SNMP proxy principles

In the Simple Network Management Protocol, we know that SNMP proxy is a key application of this Protocol. In order to give you a clear analysis of this part, we have analyzed this in detail. Hope to help you. See the text below.

SNMP protocol details

SNMP: Simple Network Management Protocol is an Internet Engineering Task Force (IETF: Internet Engineering Task Force) A defined Network Management Protocol. This Protocol is based on the Simple Gateway monitoring Protocol (SGMP: Simple Gateway Monitor Protocol). With SNMP, a management workstation can remotely manage all network devices that support this Protocol, this includes monitoring network status, modifying network device configurations, and receiving network event warnings. Although SNMP was initially designed for IP-based network management, it was also successfully used as an industrial standard for telephone network management ｡

SNMP principles

SNMP adopts a special form of Client/Server model: agent/management station model. network management and maintenance are completed through the interaction between the management workstation and the SNMP agent. Each SNMP is responsible for answering the SNMP management workstation (master agent) from the agent) A variety of queries on snmp mib definition information. It is an implementation model of SNMP protocol in NMS network products ｡

SNMP implementation model

The SNMP Agent communicates with the management site through standard messages in the SNMP protocol. Each message is a separate datagram. SNMP uses UDP (User Datagram Protocol) as the layer-4 protocol (Transport Protocol ), the SNMP message contains two parts: the SNMP header and the Protocol Data Unit PDU. The datagram structure is as follows:

Datagram Structure

Version identifier: Make sure that the SNMP agent uses the same protocol. Each SNMP agent directly discards the datagram of a different protocol version. Group Name ): SNMP authenticates the SNMP Management site from the proxy. If the network is configured to require verification, the SNMP slave agent authenticates the group name and the IP address of the Management site. If the authentication fails, SNMP sends a Trap message for authentication failure to the management site from the proxy. Protocol Data Unit (PDU): PDU indicates the Message Type and related parameters of SNMP ｡