Introduction to IP Routing
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This article is presented by:
Geoff Huston
Introduction to IP Routing


Routing

How do packets get from A to B in the Internet?


Connectionless Forwarding


Each router (switch) makes a LOCAL decision to forward the packet towards B
Connectionless Forwarding
Each router (switch) makes a LOCAL decision to forward the packet towards B

This is termed destination-based connectionless forwarding
How does each router know the correct local forwarding decision for any possible destination address?
Through knowledge of the topology state of the network
This knowledge is maintained by a routing protocol
Routing Protocols
Distribute the knowledge of the current topology state of the network to all routers
This knowledge is used by each router to generate a forwarding table, which contains the local switching decision for each known destination address

For more information about this article,please follow the link:
http://googleurl?sa=t&source=web&cd=1&ve...trorte.ppt&ei=Kg-wTI7KKJPSuwOA0MTwBg&usg=AFQjCNEaK3zilGML3eOkgeK5TyczwyeOXg


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