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66 SNMP Management ELS100-24TXG
There are three main operations defined in SNMP:
•
Operations that read information from the managed device, such as
those used to obtain status or statistical data, are called GET
operations.
•
Operations that change a functional parameter on the device, such
as those used to configure Spanning Tree or to initiate a software
download, are referred to as SET operations. GET and SET
operations are initiated only by the manager software, and result in a
response by the agent.
•
The third operation type, the TRAP, allows 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 ELS100-24TXG 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
switches and hubs, 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 ELS100-24TXG switch supports four standard MIBs:
•
RFC 1213 - Management Information Base for Network
Management of TCP/IP based Internets (MIB-II)
•
RFC 1398 - Definitions of Managed Objects for the Ethernet-like
Interface Types (Ethernet MIB)
•
RFC 1493 - Definitions of Managed Objects for Bridges
•
RFC 1757 - Remote Network Monitoring Management Information
Base
The ELS100-24TXG switch also supports Cabletron proprietary MIB
extensions.
RFC 1213 (MIB-II)
RFC 1213 provides management of switch system-level parameters,
including TCP/IP protocol-related statistics, IP addressing, routing table
information, and interface statistics for each switch port. MIB-II is the
standard MIB defined by RFC 1213. All agent devices operating SNMP
are required to support at least part of MIB-II.