How many kinds of topologies does BGP have?

Latest reply: Mar 28, 2016 16:45:19 985 1 0 0

How many kinds of topologies does BGP have?

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Created Mar 28, 2016 16:45:19 Helpful(0) Helpful(0)

BGP has three basic network topologies.
Stub AS: An AS that reaches extraterritorial network through a single exit;
Multi-homed AS: An AS that has more than one exit to reach extraterritorial network, but it does not allow the traffic from other network to another network through itself.
Transit AS: An AS that has more than one exit to reach extraterritorial network, and it allows the traffic from other network to another network through itself.
From the view of BGP , the entire topology of the Internet is composed of a series of stub AS, Multi-homed non-transition AS and transit AS. BGP ensures the establishment of path tree by aggregating all paths that do not forms loop, which is the route to a certain destination.
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