Border Gateway Protocol
- BGP is a routing protocol used by autonomous systems (ASes) to exchange routing information.
- It is the most scalable of all routing protocols.
- BGP uses a hierarchical routing model with a local routing table and a global routing table.
- The main BGP process decides if any of the neighbor’s new routes are preferred to routes already in the Loc-RIB.
- Communities are attribute tags that can be applied to incoming or outgoing prefixes to achieve common goals.
- BGP Extended Community Attribute was added in 2006 to extend the range of such attributes and provide a community attribute structuring.
- Route reflectors (RRs) reduce the number of connections required in an AS, providing added iBGP scalability.
- RRs are a pure performance-enhancing technique, while confederations can also be used to implement more fine-grained policy.
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