Representation of AS
A simple example
aut-num: AS1
as-out: to AS2 announce AS1
as-in: from AS2 accept AS2 0r AS3
aut-num: AS2
as-out: to AS1 announce AS2 AS3
as-in: from AS1 accept AS1
as-out: to AS3 announce AS2 AS1
as-in: from AS3 accept AS3
aut-num: AS3
as-out: to AS2 announce AS3
as-in: from AS2 accept AS1 or AS2
AS 1
AS 2
AS 3
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