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	Title		: Backtrace Messages for Label Switched Paths
	Author(s)	: H. Desineni, K. Avasarala
	Filename	: draft-kishan-lsp-btrace-04.txt
	Pages		: 19
	Date		: 2002-10-10
	
Label switched path (LSP) backtrace is a method to backtrack the 
paths followed by packets in a particular multi protocol label 
switching (MPLS) forwarding equivalence class (FEC). This document 
describes encoding and procedures for new label distribution protocol 
(LDP) messages, backtrace message and backtrace reply message used 
for performing LSP backtrace. Backtrace message is sent upstream for 
an established LSP. Backtrace message can be used for LDP LSPs as 
well as for constraint based label switched paths (CR-LSPs). Data 
requested through backtrace message is encoded into backtrace reply 
message. Backtrace reply message is sent in downstream direction. It
always travels towards the tail end of an LSP. Backtrace mechanism 
described in this document can also be used for obtaining additional 
attributes of LSPs.

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