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Simple Network Management Protocol (SNMP)
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7 Simple Network Management Protocol (SNMP)
7.1 General function
SNMP is a non-proprietary standard for network management. It defines commands for
reading and writing information, and defines formats for error and status messages. SNMP
is also a structured model that consists of agents, their relevant Management Information
Base (MIB), and a manager. The manager is a software tool that is executed on a network
management station. The agents are located inside switches, bus terminals, routers, and
other devices that support SNMP. The task of the agents is to collect and provide data in the
MIB. The manager regularly requests and displays this information. The devices can be
configured by writing data from the manager to the MIB. In the event of an emergency, the
agents can also send messages (traps) directly to the manager.
SNMP interface
All managed Factoryline components have an SNMP agent. The agent of this type of device
manages the following MIBs (Management Information Bases):
– FL Managed Infrastructure MIB
– lldpMIB
– RFC1213 MIB
– rmon
– snmpMIB
– ifMIB
– snmpFrameworkMIB
– etherMIB
– pBridgeMIB
– qBridgeMIB
– dot1dBridge
– rstpMIB
– IP MIB
Network management stations, such as a PC with a MIB browser, can read and modify con-
figuration and diagnostic data from network devices via the Simple Network Management
Protocol. In addition, any SNMP tools or network management tools can be used to access
Factoryline products via SNMP. To do this, the MIBs supported by the relevant device must
be made available to the SNMP management tools.
On the one hand, these are globally valid MIBs, which are specified and described in RFCs
(Requests for Comments). This includes, for example, MIB2 according to RFC1213, which
is supported by all SNMP-compatible network devices. On the other hand, manufacturers
can specify their own SNMP objects, which are then assigned to a private manufacturer
area in the large SNMP object tree. Manufacturers are then responsible for their own private
(enterprise) areas, i.e., they must ensure that only one object (object name and parameters)
All configuration modifications, which are to take effect after a device restart, must be
saved permanently using the “flWorkFWCtrlConfSave” object.