Layer3 Interconnections_routers_gateways

Layer3 Interconnections_routers_gateways - the network to...

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Routers and Gateways
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Network of Networks Net A Net D Net B Net C Net E
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Internet Architecture A network of networks…. Formally, a collection of arbitrarily connected Autonomous Systems (AS). AS is a set of routers managed under a single admin. Routing requirements: Within networks (autonomous systems) Interior Gateway Protocols Between networks Exterior Gateway Protocols
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Interior Network Routing Net D
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Interior Network Routing Net D Subnet 1 Subnet 2 Subnet 3 Subnet 4 Subnet 5 Subnet 6
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Subnet 1 134.193.2.15 134.193.2.20 134.193.2.25 134.193.2.30 134.193.2.1 134.193.19.2 134.193.18.9 134.193.17.5 Switch /hub router
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Inter-subnet routing Net D 134.193.17/24 134.193.18/24 134.193.19/24 134.193.20/24 134.193.21/24 134.193.23/24 134.193.22/24 134.193.24/24 134.193.26/24 134.193.25/24
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Routing within Networks How do you get from one machine within
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Unformatted text preview: the network to another? – What paths are available? – Which path is “best”? – What happens when network status changes? Exterior Network Routing Net A Net D Net B Net C Net E Routing Between Networks • What kinds of traffic move between networks? – Interior traffic (originates or terminates locally) – Transit traffic (just passes through) • What kinds of functions do the networks want to support? • How are routes to other networks identified? • How are alternative routes selected? Gateways • Used to control the flow of packets from one network to another Exterior Gateway Protocol (EGP) • Control Routing of packets • Control Security of data flow – filter data based on network rules...
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This note was uploaded on 10/28/2009 for the course CSE 598 taught by Professor Huang during the Fall '09 term at University of Arizona- Tucson.

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Layer3 Interconnections_routers_gateways - the network to...

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