RSTI-EP PROFINET I/O Controller User Manual
Section 7
GFK-2571R
May 2021
Network Management
144
The collections of management information maintained by agents and managed devices
are generally referred to as Management Information Bases (MIBs). A MIB is a collection of
information organized into a hierarchical structure where related items are grouped
together in “groups.” MIBs are used to organize and standardi
ze the management
information on agents and can be accessed via commands provided within the SNMP
protocol.
The SNMP protocol is currently defined by five protocol specifications: SNMPv1, SNMPv2,
SNMPv2c, SNMPv2u, and SNMPv3.
NMSs use four basic classes of SNMP commands to retrieve and alter data on managed
devices
•
The read (GET) command is used by an NMS to monitor managed devices through
examination of the values of different variables maintained within the managed
devices’ MIBs.
•
The write (SET) command is used by an NMS to control devices through modification of
the values maintained by the managed devices within their MIBs.
•
The trap (TRAP, INFORM) command is used by an NMS to get asynchronous
notifications when certain events occur on managed devices. In SNMP Version 2, traps
are not set via the protocol but are defined at the managed device by local action.
•
Traversal operations (GETNEXT and GETBULK) are used by an NMS to determine which
variables a managed device supports and to sequentially gather information from the
MIBs.
SNMP is a well-defined protocol; additional information is available in the literature and on
the World Wide Web.
7.1.2
Supported SNMP Features
The PROFINET Controller supports:
•
SNMPv1 and SNMPv2c
•
MIB-II (see RFC 1213 for details)
•
LLDP MIB (see IEEE 802.1AB for details)
•
LLDP 802.3 Extension MIB (see IEEE 802.1AB for details)
The PROFINET Controller does not:
•
Support SNMPv3.
•
Provide asynchronous notifications via SNMP.
•
Generate SNMP TRAP or INFORM messages.
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