Management Functions; Compact Switch Module - Siemens SIMATIC NET System Manual

Basics of communication with Industrial Ethernet
1.3 Technologies of Industrial Ethernet
See also
SCALANCE X Industrial Ethernet Switches (Page 133)
SCALANCE W components for the Industrial Wireless LAN (Page 203)
SCALANCE M industry router (Page 241)
SCALANCE S Industrial Security Appliance (Page 261)
Communications processors for PCs (Page 299)
Communications processors for SIMATIC S7 (Page 309)
Compact switch module (Page 343)
Accessories (Page 282)
1.3.4

Management functions

SNMP
With the aid of the Simple Network Management Protocol (SNMP), you can monitor and
control the network elements (e.g. routers, servers, switches, printers, computers etc.) from
a central station. SNMP controls the communication between the monitored devices and the
monitoring station.
SNMPv1 and SNMPv2c
In versions v1 and v2c, SNMP has no security mechanisms. Each user in the network can
access data and also change parameter assignments using suitable software.
For the simple control of access rights without security aspects, community strings are used.
The community string is transferred along with the query. If the community string is correct,
the SNMP agent responds and sends the requested data. If the community string is not
correct, the SNMP agent discards the query.
SNMP data packets are not encrypted and can easily be read by others. The monitoring is
handled by "SNMP agents". SNMP agents are programs that execute on the devices to be
monitored and send SNMP data packets to an SNMP manager. The data is described in a
Management Information Base (MIB). The RFC 1213 document contains the definition of the
MIB-2 important for SNMP.
40
System Manual, 09/2019, C79000-G8976-C242-10
Industrial Ethernet