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It shows how to configure RIP at two routers and the process of synchronizing routing information with Request, Response.

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    1. RIP BasicRIP tutorialwith pictures Watch animation to learn networking. It shows how to configure RIP at two routers and the process of synchronizing routing information with Request, Response. This pictured tutorial takes screenshots fromRIP Basic Animation. OK to republish this slide. Please use hyperlink to point to its source.

    2. RIP animations RIP basic It shows how to configure RIP at two routers and the process of synchronizing routing information with Request, Response. Split Horizon Observe RIP operations in details: Request and Response packet structure, split horizon, periodical flooding routing info.. Link Failover It animates the steps of finding new routes upon a link down event. Router poison RIP routers floods Response every 30 seconds. If a router has not heard from a neighbor for 180 seconds, it thinks the nieghbor is unreachble. It floods a Response to announce (with route metric 16.) Neighbors propagate this Response to spread out through the RIP network. This is called route poisoning. Equal cost - route poison When receivingg a route poison, a router does not re-flood route poison if it has other paths to reach the unreachable router. Garbage Collection After 180 second of silence from a neighbor, the router declares the neighbor is unreachable and floods route poison. However, this obsolete route stays in RIP database for another 60 seconds (Garbage Collection Timer). When this timer expires, RIP removes the router from RIP datase. Pinghole Congestion RIP uses hop count to calculate path cost, not bandwidth. If a router has two equal cost paths to reach a destination, it load balances traffic. However, if one path has a slower link, it is congested and becomes a bottleneck. This is called RIP pinhole congestion. 2014/3/10 2

    3. Overview: RIP BasicsAnimation link Goal: Visualize RIP configuration and exchanging of Request and Reponse to discover new routes. Topology: Two hosts H1 and G2 are connected to two RIP routers as H1-R1-R2-H2. Steps: 1) Configure R1 IP address and start RIP. (R2 has already started RIP. ) 2) R1 and R2 flood Request and R2 to exchange routing information. 3)H1 ping H2 is successful.

    4. Configure IP address First, configure the IP addresses for R1 and R2's interfaces. See actual commands in R1's command line window.

    5. R1: Start RIP, flood Request Start RIP at R1. It floods Request to all ports immediately. Yjere are two types of RIP packets: - Request. R1 sends Request to ask its neighbors their routing information. - Response. A RIP router sends Response periodically to neighbors of its routing information.

    6. R2: Return Response When R2 receives R1's Request, it sends its routing data in a Response to R1.

    7. R1: update routing table When R1 receives Response from R2, it discovers a new destination and adds a new entry (R,, E0/0) to its rotuing tabe. Note: In the routing table, Type is C for directly connected networks. Type is R for RIP routes.

    8. R1: flood Response Now R1 floods a Response which contains R1's routing data. Note: In real wirkd, after starting RIP, the router floods a Request and a Response at the same time. In this scenario, we flood Request first to ckarify the transaction.

    9. R2: update routing table When R2 recevies Response from R1, it adds a new route (R,, E0/0”) to its routing table.

    10. H1 Ping H2 此时R1和R2都有了完整的路由表。H1 ping H2,Ping通了。

    11. FAQ • What is RIP? • How does RIP work? • How does RIP calculate routes? ( answers in the Comments box )

    12. What is • VLAB: Virtual Lab • Theory: Visualize key points of network protocols to help beginners grasp the basic ideas quickly. • Lab: Visualize network activities with packets and router states captured from network simulators (dynamips, packet tracer, and ns2. • Interactively control animation: packet headers, protocol state tables. • Vlab usage • Self learning, teaching aids, lab book.