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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Multiprotocol Label Switching Working Group of the IETF.

	Title		: MPLS Loop Prevention Mechanism
	Author(s)	: Y. Ohba, Y. Katsube,  E. Rosen, P. Doolan
	Filename	: draft-ietf-mpls-loop-prevention-03.txt
	Pages		: 40
	Date		: 27-Apr-00
	
This paper presents a  simple mechanism,  based on 'threads',  which
can  be  used to prevent 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.

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