Introduction and business handling of the egress of CEN

Introduction and business handling of the egress of CEN

This time I will introduce you to the wide area network outlets in the enterprise network. When talking about the networking construction and equipment debugging of Enterprises (units), I think that as long as I have experience working on the internet, or the system administrator is familiar with core switches, VLAN division, layer-3 routing, firewall (router) and NAT. It's easy to learn. In this article, we will not mention how the device is configured for the moment. First, let's talk about the egress of the enterprise network.

I divide the WAN egress in the enterprise network into two types.

First, the fiber-optic Internet service applies for fiber-optic access from ISP operators such as China Telecom or China tietong to activate the Internet Service, also known as the Internet service. This type of Wan egress is required for enterprise networking, because employees of the company need to send and receive emails and query information on the network. If you do not have this job, you will not be able to send it.

This is the most basic network topology, which is also widely used in enterprises. It means that the computer is connected to a layer-2 switch, and NAT is implemented on the router through the core layer-3 switch, so that the company's internal computer can be connected to the Internet. This is what I call the first "fiber-optic Internet service"

The process for such a business is:

1. first determine whether the company (unit) needs the ISP operator, China Telecom or China tietong. After confirmation, go to the business office of the local IPS operator to handle the business. Some enterprises are large in size and there will be major account managers directly from the operator for reception. Contact your contacts directly.

Note: you may need to carry the Organization's qualifications (organization code certificate, a copy of the business license, and some must also be stamped with the official seal on the copy of the Business License)

2. Determine the bandwidth rate of your organization (company. Use 10 m optical fiber, 50 m optical fiber, or m optical fiber. After confirming, we can further discuss the specific costs.

Note: In this step, some companies will need to explain the text. Is to write something similar to the situation description. The specific fee (Network fee) must be clearly stated above, for example, 10 m optical fiber is 1000 yuan per month. At the end, you can write the following words: "No, Please give instructions. After completion, ask the supervisor to sign and confirm. If some companies have strict requirements, they must follow the process in the form of contract signatures.

3. after the process is completed, the operator will establish the optical fiber. First, the operator will look for the construction to go to the data center of your organization in advance to view the location of your data center, from where the construction is better, we will interview the IT staff of the organization to see the construction time.

4. The construction team and the IT staff of the organization determine the specific construction time. The construction team will place a rough Optical Cable (this is only a optical cable) for the Unit's data center. Instead of optical fiber, it cannot be used directly)

5. The operator's personnel perform the fusion and provide devices such as the photoelectric converter to convert the optical port into a standard RJ45 interface.

Confirm with the IDC to officially activate the network. :

Note: At this time, the staff will give you a network activation confirmation form, and will also tell you the fixed IP address assigned to you (this is a precious Internet public IP address) You must remember. It is best to write it down with a pen. Or use a camera.

6. Perform a network test to test whether the network is in normal use. The simplest and most stupid way is to use a laptop to plug in a network cable with your public IP address. If you can access the Internet, it is normal.

Type 2: Digital leased line service (also called digital link and SDH leased line)

The egress of this Wan is only used by enterprises that manage chains or have headquarters-divisions in the same city. The headquarters is the core data center, which contains server groups, such as financial servers, ERP servers, and email servers. The Branch needs to connect to the server of the master store to obtain data information. The primary store also needs to know the data of the branch. The structure is as follows:

This is equivalent to a dedicated line set up by the operator between the Headquarters and the branch of the factory, or it can be understood as directly using a "network cable" to connect the Headquarters and the branch.

The procedure for this business is the same as that for the first one, but it is different in terms of equipment and testing.

The device for this service uses a protocol converter. Is E1 to Ethernet (RJ45)

The device provided is one for the headquarters and one for each branch, that is, one for two. During the test, the IT staff at the headquarters and the branch must be there at the same time. The test method is as follows. Plug in the network cable directly with your laptop and use the private IP address in the same network segment. For example, if the Headquarters IT maintenance staff configures an IP address whose 1.1.1.1 mask is 255.255.255.0 on the laptop, the Branch IT maintenance staff configures a PING from the IP address. 2 whose 1.1.1.2 mask is 255.255.255.0 on the notebook. If the package is not dropped, the test can be completed.