Avoiding transient loops during IGP Convergence in IP Networks

Tue, 05/15/2007 - 12:41 by Pierre François


When the topology of an IP network changes due
to a link failure or a link metric modification, the routing tables
of all the routers must be updated. Each of those updates may
cause transient loops. In this paper, we prove that by ordering
the updates of the routing tables on the routers, it is possible
to avoid all transient loops during the convergence of ISIS or
OSPF after a planned link failure, an unplanned failure of a
protected link and after a link metric modification. We then
propose a protocol that allows the routers to order the update
of their routing tables to avoid transient loops without requiring
any complex computation.

Pierre Francois and Olivier Bonaventure
Proceedings of IEEE INFOCOM 2005, March 2005. IEEE.
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