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Oct 28

You Need to Know About The Importance of RIP Protocol

RIP Protocol

RIP is a distance vector protocol that uses hop count as a routing metric. It describes how routers should share information while moving traffic through LANs.

RIP operates on the application layer of the OSI model, its configuration process for the is very simple. When IP addresses are assigned to the computers and interfaces of routers, developers can issue the router RIP command which tells the router to enable RIP followed by the network command, which allows users to identify which networks they want to work with.

Each RIP router maintains list of all the destinations the router knows how to reach in a table. Each router broadcasts its entire routing table to its closest neighbours every 30 seconds. The neighbours, in return, pass the information on to their nearest neighbours, and so on, until all RIP hosts within the network have the same knowledge of routing paths which is known as Convergence.

If a router receives an update on a route, and if the new path is shorter, it updates its entry in the table with the length and next-hop address of the shorter path. If the new path is longer, it waits, which called as Hold Down period to see if next updates reflect the higher value. It will only update the table entry if the new, longer path has been found to be stable.

If a router crashes, it will be discovered by the network as the router stops sending updates to its neighbours. If a given route in the routing table isn’t updated across six successive update cycles RIP router will drop that route and let the rest of the network know about the problem through its own periodic updates.

RIP timers:

  • Update: The update timer is default timing of routing information sent or received by the routers operating RIP is 30 seconds. Using Update timer, the routers exchange their routing table periodically.
  • Invalid: The destination router is considered as invalid if no update recorded until 180 seconds. In this case, the destination router mark hop count as 16 for that router and it called as Invalid Timer.
  • Hold down: Hold down is the time when the router waits for neighbour router to respond. If the router cannot respond within a given time, it is declared dead. It is 180 seconds by default.
  • Flush: The time after which the entry of the path will be flushed if it doesn’t respond within the flush time. It is 60 seconds by default.

Features of RIP:

  • Network updates are exchanged periodically.
  • Routing information is always broadcasted.
  • Full routing tables are sent in updates.
  • Routers always trust on routing information received from neighbour routers. This is also known as Routing on rumours.

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