9.2 Via SNMP
9.2.1 The Simple Network Managment Protocol
Most network connected devices support a number of management options including the Simple Network Man-
agement Protocol, or SNMP. SNMP is a network protocol which allows a single network management system
to monitor a large number of devices on the network.
The way it works is each network element has an Agent which communicates with the Manager via SNMP.
Each Agent has a corresponding Management Information Base, or MIB. The MIBs organize data elements in
a tree structure. It is written in a standard, highly structured language so that the MIBs from all of the devices
on the network can be compiled into the same Manager.
MIB elements are called Object Identifiers or OIDs. They consist of configuration variables, status variables,
tree structure labels and notifications. The OIDs can be read or changed using SNMP SET and GET commands.
There are also recursive commands which allow the Manager to ask for all of the OIDs in a branch (subtree), or
even the whole tree. This process is referred to as “walking the MIB”. Event Notifications, commonly referred
to as traps, are a special type of OID. A trap can be configured so that when the status of the device changes
a message is immediately sent from the Agent to the Manager.
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Date: 2nd July 2020
LANTIME CPU Expansion Shelf
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