In the first main alternative, the top level structure of the global
network consists of arbitrarily connected network domains, much
like the Internet’s Autonomous System (AS) structure. The difference
is that the network domains can use different internal addressing
schemes. The top-level routing problem is thus similar to
the one that BGP solves in the Internet, but with the difference
that address prefixes are not used, just the equivalence of AS
numbers and paths. Finally, the name resolution system needs to
consult top-level routing information to be able to resolve names
into addresses.