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Dimension ES-4024 Ethernet Switch
18-2 Access Control
18.3 About SNMP
Simple Network Management Protocol (SNMP) is an application layer protocol used to manage and monitor
TCP/IP-based devices. SNMP is used to exchange management information between the network management
system (NMS) and a network element (NE). A manager station can manage and monitor the ES-4024 through the
network via SNMP version one (SNMPv1) and/or SNMP version 2c. The next figure illustrates an SNMP
management operation. SNMP is only available if TCP/IP is configured.
Figure 18-3 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 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:
Table 18-2 SNMP Commands
COMMAND DESCRIPTION
Get Allows the manager to retrieve an object variable from the agent.
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