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Cisco Routers for the Desperate, 2nd Edition by Michael W. Lucas

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Configuring BGP

The good news is that the paperwork necessary to prepare for BGP is the hard part. The actual setup process is very mechanical. When you configure BGP, your ISP should provide you with an IP address for their router's BGP session (usually, their end of the Internet circuit) and an ASN to peer with.

Your Address Announcements

By default, a BGP session refuses to announce routes to its peers. This helps prevent a small company's router from becoming an inter-backbone exchange point. (Your upstream providers should filter your announcements so that they only receive the proper routes from you, so this shouldn't be a problem.[7]) For a router to announce a block of addresses via BGP, it must know where to send packets bound for those ...

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