
Configuring an Ethernet Data Collection Module
117341-A Rev. A 6-19
You calculate the total memory (in bytes) that you need to store the Host data as
follows:
105 * Value of the RMON Max Host parameter
HostTopN Group
To save memory and increase performance, there is no default configuration for
the HostTopN group. You must create HostTopN configurations through your
RMON network management application. You can create as many HostTopN
configurations as memory permits, up to the RMON limit of 65,535.
Each HostTopN configuration requires 164 bytes. The HostTopN data requires 10
bytes of memory for each host address the DCM detects on a segment.
You calculate the total memory (in bytes) that you need to store the HostTopN
data as follows:
10 * Value for the RMON Max Host parameter
See the previous section for information about setting the RMON Max Host
parameter.
Matrix Group
When you enable the DCM, the default setting (Disable) for the RMON Default
Matrix parameter prevents the DCM from setting up a Matrix configuration. To
create a Matrix configuration, set the RMON Default Matrix parameter to Enable
before you enable the DCM, as described in “Acti
vating the DCM” on page 6-8.
Some RMON network management applications expect the DCM to set up a
Matrix configuration, while others set up their own Matrix configurations.
Note: Before you create a HostTopN configuration, you must create a Host
configuration.
Note: The RMON agent allows you to create only one Matrix configuration.
Be sure to set the RMON Default Matrix parameter to match the requirements
of the RMON network management application.
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