
Using RMON Services
114070 Rev. A 2-7
Packet Capture Group
The Packet Capture group enables the capture of packets that satisfy the Filter
group control parameters for a particular channel. Control parameters in the
bufferControlTable specify how to transfer data from the channelTable to the
captureBufferTable. For example, you can specify the maximum number of octets
from each packet that the group should store in the captureBufferTable. To use the
Packet Capture group, you must set up the Filter group.
RMON Interoperability Issues
This section describes RMON memory use and interoperability issues you should
consider when using RMON network management applications with the Ethernet
DCM. This section also assumes that you have a good understanding of each
RMON group, and does not refer to the low-level details of the MIB, such as
RMON MIB objects. Refer to “The RMON Groups” earlier in this chapter, and
RFC 1757 for information about each RMON group.
Some network management applications automatically set up their own
configurations for an RMON group, without checking to see if the RMON agent
already has a default configuration. In addition, when you terminate those
applications, they may not remove the configurations they set up for the RMON
agent. These features can result in the RMON agent using excessive amounts of
memory and processing power.
Example
When you enable an Ethernet DCM, the RMON agent automatically creates a
History configuration. Suppose you then start a third-party RMON History
application that creates its own History configuration for the agent. The RMON
agent stores the data in two places, wasting memory.
In addition, when you terminate the third-party RMON application, it does not
remove its History configuration, using memory and processing power
indefinitely.
You can only release these resources by using another application, such as the
SNMP tool or network management station, or by resetting the Ethernet DCM. If
you use too many resources for an RMON task, the DCM can run out of memory
for other RMON tasks and perform more slowly.
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