The MPLS WG Archive

["Choudhury, Sanjaya" <Sanjaya.Choudhury@marconi.com>]

	Hi! I have some basic questions on LDP LSPs. I will appreciate,
	if some one can help me with these. 

	Q1. What are the conditions that make a LSR an ingress for a 
	FEC ? (RFC3036, A.1.2 LMp14)


	Q2. If a LSR is an ingress for a FEC, then it is also an "LSP
Ingress"
	(RFC3031, 3.15 , 1) for the LSP associated with the above
	mentioned FEC.  Is my interpretation correct ?

	
	Q3. If an LSR is _not_ an ingress  for a FEC, can unlabelled IP 
	traffic (matching the FEC) be mapped into the LDP LSP corresponding
	to the above mentioned FEC ?
	For example:
		R1-----(FEC1 = L1) ------R2-------(FEC1 = L2)------R3
					|
					|
					R4

	R1: ingress for FEC1, R3: egress for FEC1

	Can/Should unlabelled IP traffic arriving at R2 (from R4 and
matching
	prefix) be "inserted" into the LSP _transiting_ through it ?
	

	Q4. If the answer to the previous question is 'yes', then doesn't
that
	make R2 ingress for that FEC ?
	
	

	
	Thanks,
	sanjay