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Broadcast Routing
deliver packets from source to all other nodes
source duplication is inefficient:
source duplication: how does source determine recipient addresses?
In-network duplication
flooding: when node receives brdcst pckt, sends copy to all neighbors
Problems: cycles broadcast storm
controlled flooding: node only brdcsts pkt if it hasn’t brdcst same packet before
Node keeps track of pckt ids already brdcsted
Or reverse path forwarding (RPF): only forward pckt if it arrived on shortest path between node and source
spanning tree
No redundant packets received by any node
Spanning Tree
First construct a spanning tree
Nodes forward copies only along spanning tree
Spanning Tree: Creation
Center node
Each node sends unicast join message to center node
Message forwarded until it arrives at a node already belonging to spanning tree
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Stepwise construction of spanning tree
(b) Constructed spanning tree
Summary
Broadcast Routing
Spanning Tree
本人专注于k12教育,英语四级考试培训,本人是大学本科计算机专业毕业生,专注软件工程计算机专业,也可承接计算机专业的C语言程序设计,Java开发,Python程序开发。
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