Lecture19

# Lecture19 - Lecture 19 Broadcast routing Eytan Modiano...

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Lecture 19 Broadcast routing Eytan Modiano Eytan Modiano Slide 1

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Broadcast Routing Route a packet from a source to all nodes in the network Possible solutions: Flooding: Each node sends packet on all outgoing links Discard packets received a second time Spanning Tree Routing: Send packet along a tree that includes all of the nodes in the network Eytan Modiano Slide 2
Graphs A graph G = (N,A) is a finite nonempty set of nodes and a set of node pairs A called arcs (or links or edges) 1 2 3 1 2 3 4 N = {1,2,3} N = {1,2,3,4} A = {(1,2),(2,3),(1,4),(2,4)} A = {(1,2)} Eytan Modiano Slide 3

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Walks and paths A walk is a sequence of nodes (n1, n2, . ..,nk) in which each adjacent node pair is an arc. A path is a walk with no repeated nodes. 1 2 4 3 1 2 4 3 Walk (1,2,3,4,2) Path (1,2,3,4) Eytan Modiano Slide 4
Cycles A cycle is a walk (n1, n2,. ..,nk) with n1 = nk, k>3, and with no repeated nodes except n1 = nk Cycle (1,2,4,3,1) 1 2 4 3 Eytan Modiano Slide 5

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Connected graph A graph is connected if a path exists between each pair of nodes. 1 2 4 3 1 2 3 Connected Unconnected An unconnected graph can be separated into two or more connected components. Eytan Modiano Slide 6
Acyclic graphs and trees An acyclic graph is a graph with no cycles. A tree is an acyclic connected graph. 1 2 4 3 1 2 3 1 2 3 Acyclic, unconnected Cyclic, connected not tree not tree The number of arcs in a tree is always one less than the number of nodes Proof: start with arbitrary node and each time you add an arc you add a node

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Lecture19 - Lecture 19 Broadcast routing Eytan Modiano...

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