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Interior Gateway Protocol is nothing but intra-AS routing protocol. It determines how routing is performed within an autonomous system. The intra routing protocols are Routing Information Protocol : (RIP) RIP is the distance vector routing protocol. Participating machines in RIP are participated as active and passive machines. Active machines participate in adverting the route and passive machines do not advertise but they listen to RIP messages and use them to update their routing table. Routing updates are exchanged( broadcast) between neighbors approximately every 30 seconds. This update message is called as RIP response message or RIP advertisement. In RIP routers apply hysteresis when it learns from another router. Hysteresis means router does not replace the route with an equal cost route. It will improve performance and reliability.