
Configuring SNMP, RMON, BOOTP, DHCP, and RARP Services
2-22 114070 Rev. B
You calculate the total memory (in bytes) you need for the HostTopN data as
follows:
10 * value of the RMON Max Host parameter
Refer to the previous section for information about setting the RMON Max Host
parameter.
Matrix Group
When you enable the Ethernet DCM, the default setting (Disabled) will not set up
the RMON Default Matrix parameter on the Ethernet DCM. To create a Matrix
configuration, set the RMON Default Matrix parameter to Enable before you
enable the Ethernet DCM (refer to Connecting AN and ANH Systems to a Network
for details).
Some RMON network management applications expect the DCM to set up a
Matrix configuration, while others set up their own configurations.
The Matrix configuration requires 212 bytes. The Matrix data requires
approximately 178 bytes of memory per source/destination pair the Ethernet
DCM detects on a segment.
Filter and Capture Groups
You must create Filter and Capture configurations through your RMON network
management application. You can create as many filters and capture buffers as
memory permits, up to the RMON limit of 65,535 configurations.
Memory requirements vary greatly according to the size and number of the filters
and the size of the capture buffer. In most cases, you need 3 to 5 KB of memory
for the Filter and Capture configuration.
Note: The RMON agent allows you to create only one Matrix configuration.
Be sure to set the RMON Default Matrix parameter according to the
expectations of the RMON network management application.
Caution: The memory you need for a Filter/Capture configuration and for
storing captured packets can easily exhaust all the available memory on an
Ethernet DCM, particularly if the filters are not selective.
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