A New Internet-Draft is available from the on-line Internet-Drafts
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Title : MANET Extension of OSPF using CDS Flooding
Author(s) : P. Spagnolo, R. Ogier
Filename : draft-ogier-manet-ospf-extension-09.txt
Pages : 59
Date : 2007-3-5
This document specifies an extension of OSPF for IPv6 to support
mobile ad hoc networks (MANETs). The extension, called OSPF-MDR, is
designed as a new OSPF interface type for MANETs. OSPF-MDR is based
on the selection of a subset of MANET routers, consisting of MANET
Designated Routers (MDRs) and Backup MDRs. The MDRs form a connected
dominating set (CDS), and the MDRs and Backup MDRs together form a
biconnected CDS for robustness. This CDS is exploited in two ways.
First, to reduce flooding overhead, an optimized flooding procedure
is used in which only (Backup) MDRs flood new LSAs back out the
receiving interface; reliable flooding is ensured by retransmitting
LSAs along adjacencies. Second, adjacencies are formed only between
(Backup) MDRs and a subset of their neighbors, allowing for much
better scaling in dense networks. The CDS is constructed using 2-hop
neighbor information provided in a Hello protocol extension. The
Hello protocol is further optimized by allowing differential Hellos
that report only changes in neighbor states. Options are specified
for originating router-LSAs that provide full or partial topology
information, allowing overhead to be reduced by advertising less
topology information.
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