The next four generations of IDC's transition to a two-line machine room

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

IDC faces multiple challenges

As enterprises become more and more demanding for IDC, next-generation carrier-grade data centers are facing new challenges. Macroscopically, it includes problems such as computer room setting and network optimization, construction standards, and neglect of internal improvement. In addition, telecom operators still have problems such as large gaps in service capability from service outsourcing, lack of energy-saving means and design standards. Microscopically, in addition to hoping to obtain rich IP and bandwidth resources, enterprises choose data centers to pay more attention to the various security measures of host service providers and the response speed after problems occur.

At present, the congestion of network intercommunication leads to the problem of interconnection and intercommunication of domestic networks, which restricts the further development of China's Internet. The traditional network model has been unable to meet the challenges of the network, in order to meet the problems of rapid access speed of the network. Demand, the next-generation Internet data center that solves the problem of network congestion between most small and medium-sized websites - IDC two-line computer room 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. To enable the network service access users provided by the server to access the ISP connection with the same ISP or faster intercommunication as much as possible, thereby solving or alleviating the slow delay (North-South network bottleneck) problem of accessing the website across ISP users.

IDC dual line is a technical concept with multiple implementation methods. At present, domestic IDC providers propose the following four dual line implementation methods.

1. Dual IP Dual Line Solution

This solution requires two network cards to be installed on one server, respectively connected to the telecommunication network cable and the Unicom network cable and set up a Unicom IP and a telecom IP, so that there is a server. Two IP addresses are required. At this time, the routing table of the telecom operator needs to be added to the server to realize that the Unicom user and the telecommunications user respectively access from different lines.

Double IP dual line improves the speed of users accessing the website to a certain extent, but since the dual network card accessed by the server must be set on the server, the maintenance difficulty is increased for ordinary users, and all The data packets need to be routed on the server and then sent to different network cards. When the traffic is large, the server resources are occupied. This solution is the simplest two-wire solution and is generally adopted by smaller IDC providers.

2. Single IP Dual Line Solution

A normal single IP dual line refers to setting an IP on the server. This IP is Unicom IP or Telecom IP. It is sent to the network of the other carrier through the routing device setting data packet. Achieve two-wire technology. This solution can improve the user's access speed and solve the problem that the dual IP dual line needs to set the route on the server. However, since the IP address is the IP of China Unicom or Telecom, the access user does not automatically determine the most when sending the request packet. Good route.

The semi-double line technical solution belongs to the transitional form solution. This solution is generally a temporary solution adopted by a single-line IDC service provider to a two-line IDC service provider.

3. CDN implements dual-line solution

CDN (Content Delivery Network) Internet content distribution network, multi-server network hosting and smart domain name DNS, that is, the server is provided by CDN service provider, placed on different network nodes, buffered The program automatically captures the data of the user source server and then caches it on the servers of different network segment nodes. With the network resolution function of the intelligent DNS server, the solution enables different network users to access the website on the network segment closest to themselves, so as to avoid the impact of the network on the website.

At present, most CDN technologies are mature on the processing of static websites, but the handling of strong dynamic web pages is not very mature. This solution is mainly used as an auxiliary solution, and it needs to cooperate with other two-line solutions to achieve the best results.

4. Single-IP Dual-Line Solution with BGP Protocol

BGP (Border Gateway Protocol) is a routing protocol used to connect to independent systems on the Internet. It is an enhanced, comprehensive, 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, which is also considered a path vector protocol.

The BGP protocol is mainly used for interconnection between Internet ASs (autonomous systems). Its main function is to control the propagation of routes and select the best route. China Unicom and China Telecom both have the AS number (autonomous system number), and most of the major network operators in the country are interconnected with their own AS number through the BGP protocol. To use this scheme to implement dual-line, apply for IDC's own IP address segment and AS number at CNNIC (China Internet Information Center), and then broadcast this IP address to China Unicom, China Telecom and other telecom operators through BGP. After the BGP protocol is interconnected, all the backbone routing devices of the service provider will determine the best route for the IP segment of the IDC room to ensure high-speed access.

The use of this program has the following advantages.

(1) The server only needs to set an IP address. The optimal access route is determined by the backbone routers on the network according to the number of route hops and other technical indicators, and does not occupy any system resources of the server. Both the upstream and downstream routes of the server can select the optimal path, which can realize high-speed single-IP dual-line access.

(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 and route when a line fails. Will automatically switch to other lines.

(3) BGP protocol can also make the network highly scalable. It can interconnect the IDC network with other operators, and easily realize single-IP multi-line, so that all users of all interconnected operators can access it. fast. This is unmatched by the dual IP dual line.

Although the BGP solution is the best solution, this solution requires IDC service providers to invest heavily in equipment and bandwidth, and the technology is more complicated. Therefore, the current domestic adoption of this solution is limited to the strength. Strong professional IDC service provider. The IDC two-line machine room will be the main direction of the future.

IDC two-line computer room will be the main direction of 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 users of China Unicom and China Telecom. High-speed access is the best way to solve network interoperability and improve network access speed. At present, the BGP dual-line solution adopted in China comes from a strong professional IDC service provider. The main domestic BGP dual-line computer room includes Beijing Dongsi Data Center, Beijing Zhaowei Data Center, Beijing Workers' Two-Wire Data Center, and Shanghai Mobile Nujiang. Two-line data center, proud shield Xi'an 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 demand for server access speed and network security, and will tend to adopt IDC dual. Line technology, IDC two-line computer room will be the main direction of future Internet data center development.