BGP (Border Gateway Protocol) is an Internet routing protocol used to exchange routing information between different autonomous systems. A BGP line refers to a network line that uses the BGP protocol for route exchange. BGP lines are usually provided by multiple ISPs (Internet Service Providers, Internet Service Providers), and cross-ISP interconnection can be realized through these lines. BGP line has the characteristics of high reliability, high bandwidth, and low delay. It is one of the main network access methods used by organizations such as enterprises and government agencies that have high requirements for network connectivity.

The advantages of BGP lines are as follows:

1. It can integrate the networks of multiple operators such as China Telecom, China Unicom, and China Mobile to realize multi-line interconnection and improve network stability and reliability.

2. Multiple lines can be integrated into the same IP access without affecting the use, which is conducive to unifying user access addresses.

3. It can automatically switch to other lines after a problem occurs in one line to ensure normal access for users.

4. It can automatically identify whether the visiting user is China Telecom or China Unicom Mobile. When a telecom user visits, it will automatically switch to the telecom line, reducing delay and improving user access speed. When the telecommunications line fails, it can automatically switch to the mobile line or China Unicom line with low delay.