by each downstream hop.