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SNMP ISO/OSI Model
Implemented Protocol Stacks
Applicable Products
References
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 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
Applicable Products
 | ipConvLite | inexpensive protocol converter for standardized application
start price 2.500,- €
Details...
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 | ipConvPS | Universal protocol converter with integrated Profibus-DP, Slave interface
Details...
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| ipConvPM | Universal protocol converter with integrated Profibus-DP, Master interface
Details...
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 | ipConv | Universal protocol converter for highest degree of flexibility
Details...
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References
 | BLS AlpTransit - Lötschbergtunnel
Details...
| Switzerland | ipConv ipRoute | OPC DA 2.05 Server / IEC 60870-5-104, Slave / IEC 60870-5-101, Master / IEC 60870-5-104, Master / SNMP, Client / |
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