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Jack Nally | Support Engineer
All Hirschmann managed switches support Simple Network Management Protocol (SNMP) which provides a common mechanism for network devices to relay management information within single and multi-vendor LAN or WAN environments. In this Tech Tip, we’ll show you how to use the built-in SNMP Browser in Industrial HiVision (IHV) to help you find relevant information from your switch.
MIB stands for Management Information Base and is a collection of information organised hierarchically. These are accessed using a protocol such as SNMP. There are two types of MIBs: scalar and tabular. Scalar objects define a single object instance whereas tabular objects define multiple related object instances grouped in MIB tables.
MIBs are collections of definitions which define the properties of the managed object within the device to be managed.
OIDs stands for Object Identifiers. OIDs uniquely identify managed objects in an MIB hierarchy. This can be depicted as a tree, the levels of which are assigned by different organisations. Top level MIB object IDs (OIDs) belong to different standard organisations.
Vendors, like Hirschmann, define private branches including managed objects for their own products.
Open IHV and select SNMP Browser from the Tools menu.
The default view of the SNMP Browser will look like this:
You can expand the different tree branches to browse various OIDs.
As an example, OID 18.104.22.168.22.214.171.124.1.8 ifOperStatus gives the status of each port on a network switch. You can find help and descriptions for each OID by right clicking the OID and selecting Show Attribute. Once you have the OID selected, press the Start Query (Walk) button to see the value of this OID. This example is connected to a switch at 10.0.100.101
You can also search for OIDs by selecting Edit -> Find and entering a string that matches the OID you want. For example, if you search “uptime”, you can find the OID for the time that the system has been operating for in hundredths of a second.
Note that the search will find the next OID that matches your search criteria down the tree from the OID currently selected, so it is best to start at the top of the tree.