Device Missing Alarm Handling

Author: Yanjun Wang

Device Missing Alarm from the IDMS is to alert users that a trap was received and processed which referenced an unknown child network element. Unknown meaning there is no such child element under the particular controller in the SNMP-Manager knowledgebase. (this alarm can be assigned to the controller level at this stage depending on the trap rule)

The purpose of Device Missing Alarm is informing IDMS users to investigate if a new network element was loaded onto the controller but the Errigal IDMS Knowledge-base was not updated with this information.

• In trap specific trap rule
• Based on the IP address with the trap, identify controller in the knowledgebase
• Combine child element name in the trap rule based on the information provided in the trap varbind, and try to find the element per the child name under the controller
• If the child element cannot be found, send a Device Missing Alarm from trap rule to IDMS

• Identify a Device Missing Alarm by checking the Alarm Name on a General Trap Summary(as above).
• Check the Alarm Identifier, if it's DiscoveredNameMatchingFailed, check the RemoteDiscoveryScript - Topology Discovery script could be an issue with the script
• Login to the remote controller with the Hub IP on General Trap Summary or other tools, verify the element is on the remote side. *If the element is now on the remote controller, it may be a trap issue then, please contact Errigal Support.
• Get the controller name and child element name(equipmentIdentifier) on the General Trap Summary
• Check the child element under the controller on EMS Host Tree or download the spreadsheet of the controller from Excel Loading: Export Hub with Nodes, check if the child element is missing from the knowledgebase.
• Add the missing child element through Excel Loading sheet.
• Clear the Device Missing Alarm in Node Monitor.
• For other issues which are not able to resolve with above steps, could be either trap tule issue or RemoteDiscoveryScript issue.