Figure 18-2 Snmp Management Model; Table 18-1 Snmp Commands - ZyXEL Communications dimension ES-4024 User Manual

Dimension ES-4024 Ethernet Switch
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 ES-4024). 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:
COMMAND
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.
18.2.1 Supported MIBs
MIBs let administrators collect statistics and monitor status and performance.
18-2

Figure 18-2 SNMP Management Model

Table 18-1 SNMP Commands

DESCRIPTION
Access Control