The IESG has approved the Internet-Draft LSP Hierarchy with Generalized MPLS TE <draft-ietf-mpls-lsp-hierarchy-08.txt> as a Proposed Standard. This document is the product of the Multiprotocol Label Switching Working Group. The IESG contact persons are Bert Wijnen and Scott Bradner. Technical Summary This document describes the mechanisms to aggregate Label Switched Paths (LSPs) by creating a hierarchy of such LSPs. These mechanisms can be used to improve scalability of Generalized Multi-Protocol Label Switching (GMPLS). Such a hierarchy can be created 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). Working Group Summary The MPLS working group supported publication of this document. Protocol Quality This document was reviewed for the IESG by Scott Bradner.
