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In this figure, the OID of the object A is 1.2.1.1. NMS can locate this object through
this unique OID and gets the standard variables of the object. MIB defines a set of
standard variables for monitored network devices by following this structure.
If the variable information of Agent MIB needs to be browsed, the MIB browse
software needs to be run on the NMS. MIB in the Agent usually consists of public MIB
and private MIB. The public MIB contains public network management information that
can be accessed by all NMS; private MIB contains specific information which can be
viewed and controlled by the support of the manufacturers
MIB-I [RFC1156] is the first implemented public MIB of SNMP, and is replaced by
MIB-II [RFC1213]. MIB-II expands MIB-I and keeps the OID of MIB tree in MIB-I. MIB-II
contains sub-trees which are called groups. Objects in those groups cover all the
functional domains in network management. NMS obtains the network management
information by visiting the MIB of SNMP Agent.
The switch can operate as a SNMP Agent, and supports both SNMP v1/v2c and
SNMP v3. The switch supports basic MIB-II, RMON public MIB and other public MID
such as BRIDGE MIB. Besides, the switch supports self-defined private MIB.
Introduction to RMON
RMON is the most important expansion of the standard SNMP. RMON is a set of
MIB definitions, used to define standard network monitor functions and interfaces,
enabling the communication between SNMP management terminals and remote monitors.
RMON provides a highly efficient method to monitor actions inside the subnets.
MID of RMON consists of 10 groups. The switch supports the most frequently used
group 1, 2, 3 and 9:
Statistics: Maintain basic usage and error statistics for each subnet monitored by
the Agent.
History: Record periodical statistic samples available from Statistics.
Alarm: Allow management console users to set any count or integer for sample
intervals and alert thresholds for RMON Agent records.
Event: A list of all events generated by RMON Agent.
Alarm depends on the implementation of Event. Statistics and History display some
current or history subnet statistics. Alarm and Event provide a method to monitor any
integer data change in the network, and provide some alerts upon abnormal events
(sending Trap or record in logs).
2.4.2 SNMP Configuration Task List
1. Enable or disable SNMP Agent server function
2. Configure SNMP community string
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