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Home   |  Simple Network Management Protocol

Simple Network Management Protocol


SNMP (simple network management protocol)

SNMP is a set of protocols for managing complex networks. It is one of the most widely accepted protocols to manage and monitor network elements and is an application layer protocol that allows management stations to poll agents running on network devices for specific pieces of information.
 

SNMP
consists of a SNMP MANAGER, MANAGED DEVICES, SNMP Agent and MIB (Management Information Base).

SNMP Manager: The SNMP manager communicates with the SNMP agent implemented network devices. This is typically a computer that is used to run one or more network management systems.

SNMP Managers Key Functions include:
  • Queries agents
  • Receives responses from agents
  • Sets variables in agents
  • Acknowledges asynchronous events from agents
Managed Devices: A managed device is a part of the network that requires some form of monitoring and management e.g. routers, servers or workstations.


SNMP Agent: An SNMP agent is a program that is packaged within the network element. It collects the management information database locally from the device and makes it available to the SNMP manager.

The SNMP agents key functions are:
  • Collect management information about its local environment
  • Store and retrieve management information as defined in the MIB
  • Signals an event to the manager
  • Act as a proxy for some non-SNMP manageable network node

MIB (Management Information Base):
The SNMP manager uses the database to request the agent for specific information, then translates the information as needed for the Network Management System (NMS). The MIB files are the set of questions that a SNMP Manager can ask the agent.  Innovative Energies MIB files can be found here

SNMP Communication:
Being the part of the OSI & TCP/IP protocol suite, the SNMP messages are wrapped as UDP (user datagram protocol) and intern wrapped and transmitted using the Internet Protocol.

SNMP Commands Include:

  • GET: This is a request sent by the manager to the managed devices
  • SNMP Communication: Being the part of the OSI & TCP/IP protocol suite, the SNMP messages are wrapped as UDP and intern wrapper and transmitted in the Internet Protocol
  • SNMP: Command used to carry back the value(s) or signal of actions, directed by the SNMP Manager
  • GET NEXT: Command retrieves the value of the next OID (object identifier) in the MIB tree
  • GET BULK: Used to retrieve large amounts of data from large MIB tables
  • SET: This operation is used by the managers to modify or assign the value of the managed device
  • TRAPS: Traps are initiated by the Agents and are a signal to the SNMP Manager by the Agent
  • INFORM: This includes confirmation from the SNMP Manager upon receiving the message
  • RESPONSE: This is the command used to carry back the value(s) or signal of actions, directed by the SNMP Manager.

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