The IESG has received a request from the Routing Area Working Group WG (rtgwg) to consider the following document: - 'Framework for Loop-free convergence using oFIB' <draft-ietf-rtgwg-ordered-fib-08.txt> as Informational RFC The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the ietf@ietf.org mailing lists by 2013-01-31. Exceptionally, comments may be sent to iesg@ietf.org instead. In either case, please retain the beginning of the Subject line to allow automated sorting. 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 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 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 file can be obtained via http://datatracker.ietf.org/doc/draft-ietf-rtgwg-ordered-fib/ IESG discussion can be tracked via http://datatracker.ietf.org/doc/draft-ietf-rtgwg-ordered-fib/ballot/ The following IPR Declarations may be related to this I-D: http://datatracker.ietf.org/ipr/875/
