
Configuring SNMP, RMON, BOOTP, DHCP, and RARP Services
2-20 114070 Rev. B
History Group
When you enable the Ethernet DCM, the RMON agent automatically creates a
History configuration that collects History data at two intervals. The first
configuration provides short-term history by sampling statistics every 30 seconds
and holding up to 50 samples (in RMON terms, “buckets”). The second
configuration provides long-term history by sampling statistics every 30 minutes
and holding up to 50 buckets.
Through your RMON network management application, you can create as many
History configurations as memory permits, up to the RMON limit of 65,535
configurations.You can also set the number of buckets a particular History
configuration uses to as many as available memory allows. If you request more
buckets than memory allows, the agent allocates enough buckets to fill available
memory.
You need 504 bytes of memory for each History configuration (252 bytes each for
the short-term and long-term History configurations).
The History data requires 52 bytes of memory per bucket. You calculate the total
memory (in bytes) you need to store the data as follows:
number of buckets * 52 * 2 History configurations
This calculation shows that you need approximately 5.1 KB for the default setting
of 50 buckets.
Host Group
When you enable the Ethernet DCM, the default setting (Disabled) for the RMON
Default Host parameter will not create a Host configuration. To create a Host
configuration, set the RMON Default Host parameter to Enable before you enable
the Ethernet DCM. For instructions on how to enable the Ethernet DCM, refer to
Chapter 1.
Some RMON network management applications expect the Ethernet DCM to set
up a Host configuration, while others set up their own configurations.
Note: The RMON agent allows you to create only one Host configuration. Be
sure to set the RMON Default Host parameter according to the expectations of
the RMON network management application.
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