I-D Action: draft-ietf-rtgwg-uloop-delay-09.txt

internet-drafts@ietf.org Mon, 13 November 2017 01:44 UTC

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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 Routing Area Working Group WG of the IETF.

        Title           : Micro-loop prevention by introducing a local convergence delay
        Authors         : Stephane Litkowski
                          Bruno Decraene
                          Clarence Filsfils
                          Pierre Francois
	Filename        : draft-ietf-rtgwg-uloop-delay-09.txt
	Pages           : 27
	Date            : 2017-11-12

   This document describes a mechanism for link-state routing protocols
   to prevent local transient forwarding loops in case of link failure.
   This mechanism proposes a two-step convergence by introducing a delay
   between the convergence of the node adjacent to the topology change
   and the network wide convergence.

   As this mechanism delays the IGP convergence it may only be used for
   planned maintenance or when fast reroute protects the traffic between
   the link failure time and the IGP convergence.

   The proposed mechanism is limited to the link down event in order to
   keep the mechanism simple.

   Simulations using real network topologies have been performed and
   show that local loops are a significant portion (>50%) of the total
   forwarding loops.

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