Technical basics
4.7 SNMP
SCALANCE XB-200 Web Based Management
Configuration Manual, 04/2015, C79000-G8976-C360-02
35
The management station sends data packets of the following type:
● GET
Request for a data record from the agent
● GETNEXT
Calls up the next data record.
● GETBULK (available as of SNMPv2)
Requests multiple data records at one time, for example several rows of a table.
● SET
Contains parameter assignment data for the relevant device.
The SNMP agent sends data packets of the following type:
● RESPONSE
The agent returns the data requested by the manager.
● TRAP
If a certain event occurs, the SNMP agent itself sends traps.
SNMPv1/v2/v3 use UDP (User Datagram Protocol) and use the UDP ports 161 and 162. The
data is described in a Management Information Base (MIB).
Compared with the previous versions SNMPv1 and SNMPv2. SNMPv3 introduces an
extensive security concept.
SNMPv3 supports:
● Fully encrypted user authentication
● Encryption of the entire data traffic
● Access control of the MIB objects at the user/group level
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