6 SIMPLE NETWORK MANAGEMENT PROTOCOL (SNMP)
Simple Network Management Protocol (SNMP) is a network protocol designed to manage devices in an IP network.
The MiCOM P40 Modular pr
oducts can provide up to two SNMP interfaces on Ethernet models; one to the IED’s
Main Processor for device level status information, and another directly to the redundant Ethernet board (where
applicable) for specific Ethernet network level information.
Two versions of SNMP are supported: Version 2c, and a secure implementation of version 3 that includes cyber-
security. Only the Main Processor SNMP interface supports Version 3.
6.1 SNMP MANAGEMENT INFORMATION BASES
SNMP uses a Management Information Base (MIB), which contains information about parameters to supervise. The
MIB format is a tree str
ucture, with each node in the tree identified by a numerical Object Identifier (OID). Each OID
identifies a variable that can be read using SNMP with the appropriate software. The information in the MIB is
standardized.
Each device in a network (workstation, server, router, bridge, etc.) maintains a MIB that reflects the status of the
managed resources on that system, such as the version of the software running on the device, the IP address
assigned to a port or interface, the amount of free hard drive space, or the number of open files. The MIB does not
contain static data, but is instead an object-oriented, dynamic database that provides a logical collection of
managed object definitions. The MIB defines the data type of each managed object and describes the object.
6.2 MAIN PROCESSOR MIBS STRUCTURE
The Main Processor MIB uses a private OID with a specific Alstom Grid number assigned by the IANA. Some items
in this MIB also support SNMP traps (wher
e indicated). These are items that can automatically notify a host without
being read.
Address Name Trigger Trap?
0 ROOT NODE
1 ISO
3 Org
6 DOD
1 Internet
4 Private
1 Enterprise
43534 Alstom Grid (IANA No)
1 Px4x
1 System Data
1 Description YES
2 Plant Reference YES
3 Model Number NO
4 Serial Number NO
5 Frequency NO
6 Plant Status YES
7 Active Group YES
8 Software Ref.1 NO
9 Software Ref.2 NO
10 Access Level (UI) YES
2 Date and Time
P14x Chapter 18 - Communications
P14xEd1-TM-EN-1 403
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