ZyXEL Communications GS-1524 사용자 설명서

Chapter 18 SNMP

GS-1524/GS-1548 User’s Guide

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: 

MIBs let administrators collect statistics and monitor status and performance.
The Switch supports the following MIBs:

• RFC 1213 SNMP MIB II 

• MIB II - System
• MIB II - Interface

• RFC 1398 MIB - Ether-like
• RFC 2674 SNMPv2, SNMPv2c
• RFC 2819 RMON

• Group 1 (Statistics)
• Group 2 (History)
• Group 3 (Alarm)
• Group 9 (Event)

The Switch sends traps to an SNMP manager when an event occurs. SNMP traps supported 
are outlined in the following table.

SNMP v3 adds the concept of groups and users to enhance security for SNMP management. A 
user is an SNMP manager. A group is a group of SNMP managers that are assigned common 
access rights to MIBs. For example, one group of managers may only have access to agents 
with MIB II - System Group MIBs while another may have access to agents with  the Ether-
like MIB.

Table 38   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.

Table 39   SNMP Traps 

SNMPv1/SNMPv2 Trap/Inform Requests:

authenticationFailure

1.3.6.1.6.3.1.1.5.5

This trap is sent when an SNMP request comes from 

non-authenticated hosts.

RFC2819 Traps (alarmEntry)

1.3.6.1.2.1.16.3.1.1

A RMON event has been triggered.