说人话就是:对等互联( Peering )指的是到对方网络,对方没有帮你当跳板把流量转发到异网的义务但不对等互联( IP Transit )才是提供这个服务的。所以Transit收费但Peering不收费。前几天工信部那个文件就是帮移动省点流量费,但是需要搞清楚,这样只是帮助移动访问电联的网络费用不收,但是电联没有义务帮移动转发流量到异网,所以不要以为移动出国线路会变好。
Tier-1 ISP 定义:
- A Regional Tier 1 ISP is an ISP that has access to the entire Internet Region solely via its free and reciprocal peering agreements, and it doesn't paytransit fees to anyone to reach any destination in the Internet Region。
2. Tier-2 ISP 定义:
- Tier-2 ISP 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.A tier-2 ISP is a customer of one or more tier-1 ISP.
Tier-2 ISP 可以建立自己的网络以便和其它网络互连并构成Internet的一部分,但是它们还必须向Tier-1 ISP 付费以便访问互联网的其它一些区域。