Now that the network is so popular, the demand for switches is becoming more and more important, and there are so many types of switches on the market. We have also analyzed how to distinguish switches according to different situations before, but when browsing the names, we will also find that many switches The introduction of the network will write both 16 port managed switches and unmanaged switches, and its literal meaning has indeed been expressed very clearly. This time, the author summarizes what this "network management" does.
1. Unmanaged switches
First of all, let's talk about unmanaged switches. Unmanaged switches are also called fool switches. Simply put, they do not directly process data, just plug in the Internet cable.
The unmanaged switch belongs to the data link layer device, which can identify the MAC address information in the data packet, and then forward it according to the MAC address, and record these MAC addresses and corresponding ports in an internal address table.
Its advantage is that it is easy to use and plug and play, it can be used in series in a large number, it is suitable for use in places with high density of PC equipment, and the price is cheap and can save money.
2. 16 port Managed switch
The network management switch is literally a switch that can be managed by the network. There are three management methods, which can be managed through the serial port, through the Web management, and through the network management software.
The data of the 16 port managed switch will be configured through Simple Network Management Protocol (SNMP). SNMP protocol is currently the most widely used network management protocol based on TCP/IP network. Filtering, usually also has the function of VLAN division.
The task of a 16 port managed switch is to keep all network resources in good condition. The 16 port managed switch product provides various network management methods based on the terminal control port (Console), based on the Web page, and supports Telnet to log in to the network remotely. Therefore, network managers can perform local or remote real-time monitoring of the switch's working status and network operating status, and manage the working status and working modes of all switch ports globally.
3. What are the advantages of 16 port managed switches:
3.1 The backplane has a large bandwidth and a faster data forwarding speed;
3.2 There are many types of ports provided, and different interface forms are selected according to the application of the network, such as: SFP, GE, fast Ethernet port, Ethernet port, etc.;
3.3 Support the division of vlan, users can divide regions for different applications, effectively control and manage the network, and further suppress broadcast storms;
3.4 Large data throughput, small packet loss rate and low latency;
3.5 Link aggregation allows switches and switches and switches and servers to be bound together through multiple Ethernet ports to achieve load balancing;
3.6 The data flow can be controlled based on the source, destination and network segment;
3.7 It has the protection function of ARP to reduce the ARP spoofing of the network;
3.8 Can bind MAC address;
3.9 The port mirroring function can copy the traffic and status of one port to another port of the switch for supervision;
3.10 Support DHCP function;
3.11 Access Control List It can control IP data packets, such as restricting its flow, entering and leaving, and providing QoS, etc.;
3.12 has good security performance, can filter MAC addresses, lock MAC addresses, and build static MAC forwarding tables;
3.13 can support IEEE802.1Q and VLAN based on port technology. The GVRP (GARP, VLAN Registration Protocol) and GMRP (GARP Multicast Registration Protocol) involved in IEEE802.1QVLAN are also widely supported;
3.14 With SNMP function, it can better manage and control the network;
3.15 It is easy to expand and has flexible application. It can be managed by network management software, or it can be accessed remotely through its own access control, which increases the security and controllability of the network.
4. What are the structural characteristics of the industrial switch port number
If it is divided according to the port number structure of industrial switches, industrial switches can be roughly divided into two different structures: fixed port number industrial switches and modular design industrial switches. In fact, there is also a combination of the two, that is, a certain expansion slot or control module is configured on the basis of the basic fixed port number.
4.1 Industrial switches with fixed port numbers
The fixed port number means that the port number it contains is fixed. If it is an 8-port number, there are only eight port numbers, and it cannot be increased. 16 port numbers are only 16 port numbers, which cannot be expanded. At this stage, industrial switches with fixed port numbers are more common, and there is no established requirement for the total number of port numbers. The general port number specification is 8 port number, 16 port number and 24 port number. The number of non-standard ports is as follows: 4 port number, 5 port number, 10 port number, 12 port number, 20 port number, 22 port number and 32 port number, etc.
Although the fixed port number industrial switch is relatively lower in price, because it only provides a relatively limited port number and fixed type of sockets, no matter from the number of users that can be connected, or from the available transmission There are certain limitations in terms of methods, but this type of industrial switch is widely used in collaborative groups, and is generally suitable for small and medium-sized Internet and desktop exchange environments.
Industrial switches with fixed port numbers are further divided into platform-type industrial switches and rack-type industrial switches because of their installation structure. Like network switches, rack-mounted industrial switches are easier to manage and more suitable for large-scale Internet. Its structure must meet the national standard of 19 inches. It is used for interchange with other equipment or wireless routers. , network servers, etc. are centrally installed in a server cabinet. The platform-type industrial switch, because it only shows a small number of port numbers and cannot be installed in the server cabinet, is generally only used for small and medium-sized Internet.
4.2 Modular Design Industrial Switches
Although the modular design industrial switch is much more expensive, it has greater coordination ability and expandability. Customers can choose control modules with different total numbers, different speeds and different interface types at will to meet the various Internet requirements. In addition, most of the modular design industrial switches have a strong fault-tolerant mechanism and are suitable for redundant backup of interchangeable control modules, and usually have hot-swappable dual power switches to ensure the energy supply of the industrial switches. When choosing an industrial switch, a modular design or a fixed method should be considered comprehensively according to the necessity and budget. Generally speaking, company-level industrial switches should take into account their scalability, compatibility mode and troubleshooting, so modular design industrial switches should be adopted; while technical backbone industrial switches and cooperation group industrial switches are relatively simple because of their daily tasks. Therefore, a concise and clear mobile industrial switch can be selected.
