Large customer or small ISP connecting to the Internet
The figure shows a customer network connected to the Internet using a single ISP, but such a scenario is generally not the case when BGP is used. Normal Internet access to a single ISP does not require BGP; static routes are more commonly used to handle this situation. Small ISPs buying Internet connectivity from other ISPs use this type of connectivity more often, especially if they want to start their business the proper way—by using their own AS number and having their own address space.
1-12 Configuring BGP on Cisco Routers (BGP) v3.2 © 2005, Cisco Systems, Inc.
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