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management information between the network management system (NMS) and a
network element (NE). A manager station can manage and monitor the P-794H
through the network via SNMP version one (SNMPv1), SNMP version 2c or SNMP
version 3. The next figure illustrates an SNMP management operation. SNMP is
only available if TCP/IP is configured.
Figure 20 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
P-794H). 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
number of packets received, node port status and so on. 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 17 SNMP Commands
COMMAND
Get
GetNext
Set
Trap
P-794H User's Guide
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.
Chapter 5 System Settings
59
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