Snmp; Figure 96 Snmp Management Model - ZyXEL Communications MAX-206M2 User Manual

17.5 SNMP

An SNMP managed network consists of two main types of component: agents and a manager.

Figure 96 SNMP Management Model

An agent is a management software module that resides in a managed device (the WiMAX
Modem). An agent translates the local management information from the managed device into
a form compatible with SNMP. The manager is the console through which network
administrators perform network management functions. It executes applications that control
and monitor managed devices.
The managed devices contain object variables/managed objects that define each piece of
information to be collected about a device. Examples of variables include such as number of
packets received, node port status etc. A Management Information Base (MIB) is a collection
of managed objects. SNMP allows a manager and agents to communicate for the purpose of
accessing these objects. The WiMAX Modem supports MIB II that is defined in RFC-1213
and RFC-1215. The focus of the MIBs is to let administrators collect statistical data and
monitor status and performance.
SNMP itself is a simple request/response protocol based on the manager/agent model. The
manager issues a request and the agent returns responses using the following protocol
operations:
• Get - Allows the manager to retrieve an object variable from the agent.
• GetNext - Allows the manager to retrieve the next object variable from a table or list
within an agent. In SNMPv1, when a manager wants to retrieve all elements of a table
from an agent, it initiates a Get operation, followed by a series of GetNext operations.
• Set - Allows the manager to set values for object variables within an agent.
• Trap - Used by the agent to inform the manager of some events.
User's Guide
Chapter 17 The Remote Management Screens
175