Summary
BGP is a very sophisticated and highly scalable protocol that has been used in its current version for Internet core routing since 1993. Requirements of the Internet core have led to a very stable and feature-rich implementation. BGP comes in two flavors: EBGP, for routing between autonomous systems (interdomain routing); and IBGP, for routing within autonomous systems (intradomain routing).
Unlike the majority of IGPs, BGP topologies are usually manually configured. Moreover, because BGP is normally used to implement the network operator's routing policy, configurations can be relatively complex. Policies are most often based on a number of attributes that BGP associates with network routes. These attributes may be localized to a single ...
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