Representation of AS
aut-num: AS4
as-in: from AS123 100 accept ANY
as-in: from AS6 99 accept AS6
as-out: to AS123 announce AS4
as-out: to AS6 announce AS4
aut-num: AS123
as-in: from AS4 100 accept AS4
as-in: from AS6 100 accept AS6
as-out: to AS4 announce ANY
as-out: to AS6 announce ANY
aut-num: AS6
as-in: from AS123 20 accept ANY
as-in: from AS4 10 accept AS4
as-out: to AS123 announce AS6
as-out: to AS4 announce AS6
AS 123
AS 4
AS 6
Possibility 1
Costs are
relative per AS
The cost is used here to show routing policy
The lower the cost value the more preferred the route is
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