Microloop prevention by introducing a local convergence delay

Document Type Replaced Internet-Draft (rtgwg WG)
Authors Stephane Litkowski  , Bruno Decraene  , Clarence Filsfils  , Pierre Francois 
Last updated 2015-10-14
Replaced by RFC 8333
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-rtgwg-uloop-delay
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


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


Stephane Litkowski (stephane.litkowski@orange.com)
Bruno Decraene (bruno.decraene@orange.com)
Clarence Filsfils (cfilsfil@cisco.com)
Pierre Francois (pierre.francois@imdea.org)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)