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Discussion Notes 6

Discussion Notes 6 - EE132B Recitation 8 Routing on the...

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EE132B - Recitation 8 Routing on the Internet Prof. Izhak Rubin [email protected] Electrical Engineering Department UCLA
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Routing on the Internet Definition In its simplest terms, routing is choosing a path over which data packets will be sent. On the internet, this function is performed by layer 3 (IP) of the OSI model. Each router attaches to 2 or more physical networks and forwards IP datagrams among them. Except for destinations on directly attached networks, hosts pass all IP datagrams to routers which will forward them to their final destinations. Two main classes of routing algorithms: Distance Vector (Bellman-Ford) Link State Routing (Shortest Path First)
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Distance Vector When a router boots up, it initializes its routing table to contain an entry for each directly connected network. When a report arrives at router K from router J, K examines the set of destinations reported and the distance to each. If J knows a shorter way to a destination, or if J lists a destination that K does not have in its table, K replaces its table entry. The process of interchanging information between neighboring routers continues until convergence is reach.
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