MULTILINK ML3000 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL 16–1
Multilink ML3000
Ethernet Communications Switch
Chapter 16: SNMP
GE Energy
SNMP
16.1 Overview
16.1.1 Description
SImple Network Management Protocol (SNMP) enables management of the network. There
are many software packages which provide a graphical interface and a graphical view of
the network and its devices. These graphical interface and view would not be possible
without SNMP. SNMP is thus the building block for network management.
16.1.2 SNMP Concepts
SNMP provides the protocol to extract the necessary information from a networked device
and display the information. The information is defined and stored in a Management
Information Base (MIB). MIB is the “database” of the network management information.
SNMP has evolved over the years (since 1988) using the RFC process. Several RFCs define
the SNMP standards. The most common standards for SNMP are SNMP v1 (the original
version of SNMP); SNMP v2 and finally SNMP v3.
SNMP is a poll based mechanism. SNMP manager polls the managed device for
information and display the information retrieved in text or graphical manner. Some
definitions related to SNMP are
• Authentication - The process of ensuring message integrity and protection against
message replays. It includes both data integrity and data origin authentication
• Authoritative SNMP engine - One of the SNMP copies involved in network
communication designated to be the allowed SNMP engine which protects against
message replay, delay, and redirection. The security keys used for authenticating and
encrypting SNMPv3 packets are generated as a function of the authoritative SNMP
engine's engine ID and user passwords. When an SNMP message expects a response
(for example, get exact, get next, set request), the receiver of these messages is
authoritative. When an SNMP message does not expect a response, the sender is
authoritative
• Community string - A text string used to authenticate messages between a
management station and an SNMP v1/v2c engine
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