Manual

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Москва, Новозаводская ул., 18, стр. 1
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ASN.1 Tree Instance
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.
2.4.3 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.