Routing oscillations using BGP multiple paths advertisement

Wed, 07/04/2007 - 09:36 by Virginie Van den Schrieck


The advertisement of multiple paths for the same prefix in the Border
Gateway Protocol is possible by using an extension to the attributes
developed for multiprotocol transfer. This allows better path
diversity in the adj-rib-ins, and can prevent some routing
inconsistencies with Route Reflection. However, if not carefully
used, this mechanism can also introduce routing oscillations and
inconsistencies in topologies with Route Reflection that were correct
without this extension.

This document describes four types of routing inconsistencies that
occur in badly designed topologies when more than one path is
advertised by the routers.

Virginie Van den Schrieck and Olivier Bonaventure
Internet draft, June 2007.
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