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Routing Information Protocol (RIP)

Routing Information Protocol (RIP). Josh Timmons, CCNA Datacom II February 15, 2000. RIP -- What is it?. RIP is a rout ing protocol for exchanging routing table information between routers.

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Routing Information Protocol (RIP)

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  1. Routing Information Protocol(RIP) Josh Timmons, CCNA Datacom II February 15, 2000

  2. RIP -- What is it? • RIP is a routing protocol for exchanging routing table information between routers. • Routing updates must be passed between routers so that they can make the proper choice on how to route a packet.

  3. RIP Characteristics • Distance vector routing protocol. • Uses hop count as a path selection metric. • Three types of timers. • Multiple stability features.

  4. Distance Vector Routing Protocol • Each router sends all or part of its routing table in routing updates. However, the updates are only sent to neighboring routers. Cisco Systems Inc.

  5. Hop Count -- Fifteen Hop Limit • Hop count is the sum of all the legs in a route. • After 15 hops, the packet is discarded Lucent Technologies

  6. Timers • Routing-update timer • By default, routers send updates every 30 seconds. • A small random number is added to prevent collisions. • Route timeout • A route timeout timer is associated with a route. When it expires, the route is marked invalid. • Route-flush timer • After the route timeout expires, the route-flush timer eventually expires, deleting the route from the table.

  7. Multiple Stability Features • Split Horizon • Information learned about a route is not sent back out the interface it was learned from. • Hold-down mechanisms • When a link in a route fails, that route is put in a hold-down state, where routers neither send or receive updates about that route.

  8. Rip Packet • A -- Command - request or response. • B -- Version # - specifies version of RIP. • C -- Zero - Not used. • D -- Address Family Identifier (AFI) - Indicates type of address being specified (IP, IPX, etc) • E -- Address - Specifies IP address of entry. • F -- Metric - # of hops traversed from source to destination

  9. Drawbacks • RIP version 1 does not recognize subnets. • This feature was added in RIP version 2. • Because RIP only uses hop count as a metric, packets may be forced to take a slower route with less hops over a faster route with more hops. • Other routing protocols use a combination of different metrics to calculate a route.

  10. FHSU Percussion Ensemble • Where: • Beach/Schmidt PAC • When: • Thursday 2-17-2000 • 8:00 PM • Cost: • Adults -- $6.00 • Senior Citizens & Students Over 12 -- $4.00 • FHSU Students -- Free w/ ID

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