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82 SNMP Management VH-2402S
There are three main operations defined in SNMP:
• GET operations read information from the managed device, such as
those used to obtain status or statistical data.
• SET operations change a functional parameter on the device, such
as those used to configure Port Speed or to initiate a software
download. GET and SET operations are initiated only by the
manager software, and result in a response by the agent.
• TRAP operations allow the agent to send an unsolicited message to
the manager. This operation is typically used as an alert of a potential
problem or a change of status with the device. The Trap Destination
parameter in the SNMP Configuration Menu is used to configure the
IP addresses of the SNMP Manager to which VH-2402S trap
messages are sent.
MIB Objects
A number of standard MIB specifications have been defined for managing
network equipment. SNMP compliant devices typically support one or
more standard MIBs defined by the Internet Engineering Task Force
(IETF), in the form of Request for Comments (RFC) documents.
These MIBs provide a common method of managing devices, such as
hubs and switches, and network interfaces, such as Ethernet and token
ring. The primary standard MIB, referred to as MIB-II, provides an overall
view of the managed agent and must be supported, at least in part, by all
SNMP agents. In addition, proprietary MIB extensions are defined by
commercial vendors for managing device-specific functions of their
products.
The VH-2402S switch supports six standard MIBs:
• RFC 1213 - Management Information Base for Network
Management of TCP/IP based Internets (MIB-II)
• RFC 1573 - Evolution of the Interfaces Group of MIB-II
• RFC 1643 - Definitions of Managed Objects for the Ethernet-like
Interface Types (Ethernet-Like MIB)
• RFC 1493 - Definitions of Managed Objects for Bridges
• RFC 1757 - Remote Network Monitoring Management Information
Base
• IEEE 802.1Q - VLAN Bridge Management (Q-MIB)
The VH-2402S switch also supports Enterasys proprietary MIB
extensions.