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Since link-state routing requires the topology database to be synchronized across the network, OSPF and IS-IS perform topology flooding using a reliable algorithm. Such an algorithm is very difficult to design for ad hoc wireless networks, so OLSR doesn't bother with reliability; it simply floods topology data often enough to make sure that the database does not remain unsynchronized for extended periods of time.
===Multipoint relays===
Multipoint relays (MPRs) relay messages between nodes. They also have the main role in [[routing]] and selecting the proper route from any source to any desired destination node.
MPRs advertise link-state information for their MPR selectors (a node selected as a MPR) periodically in their control messages. MPRs are also used to form a route from a given node to any destination in route calculation. Each node periodically broadcasts a Hello message for the link sensing, neighbor detection and MPR selection processes.<ref>''Performance Comparison of Wireless Mobile AdHoc Network Routing'' - Arun Kumar, Lokanatha C. Reddy , Prakash S. Hiremath {{what?|date=March 2013}}</ref>
== Benefits ==
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