Tier 2 network
From Wikipedia, the free encyclopedia
A Tier 2 Network is an Internet service provider who engages in the practice of peering with other networks, but who still purchases IP transit to reach some portion of the Internet.
Tier 2 providers are the most common providers on the Internet as it is much easier to purchase transit from a Tier 1 network than it is to peer with them and then attempt to push into becoming a Tier 1 carrier.
The term Tier 3 is sometimes also used to describe networks who solely purchase IP transit from other networks (typically Tier 2 networks) to reach the Internet. The majority of Tier 3 networks are usually single rather than multi-homed and therefore are vulnerable to depeering disputes.
[edit] See also
[edit] List of large or important tier 2 IPv4 ISPs
- PCCW Global (formerly Beyond the Network Access (BTN)) AS3491 (Buys transit from Global Crossing AS3549)
- Cogent Communications AS174 (buys transit from NTT, AS2914)
- Entanet/AS8468 (Teleglobe/TeliaSonera)
- France Télécom AS5511 (buys transit from Sprint, AS1239)
- Tiscali International AS3257 (buys transit from Sprint, AS1239)
- Tele2 (formerly SWIPNet) AS1257 (buys transit from Sprint, AS1239)
- Telecom Italia Sparkle (Seabone) AS6762 (buys transit from Sprint, AS1239)
- nLayer AS4436 (buys transit from GBLX/AS3549)
- Interoute AS8928 (buys tansit from Sprint/AS1239 and Tiscali/AS3257)
- Limelight Networks
- TeliaSonera AS1299 (AS701 paid transit)
The ASxxx refer to each network's IANA-assigned AS number.
