Part II: Inter-domain Routing Policies. traffic. traffic. What is routing policy?. ISP2. ISP1. Connectivity DOES NOT imply reachability!. ISP3. ISP4. Cust1. Cust2. Policy determines how traffic can flow on the Internet. BGP routing process. Apply input policy. Apply output policy.
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BGP is not shortest path routing!
[1 2 3], [1 2 6 3] are valley-free
[1 4 3], [1 4 5 3] are not valley free