Polling of SNMP targets in an Enterprise

The EMT 5500 maintains a set of MIB objects for devices in an enterprise network. User’s can establish the SNMP polling profile that the EMT 5500 should use when retrieving the values of various MIB objects on SNMP targets. Each polled SNMP object is separately configurable. User’s can establish thresholds to use when generating alarms on an object. For example, a user can configure a packet error count alarm when monitoring
the traffic through an enterprise switch. If the count is exceeded the EMT 5500 will generate an SNMP alarm to an SNMP console for reporting.

Alarm thresholds can be level or edge triggered. A level triggered alarm occurs each time the polled SNMP variable satisfies the threshold
established. Level triggered alarms are useful when reporting, for example, that a communication link is completely down. In this case the user
would typically want to get repeated alarms (e.g., every 5 minutes) to report this condition until it is cleared.

Edge triggered alarms are useful, for example, when the disk utilization on a computer exceeds a configured threshold. The EMT 5500 will generate
a single alarm when the event first occurs. It will not generate any more alarms unless, of course, the disk utilization drops below the configured threshold. Then the EMT 5500 will clear the alarm.

An example SNMP Alarm configuration showing how a user can control when the EMT 5500 generates alarms based on the percentage of total targets that are in a Down State is as follows:

#Start generating alarms when 5 percent of the network is down

Down_Site_Percentage_Start: 5

#Stop generating alarms after 20 percent of the network is down

Down_Site_Percentage_End: 20

#Report a new alarm with each 2 percent increase in down targets

Down_Site_Percentage_Interval: 2

#Send an alarm every 5 minutes until this condition is cleared

Trap_Frequency: 600

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