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Routing Information Protocol
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{{Short description|Computer network protocol}} {{IPstack}} {{Use dmy dates|date=September 2020}} The '''Routing Information Protocol''' ('''RIP''') is one of the oldest [[distance-vector routing protocol]]s which employs the [[Hopcount|hop count]] as a [[Metrics (networking)|routing metric]]. RIP prevents [[routing loop problem|routing loops]] by implementing a limit on the number of [[Hop (networking)|hops]] allowed in a path from source to destination. The largest number of hops allowed for RIP is 15, which limits the size of networks that RIP can support. RIP implements the [[split horizon]], [[route poisoning]], and [[holddown]] mechanisms to prevent incorrect routing information from being propagated. In RIPv1 routers broadcast updates with their routing table every 30 seconds. In the early deployments, [[routing table]]s were small enough that the traffic was not significant. As networks grew in size, however, it became evident there could be a massive traffic burst every 30 seconds, even if the routers had been initialized at random times. In most networking environments, RIP is not the preferred choice of [[routing protocol]], as its [[Convergence (routing)#Convergence time|time to converge]] and [[scale (computing)|scalability]] are poor compared to [[Enhanced Interior Gateway Routing Protocol|EIGRP]], [[Open Shortest Path First|OSPF]], or [[IS-IS]]. However, it is easy to configure, because RIP does not require any parameters, unlike other protocols. RIP uses the [[User Datagram Protocol]] (UDP) as its transport protocol, and is assigned the reserved [[port number]] 520.<ref name="IANA">{{cite web|publisher=The [[Internet Assigned Numbers Authority]] (IANA)|title=Service Name and Transport Protocol Port Number Registry|website=www.iana.org|page=10|access-date=25 February 2022|url=https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?&page=10}}</ref>
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