CS551: ISP Peering Norton01 Christos Papadopoulos (http://netweb.usc.edu/cs551/)http://netweb.usc.edu/cs551/)

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Presentation transcript:

CS551: ISP Peering Norton01 Christos Papadopoulos (

Definitions Peering: –Provide connectivity to each others’ customers –Non-transitive relationship Transit: –One ISP sells transit to another ISP Tier-1 ISP: –Has access to global routing table –Does not purchase transit from anyone

Why Peer? Reduced cost –Buying transit is expensive Reduced latency –Reduced number of hops

Why Not Peer? Traffic asymmetry Potential transit sale Peering consumes resources –Staff, router cards, etc Maintain exclusivity –Peering makes both ISPs stronger Peering relations have less contractual teeth

Decision Phases Phase 1: Identify peer Phase 2: Contact potential peer Phase 3: Agree on peering methodology

Phase 1: Identify Peer Traffic engineering, data collection and analysis Technical, business and legal issues Intuition Broader business arrangements (CEO’s play golf together) Peering policies (open, exclusive)

Phase 2: Contact Peer Find the right person! Sign NDA (optional) Share traffic stats

Phase 3: Peering Methodology Direct v.s. exchange-based Cost sharing –Split equally –I will peer with you if you pay all the cost