BGP statistics overview

Introduction to CPAM BGP statistics

The CPAM retrieves BGP MIB statistics collected by the CPAA. You can use the CPAM to view statistics data in tabular or graphical form, save the tabular or graphical data to a file in various formats, and export the statistics data to OSS applications.

You can view BGP statistics from the Statistics tab of a monitored object properties form.

The NFM-P plotter is used to plot all of the statistics in both historical and real-time mode. The CPAM supports all of the capabilities of the NFM-P plotter for BGP statistics.

All of the restrictions of the NFM-P plotter apply to BGP statistics, including the total number of CPAM statistics that can be collected by the NFM-P, and the minimum number of days the statistics are maintained.

Note: The CPAM statistics collection constraints must be considered when you configure statistics collection policies. See the Statistics scalability section for more information.

Before the CPAA can collect statistics, you must configure statistics MIB policies that specify the following:

the objects from which to collect statistics
the counters to collect
the rate of collection
the length of time that the CPAM saves the statistics

See CPAM MIB statistics policies for more information about statistics MIB policies.

Statistics scalability

The CPAM supports the large-scale collection of statistics from the managed network. Performance, accounting, and server performance statistics can be collected according to a schedule and are stored for a configurable period. The following formula is used to calculate the storage capacity that scheduled collection consumes:

(number of objects to collect from) x (collection frequency) x (retention period)

When a statistics collection policy or an accounting policy applies to many objects, the collection interval must be large enough to collect the data. If the statistics collection time exceeds the collection interval, the CPAM raises an alarm.

Note: To prevent statistics loss and performance degradation, Nokia recommends that you stay within the specified maximum guidelines and ensure that each collection interval is long enough for the number of statistics to be collected during the interval.

Graphical statistics view

Statistics can be viewed in a graph using the NFM-P statistics plotter. The plotter can display multiple performance, accounting, and server performance statistics simultaneously using dual axes. The plotter also provides a numerical value for each point on the graph.

Each NFM-P client can open up to five statistics plotters, and each plotter can simultaneously plot up to four counters. Plotters can have independent Y axes on the left and right sides of a graph, and any counter can be assigned to one of the Y axes.

A plotter can plot historical or real-time statistics. Historical plots use stored statistics from earlier collections. The plotter automatically plots all of the stored values for the specified counter. Real-time plots collect statistics while the plotter window is open and plot the data as the data is collected.

For real-time statistics, when multiple NFM-P clients each have multiple open plotters that are displaying multiple counters, a high volume of statistics is collected from the CPAAs.

Note: If the collection for many of the plotters is from the same CPAA, the CPAA is polled independently for each plotter, which may degrade performance. You can use a scope of command role to limit plotter access to specific NFM-P user groups.

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