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Configuring RMON and RMON2

B-12

300018-A Rev. 00

Statistics Group

When you enable the Ethernet DCM, the RMON agent automatically creates a

statistics configuration that records data for each network interface. Through your

RMON network management application, you can create as many statistics

configurations as memory permits, up to the RMON limit of 65,535

configurations.

If you create multiple configurations, it is possible to collect the same set of

statistics for the same interface in multiple data tables. The absolute values of

those statistics may vary from table to table, because the baseline of each statistics

counter occurs when you create a configuration. You may prefer, however, to use

only one statistics configuration, to conserve memory for other RMON groups.

You need 200 bytes of memory for each statistics configuration.

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 (called 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 for a particular history

configuration 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.

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Avaya RMON2 Manual de usuario Pagina 80