Remote Network Monitoring (RMON) | Juniper Networks

The falling threshold is the lower threshold for the monitored
variable. When the current sampled value is less than or equal to
this threshold, and the value at the last sampling interval is greater
than this threshold, a single event is generated. A single event is
also generated if the first sample after this entry becomes valid
is less than or equal to this threshold, and the associated startup
alarm is equal to falling-alarm or rising-or-falling-alarm. After a falling event is generated, another falling event cannot
be generated until the sampled value rises above this threshold and
reaches the rising threshold. You must specify the falling threshold
as an integer. Its default is 20 percent less than the rising threshold.

By default, the rising threshold is 0. The rising threshold
is the upper threshold for the monitored variable. When the current
sampled value is greater than or equal to this threshold, and the
value at the last sampling interval is less than this threshold, a
single event is generated. A single event is also generated if the
first sample after this entry becomes valid is greater than or equal
to this threshold, and the associated startup-alarm is
equal to rising-alarm or rising-or-falling-alarm. After a rising event is generated, another rising event cannot
be generated until the sampled value falls below this threshold and
reaches the falling threshold. You must specify the rising threshold
as an integer.

To configure the falling threshold or rising threshold,
include the falling-threshold or rising-threshold statement at the [edit snmp rmon alarm index] hierarchy level:

[edit snmp rmon alarm index]
falling-threshold integer;
rising-threshold integer;

integer can be a value from
-2,147,483,647 through 2,147,483,647.