How to choose lan switches?

Lan switches itself has certain management efficiency. As for the stacked lan switches, it has another advantage, that is, it can manage several stacked lan switches

Lan switches itself has certain management efficiency. As for the stacked lan switches, it has another advantage, that is, it can manage several stacked lan switches as 1 lan switches without managing and monitoring each lan switches separately. Do you know that?/You know what? Here are some information about shopping in lan switches, which I have sorted out for your reference.

Lan switches purchase function 1. Measurability

Scalability and manageability are the main issues in choosing lan switches. Good scalability is not just that the product has many ports. Because the most important thing in the application of lan switches is to determine under what circumstances its ports will be congested or saturated. Therefore, users need to consider the following key issues: internal scalability between two stacked lan switches, and what is the maximum scalability? How many ports can increase the transmission rate from 10Mbit/s to 10mb it/s when lan switches is overloaded? What is the highest connection speed of an external scalable LAN switch? For example, a stackable LAN switch with 1 24 user ports. Note that the term "user port" is used consciously here, because in fact, there are still some ports in the LAN switch that must be allocated to servers and internal or external connections. Assuming that the traffic that these 24 ports can transmit is 10Mbit/s, the connection speed of this lan switches is 1 Gbit. Because when the transmission rate of 8 ports reaches 100Mbit/s, the total traffic is 800 mbit/s, and the remaining 16 ports, each with a speed of 10Mbit/s, the total * * * is only160 mbit/s. If lan switches is connected at a speed of 2Gbit, it can only handle 19 fast Ethernet ports at most, otherwise congestion will occur. Therefore, the scalability of lan switches directly determines the ability to upgrade the transmission rate of each information point in the LAN.

Lan switches shopping features II. Easy to handle

Research shows that, like all network equipment, the implementation and management costs in lan switches far exceed the purchase costs. Based on this consideration, manageability has become another key factor in evaluating regional network switches. Generally speaking, lan switches itself has certain management efficiency. As for the stacked lan switches, it has another advantage, that is, it can manage several stacked lan switches as 1 lan switches without managing and monitoring each lan switches separately. It should be noted that the manageable contents include the quality of service QoS for handling priority traffic, the ability to enhance policy management, the ability to manage virtual area network traffic, and the difficulty of configuration and operation. Among them, QoS performance is mainly manifested in reserving the required bandwidth to support the requirements of different service levels. Manageability also includes the support of devices for policies, which are a set of rules that control lan switches's work. Network administrators use policies to allocate bandwidth, assign priority to each application traffic, and control network access. It focuses on bandwidth management policies and must meet SLA service level agreements. Decentralization strategy is an important content of stacked lan switches, because it is very troublesome to configure 1 lan switches at a time, and it is easy to produce some potential errors. When a new policy is adopted, it may be necessary to quickly change the configuration of many LAN switches. Therefore, it should be checked whether the stackable LAN switch supports directory network or lightweight directory access protocol LDAP to improve the manageability of the LAN switch.

Characteristics of lan switches's choice 3. Port bandwidth and type selection

When choosing what type of lan switches, users should first consider the bandwidth requirements of their own networking, and then consider the bandwidth design of lan switches port. In terms of port bandwidth configuration, there are currently n×10 mbit/s+m×100 mbit/s low-speed port dedicated type, N× 100 Mbit/s port adaptive type and N× 1000 Mbit/s port adaptive type on the market. The first configuration is n× 10 mbit/s+m× 100 mbit/s low-speed port dedicated type, which can generally complete the data of trunk operation100 mbit/s full duplex and branch operation10 mbit/s. From a technical point of view, lan switches's The second configuration is n× 10M/ 100Mbit/s port adaptation type, which is the mainstream product in the market at present, because they have automatic function, which can detect whether the bandwidth of their downlink equipment is 100Mbit/s or 100Mbit/s, which is full duplex. When the network card is connected to lan switches, if the network card supports full duplex, the bandwidth of this link can be 100Mbit/s for sending and receiving, and the bandwidth of 200Mbit/s can be realized. The same situation may also occur in the connection between lan switches and lan switches, and the application environment is very wide and light. The third configuration is dedicated for N×1000 mbit/s+M×100 mbit/s high-speed ports, which is similar to the configuration of the first lan switches, except that the bandwidth is several orders of magnitude more and the port types are completely different. That is to say, lan switches with this configuration scheme is an important device in the current high-speed network and optical fiber network access scheme, which can completely solve the bottleneck problem between network servers, but the cost is much higher than that of the first two types of products.

