Operation Manual – Routing ProtocolH3C S7500 Series Ethernet Switches Chapter 3 RIP Configuration3-2z Route tag: Identifies whether a route is of internal routing protocol or externalrouting protocol.III. RIP timersAs defined in RFC 1058, RIP employs three timers: Period update, Timeout, andGarbage-collection.z Period update timer: This timer is used to periodically trigger routing informationupdate so that the router can send all RIP routes to all the neighbors.z Timeout timer: If a RIP route is not updated (that is, the switch does not receiveany routing update from the neighbor) within the timeout time of this timer, theroute is considered unreachable.z Garbage-collection timer: An unreachable route will be completely deleted fromthe routing table if no update for the route is received from the neighbor beforethis timer times out.3.1.2 RIP Initialization and Running ProcedureThe RIP initialization and running procedure is described as follow:z Once RIP is enabled on a router, the router broadcasts or multicasts requests toits neighbors. Upon receiving the packet, each neighbor running RIP returnsresponses containing its routing table information.z When this router receives the responses, it updates its local routing table andsends triggered updates to the neighbor. Upon receiving the triggered updates,the neighbor sends the triggered updates to all its neighbors. After a series ofupdate triggering processes, each router can get and keep the updated routinginformation.z By default, RIP sends its routing table information to its neighbors every 30seconds. Upon receiving the packets, the neighbors maintain their own routingtables and select optimal routes, and then advertise update information to theirrespective neighbors so as to make the updated routes known globally.Furthermore, RIP uses the timeout mechanism to handle the timeout routes soas to ensure real-time and valid routes.RIP is commonly used by most IP router suppliers. It can be used in most campusnetworks and the regional networks that are simple and less dispersive. For largerand more complicated networks, RIP is not recommended.3.2 RIP Configuration Task ListComplete the following tasks to configure RIP:
