ZyXEL Communications P-660R-F1 series, Руководство пользователя

Страница: 169 / 268

Chapter 13 Remote Management Configuration
P-660R-F1 Series User’s Guide
169
13.6 SNMP
Simple Network Management Protocol (SNMP) is a protocol used for exchanging management
information between network devices. SNMP is a member of the TCP/IP protocol suite. Your ZyXEL
Device supports SNMP agent functionality, which allows a manager station to manage and monitor
the ZyXEL Device through the network. The ZyXEL Device supports SNMP version one (SNMPv1)
and version two (SNMPv2). The next figure illustrates an SNMP management operation.
Note: SNMP is only available if TCP/IP is configured.
Figure 102
SNMP Management Model
An SNMP managed network consists of two main types of component: agents and a manager.
An agent is a management software module that resides in a managed device (the ZyXEL Device).
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.
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.