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RMON Alarms
An RMON alarm
identifies:
- A specific MIB object that is monitored.
- The frequency at which it is sampled.
- The method of sampling.
- The thresholds against which the monitored values are
compared.
An RMON alarm can also identify a specific eventTable entry to be triggered when a threshold is crossed.
Configuration and operational values are defined
in alarmTable in RFC 2819. Additional operational values
are defined in Juniper Networks enterprise-specific extensions to alarmTable (jnxRmonAlarmTable).
This topic covers the following sections:
alarmTable
alarmTable in the RMON MIB allows you
to monitor and poll the following:
- alarmIndex—The index value for alarmTable that identifies a specific entry.
- alarmInterval—The interval, in seconds,
over which data is sampled and compared with the rising and falling
thresholds.
- alarmVariable—The MIB variable that is
monitored by the alarm entry.
- alarmSampleType—The method of sampling
the selected variable and calculating the value to be compared against
the thresholds.
- alarmValue—The value of the variable during
the last sampling period. This value is compared with the rising and
falling thresholds.
- alarmStartupAlarm—The alarm sent when the
entry is first activated.
- alarmRisingThreshold—The upper threshold
for the sampled variable.
- alarmFallingThreshold—The lower threshold
for the sampled variable.
- alarmRisingEventIndex—The eventTable entry used when a rising threshold is crossed.
- alarmFallingEventIndex—The eventTable entry used when a falling threshold is crossed.
- alarmStatus—Method for adding and removing
entries from the table. It can also be used to change the state of
an entry to allow modifications.
 |
Note:
If this object is not set to valid, the
associated event alarm does not take any action.
|
jnxRmonAlarmTable
The jnxRmonAlarmTable is a Juniper Networks enterprise-specific
extension to alarmTable. It provides additional operational
information and includes the following objects:
- jnxRmonAlarmGetFailCnt—The number of times
the internal Get request for the variable monitored by this
entry has failed.
- jnxRmonAlarmGetFailTime—The value of sysUpTime when an internal Get request for the variable
monitored by this entry last failed.
- jnxRmonAlarmGetFailReason—The reason an
internal Get request for the variable monitored by this entry
last failed.
- jnxRmonAlarmGetOkTime—The value of sysUpTime when an internal Get request for the variable
monitored by this entry succeeded and the entry left the getFailure state.
- jnxRmonAlarmState—The current state of
this RMON alarm entry.
To view the Juniper Networks enterprise-specific
extensions to the RMON Events and Alarms and Event MIB, see www.juniper.net/techpubs/software/junos942/swconfig-net-mgmt/mib-jnx-rmon.txt .
For more information on the Juniper Networks enterprise-specific
extensions to the RMON Events and Alarms MIB, see Interpreting the Enterprise-Specific RMON Events and Alarms MIB.
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