In Multiprotocol Label Switching (MPLS) environments, the traceroute command behaves differently than in non-MPLS environments.
The MPLS traceroute command works slightly differently from the normal traceroute command because the routers running MPLS exchange labels to make forwarding decisions instead of IP routing information.
For complete details on how the traceroute command works in MPLS refer to:
The Traceroute Command in MPLS
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