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Management Information Base (MIB) 559
MIB Objects The data in the MIB consists of objects that represent features of the
equipment that an agent can control and manage. Examples of objects in
the MIB include a port that you can enable or disable and a counter that
you can read.
A counter is a common type of MIB object used by RMON. A counter
object may record the number of frames transmitted onto the network.
The MIB may contain an entry for the counter object something like the
one in Figure 98.
Figure 98
Example of an RMON MIB Counter Object
The counter object information includes these items:
■
The name of the counter. In Figure 98, the counter is called
etherStatsPkts (Ethernet, Statistics, Packets).
■
Access level. In Figure 98, access is read-only.
■
The number of the counter’s column in the table. In Figure 98, the
counter is in column 5 of the
etherStatsEntry table.
The name of the table where the counter resides is 3CometherStatTable,
although this name does not appear in the display.
To manage a network, you do not need to know the contents of every
MIB object. Most network management applications, including Transcend
Network Control Services, make the MIB transparent. However, by
knowing how different management features are derived from the MIB
you can better understand how to use the information they provide.
MIBs include MIB-II, other standard MIBs (such as the RMON MIB), and
vendors’ private MIBs (such as enterprise MIBs from 3Com). These MIBs
and their objects are part of the MIB tree.
etherStatsPkts OBJECT-TYPE
SYNTAX Counter
ACCESS read-only
STATUS mandatory
DESCRIPTION
This is a total number of packets
received, including bad packets,
broadcast packets, and multicast
packets.
::= { etherStatsEntry 5 }