ZyXEL N4100 Guia Do Utilizador

N4100 User’s Guide

Simple Network Management Protocol (SNMP) is a protocol used for exchanging 
management information between network devices. Your N4100 supports SNMP 
agent functionality, which allows a manager station to manage and monitor the 
N4100 through the network.

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 device (the 
N4100). 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 44   SNMP Commands

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.