Extension of traceroute over MPLS tunnels

traceroute mpls bgp enables you to perform end-to-end LSP traceroute by having the transit routers provide information to the ingress router about the start and ending of new tunnels for the following cases:

• For hierarchical LSPs for the following use cases:
• LBGP over LDP (traceroute explores all ECMP paths)
• LBGP over RSVP (traceroute explores all ECMP paths)
• LDP over RSVP (traceroute explores all ECMP paths)
• RSVP over BYPASS
• For stitched LSP case for LDP stitched to labeled BGP

The mechanism by which this is accomplished is explained in RFC 6424, which extends RFC 4370. Use traceroute mpls bgp as a debugging tool to locate MPLS BGP forwarding issues in a network. The traceroute mpls bgp command is supported on all platforms.