The Update-Send process is responsible for advertising UPDATE messages to all peers. For example, it distributes the routes chosen by the Decision Process to other BGP speakers which may be located in either the same autonomous system or a neighboring autonomous system. rules for information exchange between BGP speakers located in different autonomous systems are given in 9.2.2; rules for information exchange between BGP speakers located in the same autonomous system are given in 9.2.1.
Distribution of routing information between a set of BGP speakers, all of which are located in the same autonomous system, is referred to as internal distribution.