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SNMP

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SNMP stands for 'Simple Network Management Protocol'. It belongs to the TCP/IP protocol family and enables the management of devices in an IP network, such as routers, switches, workstations etc. There are several variants which are defined in the corresponding RFCs:

  • SNMP V1
  • SNMP V2
  • SNMP V3

SNMP distinguishes between an agent (server) which supplies the data and a manager (client) which accesses the data.

Data transmission is based on the connectionless UDP protocol.

The data is encoded as per ASN.1 (ISO/IEC 8824), Basic Encoding Rules (BER).

OIDs or object identifiers are used for data addressing. An OID has a hierarchical structure consisting of a string of decimal numbers separated by a point '.', for instance  .1.3.6.1.2.1. Each number is assigned a symbol depending on the level to make it more readable, for instance .iso.org.dod.internet.mgmt.mib-2. The meaning of the numbers on each level is defined and also reveals the meaning of the object addressed this way.
The address space consists of a standardized and a proprietary part. In the standardized part, standardized information objects are defined (for instance MIB II), while the proprietary area is reserved for manufacturer-specific objects (.1.3.6.1.4.1 [.iso.org.dod.internet.private.enterprises]). Many manufacturers use their proprietary identifiers for managing device-specific information. MIB files encoded in ASN.1 format allow the definition of the information (Management Information Block).

ISO/OSI Model

7 Application Layer Simple Network Management Protocol (SNMP)
6 Presentation Layer ASN.1
BER (Basic Encoding Rules)
5 Session Layer n/a
4 Transport Layer UDP (RFC 768)
3 Network Layer IP (RFC 791)
2 Link Layer Transmission of IP datagrams over ethernet network (RFC 894)
1 Physical Layer Ethernet (IEEE 802.3)

Implemented Protocol Stacks

SNMP, Client

Applicable Products

ipConvLiteipConvLiteinexpensive protocol converter for standardized application
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ipConvPBSipConvPBSUniversal protocol converter with integrated PROFIBUS-DP, slave interface
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ipConvPBMipConvPBMUniversal protocol converter with integrated PROFIBUS-DP, master interface
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ipConvPNMipConvPNMUniversal protocol converter with integrated PROFINET-IO, master interface
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ipConvPNSipConvPNSUniversal protocol converter with integrated PROFINET-IO, slave interface
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ipConvipConvUniversal protocol converter for highest degree of flexibility
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References

BLS Lötschbergtunnel II, SwitzerlandBLS Lötschbergtunnel II, Switzerland
Details...
SwitzerlandipConv ipRoute IEC 60870-5-104, Master / IEC 60870-5-104, Slave / SNMP, Client /
BLS AlpTransit - LötschbergtunnelBLS AlpTransit - Lötschbergtunnel
Details...
SwitzerlandipConv ipRoute OPC DA 3.0, Server / IEC 60870-5-104, Slave / IEC 60870-5-101, Master / IEC 60870-5-104, Master / SNMP, Client /
Nordsee OneNordsee One
Details...
GermanyipConv Modbus, Master / IEC 60870-5-104, Slave / IEC 60870-5-101, Slave / IEC 61850, Client / IEC 61850, Server / OPC UA 1.02, Server / SNMP, Client /
WINGASWINGAS
Details...
GermanyipConvLite SNMP, Client / IEC 60870-5-104, Slave /
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