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	Title		: Backtrace Messages for Label Switched Paths
	Author(s)	: H. Desineni, K. Avasarala
	Filename	: draft-kishan-lsp-btrace-03.txt
	Pages		: 19
	Date		: 2002-9-4
	
Label switched path (LSP) backtrace is a method to backtrack the 
paths followed by packets in a particular forwarding equivalence 
class (FEC). This document describes the encoding and procedures for 
new label distribution protocol (LDP) messages, the backtrace message 
and backtrace reply message used for performing LSP backtrace. The 
backtrace message is sent upstream for an established LSP. The 
backtrace message can be used for LDP LSPs as well as for constraint 
based label switched paths (CR-LSPs). The data requested through a 
backtrace message is encoded into the backtrace reply message. 
Backtrace reply message is sent in downstream direction. It always 
travels towards the tail end of the LSP. Backtrace mechanism 
described in this document can also be used for obtaining additional 
attributes of the LSPs.

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