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===Topology reduction===
In some cases, it is reasonable to reduce the number of nodes that generate LSA messages. For this reason, a topology reduction strategy can be applied, in which only a subset of the network nodes generate LSA messages. Two widely studied approaches for topology reduction are [[Optimized Link State Routing Protocol#Multipoint relays|multipoint relays]] that are at the base of the [[Optimized Link State Routing Protocol]] (OLSR) but have also been proposed for OSPF<ref>{{Cite journal|url=https://tools.ietf.org/html/rfc5449|title = OSPF Multipoint Relay (MPR) Extension for Ad Hoc Networks|date = February 2009|last1 = Nguyen|first1 = Dang-Quan|last2 = Clausen|first2 = Thomas H.|last3 = Jacquet|first3 = Philippe|last4 = Baccelli|first4 = Emmanuel| doi=10.17487/RFC5449 |doi-access = free|url-access = subscription}}</ref> and [[connected dominating set]]s that were again proposed for OSPF.<ref>{{Cite journal|url=https://tools.ietf.org/html/rfc5614|title = Mobile Ad Hoc Network (MANET) Extension of OSPF Using Connected Dominating Set (CDS) Flooding|date = August 2009|last1 = Ogier|first1 = Richard|last2 = Spagnolo|first2 = Phil| doi=10.17487/RFC5614 |url-access = subscription}}</ref>
===Fisheye State Routing===
With [[Fisheye State Routing]] (FSR), the LSA are sent with different time-to-live values to restrict their diffusion and limit the overhead due to control messages. The same concept is used also in the [[Hazy Sighted Link State Routing Protocol]].
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