A table of mappings from notification ids to RMON
events.
This table contains one row for each notification
type supported by the agent. It provides a way of
configuring an RMON eventTable entry to be triggered
whenever this notification occurs. This way, each
notification can be configured to use a particular
community name (which selects a set of entries in
the trap destination table to send the notification
to), and provides a common point for configuring the
action to take when the notification condition
occurs.