ZyXEL Communications GS2200-24P Series, Руководство пользователя, Страница: 293 / 360

Chapter 32 Access Control
GS2200-24/24P User’s Guide
293
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 and Security
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.
Supported MIBs
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
SNMP Traps
The Switch sends traps to an SNMP manager when an event occurs. The following
tables outline the SNMP traps by category.
Table 95 SNMP Commands
COMMAND DESCRIPTION
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.