![]() All other networks in the Internet are connected, directly or indirectly, to one or another of the Tier 1s, so when the Tier 1s peer with one another they gain settlement-free access to every network on the Internet.īelow Tier 1s are the Tier 2 ISPs that are typically regional providers or national ISPs that haven’t joined the Tier 1 club. A Vale of TiersĪs noted above, the largest networks in the Internet (which is a network of networks) are the so-called Tier 1 service providers. This post will show you how Kentik Detect can help you keep those transit costs to a minimum. Needless to say, the less paid for these “IP transit services,” the better. Instead you’ll be paying with actual money for at least for part of your access to the Internet. But if you’re an ISP without national or international scope, the big boys won’t let you into their select peering club. ![]() Known in the trade as “settlement-free peering,” the deal is simple: you transport my traffic and I’ll transport yours. For the biggest of the big - the “Tier 1” service providers like AT&T, Verizon, NTT, TeliaSonera, and China Telecom - payment is effectively based on barter. Getting traffic from place to place has a cost, and one way or another, someone has to pay. Whoever said “there’s no such thing as a free lunch” might just as well have been speaking about the Internet. How BGP-enabled Visibility Cuts Transit Costs
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