RFC 3063 (rfc3063) - Page 1 of 44

MPLS Loop Prevention Mechanism

Alternative Format: Original Text Document
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Network Working Group                                            Y. Ohba
Request for Comments: 3063                                    Y. Katsube
Category: Experimental                                           Toshiba
                                                                E. Rosen
                                                           Cisco Systems
                                                               P. Doolan
                                                       Ennovate Networks
                                                           February 2001


                     MPLS Loop Prevention Mechanism

Status of this Memo

   This memo defines an Experimental Protocol for the Internet
   community.  It does not specify an Internet standard of any kind.
   Discussion and suggestions for improvement are requested.
   Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2001).  All Rights Reserved.

Abstract

   This paper presents a simple mechanism, based on "threads", which can
   be used to prevent Multiprotocol Label Switching (MPLS) from setting
   up label switched path (LSPs) which have loops.  The mechanism is
   compatible with, but does not require, VC merge.  The mechanism can
   be used with either the ordered downstream-on-demand allocation or
   ordered downstream allocation.  The amount of information that must
   be passed in a protocol message is tightly bounded (i.e., no path-
   vector is used).  When a node needs to change its next hop, a
   distributed procedure is executed, but only nodes which are
   downstream of the change are involved.
















Ohba, et al.                  Experimental
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