Popular knowledge about CN2 lines: Global Transit (CN2 GT), Global Internet Access (CN2 GIA)

CN2 has two main product lines: Global Transit (GT) and Global Internet Access (GIA), hereinafter referred to as GT and GIA. GT has three types: global routing, pure mainland routing, and pure international routing. GIA has four types: global routing, pure mainland routing, pure China Telecom routing, and pure international routing

Global routing = receive routes from all over the world, send routes to all over the world Pure mainland routing = receiving routes from all operators in mainland China and sending routes to all operators in mainland China Pure international routing = receiving routes outside mainland China and sending routes to operators outside mainland China Pure China Telecom routing = The route is only sent to China Telecom and not to other operators in mainland China

Q&A: 1) Under what circumstances will a GIA route become a GT route? Routes are not sent to CN2, routes are not redistributed to Asia, and other special parameter control conditions. 2) Why do some IDC CN2s not use CN2 for specific operators/outbound/return routes even though they have purchased mainland routes? The following three situations are explained respectively. The outbound journey does not go: 1. It may be that IDC has set up the route not to be sent to a specific operator. 2. It may be that a specific operator refuses to accept routes (for example, China Unicom usually has this problem, and China Unicom usually does not cooperate with the solution all year round) No return trip: IDC decides what to do on the return trip. If you have any questions, you should ask IDC.

3) How to distinguish between GT and GIA? In more common situations, you can make a judgment based on the interconnection address between mainland operators CN2. However, this cannot be determined in special circumstances, such as the situation described in the first point, and the situation where the entire route is downgraded to a GT route through special parameters.

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