ZyXEL Communications Plumbing Product metrogigabit switch User Manual

 Chapter 39 Access Control

MGS3700-12C 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: 

SNMP v3 enhances security for SNMP management. SNMP managers can be 
required to authenticate with agents before conducting SNMP management 
sessions.

Security can be further enhanced by encrypting the SNMP messages sent from the 
managers. Encryption protects the contents of the SNMP messages. When the 
contents of the SNMP messages are encrypted, only the intended recipients can 
read them. 

MIBs let administrators collect statistics and monitor status and performance.

The Switch supports the following MIBs:

• SNMP MIB II (RFC 1213)
• RFC 1157 SNMP v1
• RFC 1493 Bridge MIBs
• RFC 1643 Ethernet MIBs
• RFC 1155 SMI
• RFC 2674 SNMPv2, SNMPv2c
• RFC 1757 RMON
• SNMPv2, SNMPv2c or later version, compliant with RFC 2011 SNMPv2 MIB for 

IP, RFC 2012 SNMPv2 MIB for TCP, RFC 2013 SNMPv2 MIB for UDP

Table 125   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.