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Label Switched Paths (LSP) Hierarchy with Generalized Multi-Protocol Label Switching (GMPLS) Traffic Engineering (TE) (RFC4206)

IP.com Disclosure Number: IPCOM000130546D
Original Publication Date: 2005-Oct-01
Included in the Prior Art Database: 2005-Oct-26
Document File: 15 page(s) / 32K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Kompella: AUTHOR [+2]

Abstract

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 text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 9% of the total text.

Network Working Group                                        K. Kompella
Request for Comments: 4206                                    Y. Rekhter
Category: Standards Track                               Juniper Networks
                                                            October 2005


               Label Switched Paths (LSP) Hierarchy with
          Generalized Multi-Protocol Label Switching (GMPLS)
                        Traffic Engineering (TE)

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   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.


Kompella & Rekhter          Standards Track                     [Page 1]
RFC 4206              LSP Hierarchy with GMPLS TE           October 2005


Table of Contents

   1. Overview ........................................................2
   2. Specification of Requirements ...................................3
   3. Routing Aspects .................................................4
      3.1. Traffic Engineering Parameters .............................4
           3.1.1. Link Type (OSPF Only) ...............................5
           3.1.2. Link ID (OSPF Only) .................................5
           3.1.3. Local and Remote Interface IP Address ...............5
           3.1.4. Local and Remote Link Identifiers ...................5
           3.1.5. Traffic Engineering Metric ..........................5
           3.1.6. Maximum Bandwidth ...................................5
           3.1.7. Unreserved Bandwidth ........