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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Протокол пограничных шлюзов — Википедия