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Nov01 - CSE/ECE404 Computer Networks Instructor Dr Liang...

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CSE/ECE404: Computer Networks Instructor: Dr. Liang Cheng Department of Computer Science and Engineering P.C. Rossin College of Engineering & Applied Science Lehigh University November 1, 2007
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Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/01/07 Outline Recap Exterior gateway protocols End-to-end protocol Summary and homework
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Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/01/07 Distance Vector vs. Link State DV: share everything it knows with directly connected neighbors; susceptible to loops RIP (Routing Information Protocol) LS: announce info only about directly connected link, but share with all routers in the domain or area; less susceptible to loops; faster converge time OSPF (Open Shortest Path First) protocol IGP: Interior Gateway Protocols
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Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/01/07 Internet Structure Today Backbone service provider Peering point Peering point Large corporation Large corporation Small corporation Consumer” ISP “Consumer ”ISP Consumer ” ISP AS (Autonomous System) Corresponds to an administrative domain Stub AS, multi-homed AS, and transit AS
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Instructor: Dr. Liang Cheng CSE/ECE404: Computer Networks 11/01/07 EGP: Exterior Gateway Protocol Overview Concerned with reachability , not optimal routes Protocol messages Neighbor acquisition: one router requests that another be its peer; peers exchange reachability information Neighbor reachability: one router periodically tests if the another is still reachable; exchange HELLO/ACK messages Routing updates: peers periodically exchange their routing tables
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Instructor: Dr. Liang Cheng
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