Internet data center (IDC) for short. That is to say, the telecommunications department uses the existing Internet communication lines and bandwidth resources to establish a standardized telecommunications professional computer room environment to provide enterprises and governments with all-round services such as server hosting, leasing and related value-added. That is, the company that owns the server puts the server in the data center, which is what we usually call server leasing and hosting and other related businesses.
Idc Computer Room, namely Internet Data Center (IDC), refers to the establishment of a standardized computer room environment for telecommunications professionals by using existing Internet communication lines and bandwidth resources, providing enterprises and governments with all-round services such as server hosting, leasing and related value-added.
By using telecom's IDC server hosting service, enterprises or government units can solve many professional needs of using the Internet without building their own dedicated computer rooms, laying expensive communication lines or hiring high-paying network engineers.
The main applications of IDC host are website publishing, virtual host and e-commerce. For example, website publishing, the unit can publish its own www site and widely publicize its products or services through the Internet after allocating the static IP address from the telecommunications department to the Internet through the hosting host; Virtual host is a unit that rents out the massive hard disk space of its own host through hosting host, provides virtual host service for other customers, and makes itself an ICP service provider; E-commerce refers to the establishment of its own e-commerce system through the hosting host, and provides perfect services for suppliers, wholesalers, distributors and end users through this commercial platform.
IDC is the internet data center. With the continuous development of the Internet, it has developed rapidly and has become an indispensable part of the Internet industry in China in the new century. Provide large-scale, high-quality, safe and reliable professional server hosting, space leasing, network wholesale bandwidth, ASP, EC and other services for Internet content providers (ICP), enterprises, media and various websites.
At present, IDC (Internet Data Center) does not have an authoritative definition, but it has a deeper connotation than the traditional data center. It is developed with the continuous development of the Internet, providing large-scale, high-quality, safe and reliable professional server hosting, space leasing, network wholesale bandwidth, ASP, EC and other services for ICP, enterprises, media and various websites. Data center appeared in the mainframe era, which provides management and maintenance of mainframes to enterprises through hosting, outsourcing or centralized methods, so as to achieve the purpose of professional management and reduce operating costs.
IDC is the place where enterprises, merchants or web server groups are hosted; It is the infrastructure for the safe operation of various e-commerce modes, and it is also a platform to support enterprises and their business alliances, their distributors, suppliers and customers to implement value chain management.
IDC has two very important characteristics: its position in the network and the total bandwidth capacity of the network, which constitute a part of the basic network resources. Just like backbone networks and access networks, IDC provides high-end data delivery services and high-speed access services.
Common access methods of IDC
1, dual IP and dual-wire implementation
The realization of double IP and double lines is to install two network cards on a server, connect the telecom network cable and the netcom network cable respectively, and set up a Netcom IP and a Telecom IP, so that a server has two IP addresses, and it is necessary to add a routing table of Netcom or Telecom on the server to realize the access of Netcom users and telecom users from different lines respectively. There are two common ways for dual IP dual wires:
1.ICP users set up two links with different IP addresses on the website. Netcom users click Netcom IP to access the server, and telecom users click Telecom IP to access.
2. Use BIND9(DNS server software) to request different server IPS for different IP addresses, so that Netcom users can return Netcom IP when they request domain names, and telecom users can return telecom IP when they request domain names. This way is just some intelligent DNS schemes proposed by IDC.
Dual IP and dual lines have improved the speed of access to websites for CNC and telecom users to a certain extent, but the disadvantage is that because the server accesses dual network cards, it is necessary to set a routing table on the server, which increases the maintenance difficulty for ordinary users. All data packets need to be routed on the server and then sent to different network cards, which takes up a lot of server resources in the case of large visits. This solution is the simplest two-wire solution and is usually limited to smaller IDC providers.
2, single IP double line
Ordinary single IP double-wire refers to the double-wire technology that an IP is set on the server, which is Netcom IP or Telecom IP, and the data packets are set by the routing equipment through the telecom network or Netcom network. This scheme can also improve the access speed of CNC users and telecom users, and solve the problem that dual IP lines need to be routed on the server. However, because the IP address is netcom or telecom IP, the access user will not automatically judge the best route when sending the request packet. Therefore, this scheme can only be said to be a semi-double-line technical scheme and a transitional scheme. This scheme is generally a temporary scheme adopted by single-line IDC service providers during the transition from double-line IDC service providers.
Single IP dual-wire realized by BGP protocol
BGP (Border Gateway Protocol) protocol is mainly used for interconnection between Internet AS (autonomous systems). The main function of BGP is to control the spread of routes and choose the best route. Both China Netcom and China Telecom have AS numbers, and most major domestic network operators are interconnected with their AS numbers through BGP protocol. Using this scheme to realize the double-line needs 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 network operators such as China Netcom and China Telecom through BGP protocol. After interconnection through BGP protocol, all backbone routing equipment of China Netcom and China Telecom will judge the best route to the IP section of IDC computer room, so as to ensure the high-speed access of China Netcom and telecom users.
Using this scheme has the following advantages:
The 1. server only needs to set an IP address, and the best access route is determined by the backbone router on the network according to the technical indicators such as routing hops, and will not occupy any system resources of the server. The optimal path can be selected for both the uplink path and the downlink path of the server, so as to truly realize high-speed single IP dual-wire access.
2. Because BGP has the characteristics of redundant backup and loop elimination, when IDC service providers have multiple BGP interconnection lines, they can realize mutual backup of routes, and when one line fails, it will automatically switch to other lines.
3. The use of 3.BGP protocol can also make the network have strong expansibility, which can interconnect IDC network with other operators, easily realize single IP and multiple lines, and enable users of all interconnected operators to access quickly. This is unmatched by double IP and double wires.
Although BGP is the best solution, it needs a lot of equipment and bandwidth investment from IDC providers, and it is technically complicated, so at present, only professional IDC service providers with strong strength are in use in China.
To sum up, the implementation of the above two lines has its own advantages and disadvantages. The cost of dual IP dual-wire is low, but the network is not stable enough and takes up a lot of server resources. Ordinary single IP dual-line only achieves the effect of partial dual-line, so the access speed is not good. CDN method works well for static web pages, but it is not ideal for interactive web pages. BGP single IP dual line is the best way to solve all the above problems, but few IDC service providers adopt this scheme in China. If we can accelerate the combination of BGP single IP dual-line and CDN, it is possible.