In the original definition and obsolete definition of the
Border Gateway Protocol, Version 1, it was assumed that "A consistent view of the interior routes of the autonomous system is provided by the intra-AS routing protocol." It has become common, however, for an autonomous system to contain several instances of sets of routers and subnets, under one or more interior routing protocol, and with different metric assumptions. These instances are known as routing domains . This definition in RFC 1237, in turn, comes from the ISO Routeing [sic] Framework, not available online.
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