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 Working Group of the IETF.
Title : Framework for Loop-free convergence using oFIB
Author(s) : Mike Shand
Stewart Bryant
Stefano Previdi
Clarence Filsfils
Pierre Francois
Olivier Bonaventure
Filename : draft-ietf-rtgwg-ordered-fib-09.txt
Pages : 27
Date : 2013-01-31
Abstract:
This document describes the framework of a mechanism for use in
conjunction with link state routing protocols which prevents the
transient loops which would otherwise occur during topology changes.
It does this by correctly sequencing the forwarding information base
(FIB) updates on the routers.
This mechanism can be used in the case of non-urgent (management
action) link or node shutdowns and restarts or link metric changes.
It can also be used in conjunction with a fast re-route mechanism
which converts a sudden link or node failure into a non-urgent
topology change. This is possible where a complete repair path is
provided for all affected destinations.
After a non-urgent topology change, each router computes a rank that
defines the time at which it can safely update its FIB. A method for
accelerating this loop-free convergence process by the use of
completion messages is also described.
The technology described in this document has been subject to
extensive simulation using real network topologies and costs, and
pathological convergence behaviour. However the mechanism described
in this document are purely illustrative of the general approach and
do not constitute a protocol specification. The document represents
a snapshot of the work of the Routing Area Working Group at the time
of publication and is published as a document of record. Further
work is needed before implementation or deployment.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-ordered-fib
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-rtgwg-ordered-fib-09
A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-ietf-rtgwg-ordered-fib-09
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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