ZyXEL Communications MAX218M2W, User Manual

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Chapter 12 Maintenance
MAX208M2W Series User’s Guide
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SNMP
An SNMP managed network consists of two main types of component: agents and
a manager.
Figure 78 SNMP Management Model
An agent is a management software module that resides in a managed device (the
MAX208M2W Series). 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 MAX208M2W Series 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.