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Understanding Routing Protocols.
(From Network Computing Asian Edition)
Byline: Dr Seamus Phan
If you are an Internet Service Provider (ISP), or a multinational organisation running large networks with your own bank of IP (Internet Protocol) addresses and provide multihomed addresses, take note. There may be a need to understand routing protocols so that you can communicate with equipment vendors and outsourced implementation consultants.
Two sides of the fence
There are simply two kinds of routing protocols?interior routing protocols, and exterior routing protocols.
One of the reasons why exterior routing protocols are important is in the issue of route failure prevention through multihoming. We have already seen the likes of natural disasters, corporate bankruptcies of ISPs, intentional or other man-made disasters, affecting the Internet connectivity of corporations. Short of creating too many redundant links, multihoming can work.
Interior routing protocols, such as the interior gateway routing protocol (IGRP), and the exterior routing protocols, such as the border gateway routing protocol (BGP), don?t necessarily communicate with each other, since they are rather different in nature. In order for communication to happen, network managers must set a way to redistribute IGRP autonomous system (AS) routes into the ISP?s BGP routes.
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