(第1空)The Border Gateway Protocol (BGP) is an interautonomous system ( ) protocol. The primary function of a BGP speaking system is to exchange network ( ) information with other BGP system. This network reachability information includes information on the list of Autonomous System (ASs) that reachability information traverses. BGP-4 provides a new set of mechanisms for supporting ( ) interdomain routing. These mechanisms include support for advertising an IP ( ) and eliminate the concept of network class within BGP. BGP-4 also introduces mechanisms that allow aggregation of routes, including ( ) of AS paths. These changes provide support for the proposed supernetting scheme.