What is BGP line or BGP room

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

BGP is mainly used for interconnection between Internet ASs (autonomous systems). The main function of BGP is to control the propagation of routes and select the best route. China Netcom, China Telecom, China Railcom and some large private IDC operators all have AS numbers. Most of the major network operators in the country use the BGP protocol to achieve multi-line interconnection with their own AS number. To use this solution to achieve multi-line interconnection, IDC needs to be in CNNIC (China Internet Information Center) or APNIC (Asia-Pacific Network Information Center) and AS number (currently Runxun, Century Internet, NetScience), and then use BGP to The segment IP address is broadcast to the network of other network operators. After the BGP protocol is interconnected, all the backbone routers of the network operator will determine the optimal route of the IP segment of the IDC room to ensure high-speed access for users of different network operators.

The BGP solution is used to implement dual-line interconnection or multi-line interconnection. We call it the BGP room. Advantages of BGP room

1. The server only needs to set an IP address. The best access route is determined by the backbone router on the network and the BGP server room. According to the route hop count and other technical indicators, Does not consume any system resources of the server. Both the upstream route and the downstream route of the server can select the optimal path, so that high-speed single-IP high-speed access can be realized.

2, because the BGP protocol itself has the characteristics of redundant backup and elimination of loops, when the IDC service provider has multiple BGP interconnection lines, it can realize mutual backup of routes. When a line fails, the route will be routed. Automatically switch to other lines.

3, using BGP protocol can also make the network have strong scalability. It can interconnect the IDC network with other operators, and easily realize single-IP multi-line, so that all users of the interconnection operators can access quickly. . This is unmatched by the dual IP dual line.

BGP Room Line Technology

BGP is a routing protocol between autonomous systems. Its main function is to exchange network reachability information with other BGP speakers. A BGP speaker is any device configured for BGP. BGP uses TCP as its transport protocol (port 179), which provides reliable data transfer.

Two BGP routers form a connection to a transport protocol. These two routers are called neighbors or peers. Once the transport connection is formed, the two pairs of routers exchange messages to open and confirm the connection parameters. In this step, the router exchanges information such as the BGP version number, AS number, duration, BGP ID, and other optional parameters. If any of the parameters between the peers are inconsistent, an error notification will be sent and the peer connection will not be established.

If the peer router agrees to these parameters, the entire BGP routing table is exchanged through UPDATE messages. The UPDATE message contains a list of reachable destinations through each system (ie, network layer reachability information NLRI) and the path attributes of each route. The path attribute contains information such as the routing source (ORIGIN) and the priority of the priority.

The BGP table is valid for each peer during the BGP connection. If there is a change in the routing message, the neighbor router uses an incremental update (message) to pass this information. BGP does not require refresh routing information. If no route change occurs, the BGP peer exchanges only keepalive messages, and keepalive messages are sent periodically to ensure that the connection remains valid.