Network management - Control of Remote Monitors

A remote monitor can be implemented either as a dedicated device or as a function available on a system. A remote monitor is capable of performing more complex tasks and a wider range of functions than would be expected of an agent that just supports MIB (Management Information Base).

In order to manage a remote monitor effectively, the RMON MIB contains features that support extensive control from the management station.

These features fall into two general categories:

1. Configuration
2. Action Invocation

Configuration:

Configuration dictates the type and form of data to be collected. The RMON MIB is organized into a number of functional groups within each group, there may be one of more control tables and one or more data tables.

Data table --> Read only.
Control table --> Read-Write. contains parameter that describe the data in a data table.

Functions to be performed by a monitor are defined and implemented in terms of table rows. At the configuration time, the management system sets the appropriate control parameters to configure the remote monitor to collect the desired data. The parameters are set by adding a new row to the control table of by modifying an existing row. As information is collected according to the parameters setting of a control row, the data are stored in rows of the corresponding data table.

Active Invocation
In SNMP, there is no specific mechanism for issuing a command to an agent to perform an action. But it is possible to use an object to represent a command, so that a specific action is taken if the object is set to a specific value. A number of such objects are included in the RMON MIB. These objects represent states and an action is performed if the management station changes a state. A request to set an abject to its current value does not cause an action to be performed.


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