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This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.

	Title		: LSP Hierarchy with Generalized MPLS TE
	Author(s)	: K. Kompella, Y. Rekhter
	Filename	: draft-ietf-mpls-lsp-hierarchy-08.txt
	Pages		: 13
	Date		: 2002-9-11
	
To improve scalability of Generalized Multi-Protocol Label Switching
(GMPLS) it may be useful to aggregate Label Switched Paths (LSPs) by
creating a hierarchy of such LSPs.  A way to create such a hierarchy
is by (a) a Label Switching Router (LSR) creating a Traffic
Engineering Label Switched Path (TE LSP), (b) the LSR forming a
forwarding adjacency (FA) out of that LSP (by advertising this LSP as
a Traffic Engineering (TE) link into the same instance of ISIS/OSPF
as the one that was used to create the LSP), (c) allowing other LSRs
to use FAs for their path computation, and (d) nesting of LSPs
originated by other LSRs into that LSP (by using the label stack
construct).
This document describes the mechanisms to accomplish this.

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