BGP POLICY-BASED ARCHITECTURE
As stated earlier, one of the unique aspects of BGP is its policy-based architecture. RFC 1655 describes this architecture, and this part of the chapter provides a summary of RFC 1655's description of this aspect of BGP.
BGP provides the capability for enforcing policies based on various routing preferences and constraints, such as economic, security, or political considerations. Policies are not directly encoded in the protocol. Rather, policies are provided to BGP in the form of configuration information, explained in the last section of this chapter.
The BGP routers are capable of allowing the network manager (the AS administration) to perform “policy configuration” tasks when a policy is created or changed. These ...
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