ZyXEL Communications IES4005M User Manual page 92

Chapter 11 Management
Figure 40 SNMP Management Model
An SNMP managed network consists of two main components: agents and a manager.
An agent is a management software module that resides in a managed switch (the system). An
agent translates the local management information from the managed switch 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 switch. 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.
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:
Table 63 SNMP Commands
COMMAND
Get
GetNext
Set
Trap
Supported MIBs
MIBs let administrators collect statistics and monitor status and performance. The system supports
the following MIBs:
• BRIDGE-MIB.mib
• IF-MIB.mib
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DESCRIPTION
Allows the manager to retrieve an object variable from the agent.
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.
Allows the manager to set values for object variables within an agent.
Used by the agent to inform the manager of some events.
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