SNMP

The JUNOS software supports the Simple Network Management Protocol (SNMP), which helps you monitor the state of a router. The software supports SNMP Version 1 and Version 2 (also known as Version 2c, or v2c). The SNMP software is controlled by the JUNOS SNMP and Management Information Base (MIB) II processes, which consist of an SNMP master agent and various subagents.

For IPv6 implementation, the JUNOS software allows SNMP data over IPv6 networks. There is also support for providing IPv6-specific MIB data, as well as support for SNMP agents for IPv6.

The SNMP agent exchanges network management information with SNMP manager software running on a network management system (NMS), or host. The agent responds to requests for information and actions from the manager. The agent also controls access to the agent's MIB, the collection of objects that can be viewed or changed by the SNMP manager.

The SNMP manager collects information about network connectivity, activity, and events by polling managed devices.

Communication between the agent and the manager occurs in one of the following forms:

• Get, GetBulk, and GetNext requests—The manager requests information from the agent; the agent returns the information in a Get response message.
• Set requests—The manager changes the value of a MIB object controlled by the agent; the agent indicates the status in a Set response message.
• Traps—The agent sends traps to notify the manager of significant events that occur on the network device.

This chapter discusses the following topics:

• SNMP Standards
• Configure SNMP