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Internet Routing Protocol

Surasak Sanguanpong nguan@ku.ac.th

http://www.cpe.ku.ac.th/~nguan/

Last update: July 30, 1999

(2)

Agenda

! Basic concepts

! Routing components

! Classes of routing protocol

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Internet Routing Architecture

Autonomous System

Autonomous System IGP

IGP

IGP BGP4

BGP4 BGP4

IGP

IGP

IGP IGP

IGP IGP

EGP/BGP EGP/BGP EGP/BGP

EGP/BGP

EGP/BGP

EGP/BGP

Autonomous

System Autonomous

System

(4)

Autonomous System

! AS is a collectionof LANs and WANs and the

interconnectting routers which under the control of one management authority

! The same AS runs the same Interior Gateway Protocol

! Why setting up AS? - establish a direct link to each other rather than route through the core Internet

! How to select AS? - register and get the AS

number from NIC

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Gateway Protocol

! Interior gateway protocol

! exchange routing information between routers within a single AS

! RIP, RIP II, OSPF

! Exterior gateway protocol

! collect network-reachablity information for the AS

! EGP, BGP

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Routed and Routing Protocol

! “tell neighbors about the my world”

! “distance” means routing metric measured by hop count

! “vector” means destination

! flood routing table only to its neighbors

! RIP is an example

! also knowns as Bellmann-Ford algorithm or

Ford-Fulkerson algorithm

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