для Cisco Cisco IOS Software Release 12.2(27)SBC

The following are prerequisites for using the MPLS EM—MPLS LSP Multipath Tree Trace feature: 

You must understand the concepts and know how to use MPLS LSP ping or traceroute as described 
in the 

document.

The routers in your network must be using an implementation based on RFC 4379, Detecting 
Multi-Protocol Label Switched (MPLS) Data Plane Failures.

You should know the following about your MPLS network:

The topology

The number of links in your network

The expected number of LSPs, and how many LSPs

Understand label switching, forwarding, and load balancing. 

All restrictions that apply to the MPLS Embedded Management—MPLS LSP Ping and LSP 
Traceroute feature also apply to the MPLS EM—MPLS LSP Multipath Tree Trace feature.

Multiple LSP paths are not discovered unless all routers in the MPLS core support an RFC 4379 
implementation of Detecting Multi-Protocol Label Switched (MPLS) Data Plane Failures.

MPLS LSP multipath tree trace is not expected to operate in networks that support time-to-live 
(TTL) hiding.