AS-Path

• Sequence of ASes a route has traversed

• Loop detection

AS 100

AS 300

AS 200

AS 500

AS 400

170.10.0.0/16

180.10.0.0/16

150.10.0.0/16

180.10.0.0/16 300 200 100

170.10.0.0/16 300 200

150.10.0.0/16 300 400

180.10.0.0/16

dropped

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