RFC 3063 (rfc3063) - Page 1 of 44
MPLS Loop Prevention Mechanism
Alternative Format: Original Text Document
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