Network management refers to the centralized management of network resources by network administrators through network management procedures, including configuration management, performance and accounting management, problem management, operation management and change management. The degree of management supported by a device reflects the manageability and operability of the device.
The management function of the switch refers to how the switch controls the user's access to the switch and how visible the switch is to the user. Usually, switch vendors provide management software or remote management switches that satisfy third-party management software. General switches satisfy the statistical management function of SNMP MIB I/MIB II. More complex switching opportunities increase the ability to support RMON active monitoring through the built-in RMON group (mini-RMON). Some switches also allow external RMON to detect and monitor the network status of optional ports. Common ways of network management are as follows:
(1) SNMP Management Technology
(2) RMON Management Technology
(3) Web-based network management
SNMP is the abbreviation of "Simple Network Management Protocol" in English, which means "Simple Network Management Protocol" in Chinese. SNMP was first proposed by the Internet Engineering Task Force (IETF) research group to solve the problem of router management on the Internet.
SNMP is the most commonly used environmental management protocol. SNMP is designed to be protocol independent, so it can be used on IP, IPX, Apple Talk, OSI and other transport protocols used. SNMP is a series of protocol groups and specifications (see table below) that provide a way to collect network management information from devices on the network. SNMP also provides a way for devices to report problems and errors to network management stations.
At present, almost all network equipment manufacturers have realized the support of SNMP. The leading SNMP is a common communication protocol that collects management information from devices on the network. Equipment managers collect this information and record it in the Management Information Base (MIB). These information report device characteristics, data throughput, communication overload and errors, etc. MIB has a common format, so SNMP management tools from multiple vendors can collect MIB information and present it to system administrators on the management console.
By embedding SNMP into data communication devices, such as switches or hubs, these devices can be managed from a central station and viewed graphically. Many managerial applications currently available can usually run under most of the operating systems currently in use, such as Windows 3.11, Windows 95, Windows NT and different versions of UNIX.
A managed device has a management agent, which is responsible for requesting information and actions from the management station. The agent can also provide information for the management station by means of traps. Therefore, some key network devices (such as hubs, routers, switches, etc.) provide this management agent, also known as SNMP agent, in order to facilitate the operation of the management station. It is managed by SNMP management station.