User manual

FL SWITCH MM HS
4-40
PHOENIX CONTACT 6874_en_09
4.3 Simple Network Management Protocol (SNMP)
4.3.1 General Function
SNMP is a manufacturer-independent standard for Ethernet management. It defines
commands for reading and writing information and defines formats for error and status
messages. 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 of an
FL SWITCH MM HS manages Management Information Base II (MIB 2) according to
RFC1213, RMON MIB, bridge MIB, If MIB, Etherlike MIB, Iana-address-family MIB,
IANAifType MIB, SNMPv2 MIB, SNMP-FRAMEWORK MIB, P bridge MIB, Q bridge MIB,
RSTP MIB, LLDP MIB, and private SNMP objects from Phoenix Contact
(FL-SWITCH-M MIB).
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.
Reading SNMP objects is not password-protected. However, a password is required for
read access in SNMP, but this is set to "public", which is usual for network devices, and
cannot be modified. By default upon delivery, the password for write access is "private" and
can be changed by the user.
All configuration modifications, which are to take effect after an MMS restart, must be
saved permanently using the "flWorkFWCtrlConfSave" object.
SNMP, the web interface, Telnet, and the serial terminal all use the same password,
which can be changed by the user.