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v
The
job of the internet routing protocols is to determine the path taken by a datagram
between source and destination.
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The
Global Internet consists of Autonomous Systems (AS) interconnected with each other.
An Autonomous system (AS) is loosely defined as a set of routers or networks
that are administered by a single organization.
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There
is no restriction that an AS should run a single routing protocol within the
AS. There are three categories of Autonomous system (AS’s)
v Stub
AS: small
corporation: one connection to other AS’s
v
Multihomed
AS: large
corporation (no transit): multiple connections to other AS’s, it carries only
local traffic and does not support transit traffic.
v Transit AS: provider, it has multiple connections to the
outside world and can carry transit and local traffic.
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