Switch classification and selection
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For switches, many people have different names, some call it a three-layer switch, some call it a stack switch, and some call him a white card switch, so so many calls are the same switch?
The classification of switches is like the attributes of people. We all have different roles. In a family environment, a woman may be a daughter, mother, or wife. In a work environment, she may be a colleague or a leader. The identity is different in different scenarios. These are the labels of a person. The switch will have different labels in different scenarios. The key points are different depending on the basis of the division, as shown in the following figure.
In the above seven scenarios, you can expand the types of multiple switches. In fact, these categories do not conflict. A core switch is a three-layer switch with stackable and manageable functions. The core switch is still a three-layer switch, a stackable switch, and it is actually a device.
Although the name of the switch is a lot, but now it is common to divide according to the network composition, that is to say, generally compare the access layer switch, the aggregation layer switch, the core layer switch people are more common, then focus on the analysis of these three types of How to choose the switch.
The access layer, the aggregation layer, and the core layer are three-layer network architectures, in which the core layer is the backbone network, the aggregation layer provides a policy-based connection, and the access layer mainly connects devices, just like the organizational structure of the company, the upper management, the middle layer Management and grassroots employees perform their duties to ensure the normal operation of the company.
Access layer switch features
1. Features of the access layer switch:
The access layer switch mainly solves the access requirements between neighboring users. The shared address that is often used in the office is the credit of the access layer switch, so that users in the same local area network can access files under the specified path, which is greatly convenient. Everyday work. At the same time, in some large networks, the access layer switches also have user management and user information collection functions, such as user authentication, user ip identification, and so on.
2. Access layer switch selection suggestions:
The demand for access layer switches is very large. The switches connected at the terminals need to meet the multi-port low-cost characteristics. Therefore, the cost-effective factors are mainly considered, and the functional requirements are not very high.
Features of the aggregation layer switch:
1. Features of the aggregation layer switch:
The aggregation layer switch is the aggregation part of multiple access layer switches. It is used to transmit the information of the core layer switch and the access layer switch. The aggregation layer switch can implement the policy and implement routing between VLANs according to the edited program. , workgroup access, address filtering and other functions.
2. Suggestions for selection of aggregation layer switches:
Because of its position, its performance must be higher, and the exchange speed is faster to meet the needs of uploading and delivering.
Then some people will have doubts, if the number of switch ports in the core layer is sufficient, the performance is good enough, the application environment transmission distance is close, and the aggregation layer switch can be omitted, and the core switch is directly connected with the access layer switch.
The answer is yes, it is like some small companies have only one manager with leadership, others are equal, which can save a lot of intermediate costs, and network line inspection is more convenient to maintain.
Core layer switch features
1. Features of the core layer switch:
The core layer switches need to meet more conditions. As a backbone transmission network, high reliability, reliability, manageability, low latency, and the like are required.
2. Suggestions for selection of core layer switches:
Selecting the core switch should focus on comparing the throughput and bandwidth of the switch, and choose a manageable switch of Gigabit or even 10 Gigabit or more.

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