Dell Force10 S2410-01-10GE-24P SFTOS Configuration Guide - Page 77

2 [no] rmon alarm 1-65535 SNMP_OID 5-3600 {delta | Global Config absolute} rising-threshold 0-4294967295 index falling-threshold 0-4294967295 index [owner string] 3 show rmon alarms brief Privileged Exec Identify the event ID created in Step 1 for which you want to set [or disable] an alarm, identify the target MIB, and configure the parameters that trigger the alarm. Display a summary of the contents of the RMON Alarm Table. The event variables are: • 1-65535: An arbitrary number to be used to refer to this event in the Index • log: Create an entry in the log table. Default none • trap:SNMP community used if a trap is to be sent (default: public) • description: Comment describing this entry, • owner: Entity that configured this entry, Figure 4-47. RMON Event Thresholds Figure 4-47, above, depicts the points at which RMON threshold alarms are triggered. The first concept is that an event occurs when a threshold is crossed - either crossing a rising threshold or crossing a falling threshold. The other main concept is that a second event of that type cannot occur until the opposite threshold has been crossed in order to end the period of the first event. In setting the alarm, you must choose between absolute and delta: • absolute - This is an actual value of the selected MIB variable. This choice is better for rate measurements that vary plus or minus. For example, if a value never falls, the falling threshold will never be reached, and the rising threshold will only be crossed once. • delta - This choice is best with counters that only increment. The previous value of the MIB variable is subtracted from the current value to determine whether the value is incrementing from its previous value by the Rising Threshold amount, or by an amount equal to or less than the Falling Threshold amount. Management | 77