Lan switches shopping characteristics. VLAN selection

VLAN technology is mainly used to manage the traffic of VLAN users between lan switches. At present, most lan switches supports the VLAN standard defined by IEEE802. 1Q additional protocol, thus using lan switches port, MAC address and Layer 3 protocol and strategy to support VLAN implementation. Lan switches's VLAN function can be used for broadcast control, grouping slots and simplifying host management. Its biggest feature is that all hosts and terminal devices physically connected to the same lan switches can be divided into multiple logical LANs according to the needs of user applications. Hosts on the same logical LAN can exchange data with each other, but hosts on different logical LANs cannot access each other, and different logical LANs can share the same physical server, thus helping users to manage hosts reasonably. As an effective means of network management, VLAN has been widely used. However, different manufacturers put forward different standards. Using different standards to divide VLAN not only has great functional differences, but also brings confusion to network management. The initial VLAN division was based on ports, and most lan switches manufacturers in Taiwan Province Province followed this standard. The newer VLAN product division standard can not only realize VLAN port, but also support VLAN based on MAC address and VLAN based on protocol. However, these products generally follow the CGMP Cisco GroupManagement protocol, while the products of Intel and Company 3 only follow the IEEE802. 1Q standard. This shows that the new VLAN standards are not unified, and users must pay attention to whether these standards are unified with the VLAN you need when choosing.

Characteristics of lan switches's choice 5. Selection of multimedia broadband lan switches.

Modern local area networks (LANs) are increasingly switching 100 megabit high-speed Ethernet to the desktop, thus realizing VOD video-on-demand service within the LAN. Especially with the popularization of intelligent residential areas, people pay more and more attention to the video, audio and residential property management brought by broadband high-speed networks. Obviously, such a broadband application environment is an important field of switches. Therefore, if users want to build such a high-speed broadband LAN, they should pay attention to the following aspects when choosing lan switches. The first is the high bandwidth of the backplane. Every information point of broadband LAN is above 10Mbit/s, and some even make each information point reach100mbit/s. Therefore, when users build multimedia broadband networks, in principle, the higher the bandwidth of the backplane, the better, because it can provide high-speed switching channels for lan switches under high load, and at the same time leave enough space for users' clients and LAN system upgrades. Secondly, the port line speed is higher, that is, how many packets each port can handle per second. Then there is the packet conversion capability, that is, the number of packets that lan switches needs to forward every second. Finally, lan switches is required to provide QoS performance for network management and maintenance.

Lan switches's shopping characteristics. Do you choose the Layer 3 switching function?

The most obvious feature of the Layer 3 switching function is VLAN provided by lan switches, which is divided into covering broadcast packets and network security and network control management. This kind of Layer 3 lan switches, which can meet the needs of efficient communication between VLANs and is relatively expensive, is of little value to the LAN system widely used by small and medium-sized enterprises. Because VLAN division is of little significance to the internal security and network management of small and medium-sized enterprises with high independence. This low demand for security and network management can be accomplished by using the two-tier lan switches with mature technology, various types, stable efficiency and reasonable price. In fact, VLAN function can also be realized by using switches based on Layer 2 LAN, because users can provide efficient communication between different VLANs through the public port of Layer 2 lan switches, and can also control through authorization. In a word, the second-floor lan switches still has many advantages, which are worth considering by users.

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Read the article. "

1. LAN security policy

2. How to establish a regional network

3. How to establish a local area network simply?

4. LAN * * * Enjoy the detailed graphic setup tutorial.

5. How to enjoy the regional network?

6. How to share the resources of two computers in the LAN?

7. How to build a LAN with 30 computers?

8. Definition of regional network

9. How does regional network intrusion work?

10. How to build a local network?