• Customers connected to more than one service provider
• Service provider networks (transit autonomous systems)
• Service providers exchanging traffic at an exchange point (CIX, GIX, NAP, ...)
• Network cores of large-enterprise customers
The figure shows typical scenarios in which BGP is usable. These scenarios include the following:
■ Customers connected to more than one service provider.
■ ISP networks themselves acting as transit systems and forwarding external traffic.
■ Exchange points, which can be defined by the network access point (NAP) between region and core. International exchange points can be defined by either Commercial Internet eXchange (CIX) or Global Internet eXchange (GIX) points.
■ Very large enterprises using BGP as their core routing protocol.
© 2005, Cisco Systems, Inc. BGP Overview 1-11
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