User manual

FL SWITCH LM
3-24
PHOENIX CONTACT 7278_en_01
3.3 Simple Network Management Protocol (SNMP)
3.3.1 General Function
SNMP is a manufacturer-independent standard for Ethernet management and defines
commands for reading and writing error and status message information and formats.
SNMP is also a structured model, which comprises agents and their relevant MIB
(Management Information Base) and a manager. The manager is a software tool, which 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 Factory Line components have an SNMP agent. This agent manages
Management Information Base II (MIB 2) according to RFC1213 MIB, bridge MIB, RSTP
MIB, RFC1907 MIB, and private SNMP objects from Phoenix Contact.
Network management stations, such as a PC with the Factory Manager, can read and
modify configuration and diagnostic data from network devices via the Simple Network
Management Protocol (SNMP). In addition, any SNMP tools or network management tools
can be used to access Factory Line products via SNMP. 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
(Request 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 private 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 is assigned
to an object ID (object name and parameters) and can be published. If an object is no
longer needed, it can be labeled as "expired", but it cannot be reused with other
parameters under any circumstances.
Phoenix Contact provides notification of ASN1 SNMP objects by publishing their
descriptions on the Internet.
All configuration modifications, which are to take effect after an LMS restart, must be
saved permanently using the "flWorkFWCtrlConfSave" object.