Transit and stub ASs

FIGURE 8 . 1 0 Transit and stub ASs
In this example, AS 200 would be a transit AS. The routes the AS learns from AS 300 will
transit AS 200 and be received by AS 100. The same is true for AS 100. The routes AS 200
learns from AS 100 will transit the AS and be passed on to AS 300. In other words, a transit
AS is an AS that allows information learned from another AS to transit through to another AS.