module09b-routers

module09b-routers - Router Architectures An overview of...

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Router Architectures An overview of router architectures.
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2 Introduction What is a Packet Switch? Basic Architectural Components Some Example Packet Switches The Evolution of IP Routers
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3 Router Components Hardware components of a router: Network interfaces Interconnection network Processor with a memory and CPU PC router: interconnection network is the (PCI) bus and interface cards are NICs All forwarding and routing is done on central processor Commercial routers: Interconnection network and interface cards are sophisticated Processor is only responsible for control functions (route processor) Almost all forwarding is done on interface cards Interface Card Interconnection Network Interface Card Interface Card Processor CPU Memory
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4 Functional Components Control Datapath: per-packet processing routing table Routing functions IP Forwarding routing table lookup routing table updates incoming IP datagrams outgoing IP datagrams routing protocol routing protocol
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5 Routing and Forwarding Routing functions include: route calculation maintenance of the routing table execution of routing protocols On commercial routers handled by a single general purpose
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This note was uploaded on 03/05/2012 for the course CS 458 taught by Professor Staff during the Fall '08 term at UVA.

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module09b-routers - Router Architectures An overview of...

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