Analysis of a new generation of data center: dual-line computer room

The Internet Data Center (IDC) has become a central nerve for business operations. High-quality new technology data centers and IDC services will directly promote the efficiency and sustainability of next-generation data centers. Statistics show that the domestic IDC industry market will grow at a compound growth rate of 25% in the next three years, and the market size will reach 8 billion yuan by 2011.

IDC faces multiple challenges

With the growing demand for IDCs, the next-generation carrier-grade data centers are facing new challenges. Macroscopically, it includes problems such as computer room settings and network optimization, construction standards, and neglect of internal improvements. In addition, telecom operators also have problems in that service capabilities are far from service outsourcing requirements, and lack energy-saving measures and design standards. At a micro level, enterprises choose data centers in addition to hoping to obtain rich IP and bandwidth resources, and also pay more attention to various security measures of host service providers and the speed of response after problems.

At present, the congestion of network interconnection leads to the problem of interconnection and interconnection of domestic networks, which restricts the further development of China's Internet. The traditional network model has been unable to cope with the challenges. The IDC dual-line computer room, the next-generation Internet data center for the problem of congestion of web sites and networks, came into being.

IDC dual line implementation method

IDC dual-line technology is to connect different network access provider (ISP) services to a server or server cluster through special technical means, so that the network services provided by the server can be accessed by users with the same ISP as possible Or the ISP connection with faster mutual visit speed is used to visit, so as to solve or alleviate the problem of slow delay (network bottleneck of north and south network) for cross-ISP users to visit the website.

IDC dual line is a technical concept with multiple implementations. Currently, domestic IDC providers have proposed the following four dual line implementation methods.

1. Dual IP dual line solution

In this solution, two network cards need to be installed on a server, which are respectively connected to the telecommunications network cable and Unicom network cable and set up a Unicom IP and a telecommunications IP. In this way, there are two IP addresses on one server. Add the routing table of the telecom operator to realize that Unicom users and telecom users can access from different lines respectively.

The dual IP dual line improves the user's speed of accessing the website to a certain extent, but because the dual network card accessed by the server must set the routing table on the server, it increases the difficulty of maintenance for ordinary users, and all data packets need to be on the server After the route is judged on the Internet, it is sent to different network cards. When the amount of access is large, the server resources take up a lot. This solution is the simplest two-wire solution and is generally adopted by smaller IDC providers.

2. Single IP dual line solution

Ordinary single-IP dual-line refers to setting an IP on the server, this IP is Unicom IP or telecommunications IP, through the routing device to set up data packets sent to the network of the other operator and realize the two-wire technology. This solution can improve the user's access speed and solve the problem of dual IP and dual line routing needs to be set on the server, but because the IP address uses Unicom or Telecom's IP, access users will not automatically determine the most when sending request packets Good routing.

This half-dual line technical solution is a transitional solution. This plan is generally a temporary plan adopted during the transition period from a single-line IDC service provider to a dual-line IDC service provider.

3.CDN realizes dual line solution

CDN (Content Delivery Network) Internet content distribution network, multi-server subnet hosting plus intelligent domain name DNS, that is, the server is provided by the CDN service provider, placed on different network nodes, through the buffer program to automatically grab the user source server data, and then cache On servers of different network segment nodes. Cooperating with the subnet analysis function of the intelligent DNS server, this solution enables different network users to access the website on the nearest network segment to avoid affecting the website access speed due to network problems.

At present, most of the CDN technology is relatively mature in the processing of static websites, but the processing method for websites with strong interactivity such as full dynamic pages is not very mature. This solution is mainly used as an auxiliary solution, and it needs to cooperate with other two-wire solutions to achieve the best results.

4. Use BGP protocol to achieve single IP dual line solution

BGP (Border Gateway Protocol) is a routing protocol used to connect independent systems on the Internet. It is a strengthened, perfect and scalable agreement formulated 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 to be a path vector protocol.

The BGP protocol is mainly used for interconnection between Internet ASs (autonomous systems), and its main function is to control the propagation of routes and select the best route. Both China Unicom and China Telecom have AS numbers (autonomous system numbers). Most major network operators in the country interconnect with their own AS numbers through the BGP protocol. To use this solution to achieve dual lines, you need to apply for IDC's own IP address segment and AS number at CNNIC (China Internet Information Center), and then broadcast this IP address to other telecommunications operators such as China Unicom and China Telecom through BGP. After interconnection using the BGP protocol, all backbone routing equipment of the telecom operator will determine the best route to the IP segment of the IDC computer room to ensure high-speed access for users.

Using this scheme has the following advantages:

The server only needs to set an IP address. The optimal access route is determined by the backbone router on the network according to the number of route hops and other technical indicators, and will not occupy any system resources of the server. Both the upstream route and the downstream route of the server can select the optimal path, which can truly achieve high-speed single IP and two-line access.

Because the BGP protocol has the characteristics of redundant backup and elimination of loops, when the IDC service provider has multiple BGP interconnected lines, it can realize mutual backup of routes. When a line fails, the route will automatically switch to other lines.

The BGP protocol can also make the network highly extensible. It can interconnect the IDC network with other operators, easily implement single IP multi-line, and enable users of all interconnected operators to access quickly. This is unmatched by dual IP dual lines.

Although the BGP solution is the best solution, this solution requires the IDC service provider to invest more in equipment and bandwidth, and is technically more complicated. Therefore, the current domestic adoption of this solution is limited to the provision of strong professional IDC services. Quotient. IDC dual-line computer room will be the main direction in the future.

IDC dual-line computer room will be the main direction in the future

The main function of BGP single IP dual line is to control the propagation of routes and select the best route to ensure the high-speed access of users of China Unicom and China Telecom. It is the best way to solve network interconnection and improve network access speed. At present, the domestic BGP two-wire solution comes from a strong professional IDC service provider. The main domestic BGP two-wire computer rooms are Audun Xi'an Data Center, Beijing Dongsi Data Center, Beijing Zhaowei Data Center, Beijing Gongti Double Line Data center, Shanghai Mobile Nujiang dual-line data center, etc.

In the future, the Internet will develop in an orderly manner with high stability and high speed. The next-generation Internet data center will also comply with the needs of enterprises for server access speed and network security, and more tend to adopt IDC dual-line technology. IDC dual-line technology The computer room will be the main development direction of the Internet data center in the future.

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