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Lecture 13: Distance-vector Routing

Lecture 13: Distance-vector Routing ". CSE 123: Computer Networks Alex C. Snoeren HW 3 due now! Lecture 13 Overview". distance vector Assume each router knows its own address and cost to reach each of its directly connected neighbors Bellman-Ford algorithm Distributed route computation using only neighbor's info Mitigating loops Split horizon and posion reverse CSE 123 Lecture 13: Distance-vector Routing 2. Bellman-Ford Algorithm". Define distances at each node X. dx(y) = cost of least-cost path from X to Y. Update distances based on neighbors dx(y) = min {c(x,v) + dv(y)} over all neighbors V. v! 2 y! 3 1. 1. u! x! 4 z! 2 1. 5 t! du(z) = min{c(u,v) + dv(z), w! 4 3 c(u,w) + dw(z)}. s! CSE 123 Lecture 13: Distance-vector Routing 3. distance vector Algorithm". Iterative, asynchronous: each Each node: local iteration caused by: Local link cost change wait for (change in local link distance vector update message cost or message from neighbor).

Distance vector Assume each router knows its own address and cost to reach each of its directly connected neighbors Bellman-Ford algorithm Distributed route computation using only neighbor’s info Mitigating loops Split horizon and posion reverse CSE …

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