what is bgp

The full English name of bgp is "Border Gateway Protocol", which refers to the border gateway protocol. It is a routing protocol used to connect independent systems on the Internet. It is an enhanced and complete protocol developed by the Internet Engineering Task Force. , scalable protocols.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

What is bgp?

BGP (Border Gateway Protocol) is a routing protocol used to connect independent systems on the Internet. It is an enhanced, complete, and scalable protocol developed by the Internet Engineering Task Force. BGP4 supports the CIDR addressing scheme, which increases the number of IP addresses available on the Internet. BGP was designed to replace the original Exterior Gateway Protocol EGP. It is also considered a path vector protocol.

BGP is mainly used for interconnection between Internet AS (autonomous systems). The main function of BGP is to control the propagation of routes and select the best route. China Unicom, China Telecom, China Railwaycom and some large private IDC operators all have AS numbers. Most of the major network operators in the country achieve multi-line interconnection through the BGP protocol and their own AS numbers. To use this solution to achieve multi-line interconnection, IDC needs to apply for its own IP address segment and AS number from CNNIC (China Internet Information Center) or APNIC (Asia Pacific Network Information Center), and then broadcast this IP address segment to other devices through the BGP protocol. in the network operator's network. After interconnection using the BGP protocol, all backbone routing equipment of the network operator will determine the best route to the IP segment of the IDC computer room to ensure high-speed access for users of different network operators.

The computer room that uses the BGP solution to realize dual-line interconnection or multi-line interconnection is called a BGP computer room.

Advantages

1. The server only needs to set an IP address. The best access route is determined by the backbone router on the network based on the routing hop count and other technical indicators. , and will not occupy any system resources of the server. Both the upstream and downstream routes of the server can choose the optimal path, so it can truly achieve high-speed single-IP high-speed access.

2. Since the BGP protocol itself has the characteristics of redundant backup and loop elimination, when the IDC service provider has multiple BGP interconnection lines, mutual backup of routes can be achieved. When one line fails, the routing will Automatically switch to other lines.

3. The use of BGP protocol can also make the network highly scalable. The IDC network can be interconnected with other operators, and single IP multiple lines can be easily realized, so that users of all interconnected operators can access quickly. . This is unmatched by dual IP and dual lines.

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