Internet Routing Protocol Surasak Sanguanpong nguan@ku.ac.th - - PDF document

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1-1 Internet Routing Protocol Surasak Sanguanpong nguan@ku.ac.th http://www.cpe.ku.ac.th/~nguan/ Last update: July 30, 1999 http://www.cpe.ku.ac.th/~nguan Applied Network Research Group, Department of Computer Engineering, Kasetsart

SLIDE 1

1-1 http://www.cpe.ku.ac.th/~nguan  Applied Network Research Group, Department of Computer Engineering, Kasetsart University

Internet Routing Protocol

Surasak Sanguanpong nguan@ku.ac.th http://www.cpe.ku.ac.th/~nguan/ Last update: July 30, 1999

1-2 http://www.cpe.ku.ac.th/~nguan  Applied Network Research Group, Department of Computer Engineering, Kasetsart University

Agenda

Basic concepts Routing components Classes of routing protocol

SLIDE 2

1-3 http://www.cpe.ku.ac.th/~nguan  Applied Network Research Group, Department of Computer Engineering, Kasetsart University

Internet Routing Architecture

Autonomous System 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

1-4 http://www.cpe.ku.ac.th/~nguan  Applied Network Research Group, Department of Computer Engineering, Kasetsart University

Autonomous System

AS is a collection of LANs and WANs and the

interconnecting routers which under the control

f 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

SLIDE 3

1-5 http://www.cpe.ku.ac.th/~nguan  Applied Network Research Group, Department of Computer Engineering, Kasetsart University

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

1-6 http://www.cpe.ku.ac.th/~nguan  Applied Network Research Group, Department of Computer Engineering, Kasetsart University

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