Foundry NetIron M2404C and M2404F Metro Access Switches
Troubleshooting and Monitoring (Rev. 03)
Periodic Monitoring
© 2008 Foundry Networks, Inc.
Page 27 of 55
Any or all of these actions can be assigned to an alert status. Alert behavior can be configured
globally for all monitored indicators, or individually for specific indicators.
How Alerts are Triggered
There are two types of monitored indicators:
•
Pass/Fail conditions
: Are fans working? Is the power supply working? The monitor
function returns a simple Pass or Fail status for power and fans. When alert notification is
enabled, alerts are triggered when the status is Fail.
•
Measured values
: What is the temperature? The monitor function returns actual measured
values for the temperature. The
limit
and
delta
commands in Monitoring Configuration
mode are used to define alert notification triggers for these indicators.
Limit-based Alert Triggering
A reference value can be set for the temperature or port indicator by using the
limit
command in
Monitoring Configuration mode. The user can set the condition that alerts will be generated only
on the instance that the measured value rises above this reference, or only when it drops below this
reference, or when it crosses the reference in either direction. For example, if the user sets alerts to
be triggered when the measured value crosses the limit of 5 in either direction:
1.
An alert is triggered when the last measurement was 4 and the latest measurement is 6.
2.
No new alerts are triggered as long as measurements remain above 5.
3.
An alert is triggered when the measured value falls back below 5.
When the limit command is used alone, alerts are triggered only when the measured value crosses
the limit value. The
delta
command in Monitoring Configuration mode can be used to configure a
range of alert triggers relative to the limit value.
The
delta
command configures a scale centered on the limit value. The value of the
delta
command <
difference
> variable determines
delta points
, which are points located along the scale
on both sides of the limit value at distances that are whole multiples of <
difference
>:
… | <
difference
> | <
difference
>
limit
<
difference
> | <
difference
> | …
-or
-
…, [limit – 2
x
(difference)] , [limit - difference] ,
[limit] ,
[limit + difference] , [limit + 2
x
(difference)], …
Alerts are triggered when the measured value crosses a delta point. For example, if the limit is 55
and <
difference
> is 3, alerts may be generated when the value crosses any of these values:
…46, 49, 52,
55
, 58, 61, 64…
The trigger values differ from the limit value 55 by whole multiples of the <
difference
> value, in
this case 3.
For
temperature
monitoring, the limit value is interpreted as degrees Fahrenheit or Celsius,
depending on the scale selected for monitoring.
Periodic Monitoring Default Configuration
Table 13
shows the periodic monitoring default parameter values.