NNMi 9.x : What can cause SNMPLinkUp/Down traps not to be seen on the SNMP trap browser from a managed device

  • KM1351525
  • 25-Mar-2012
  • 30-Jul-2013


For the event when NNMi isn't able to process and display the SNMPLinkUp/Down traps from managed devices, check the status of polling for the interface sending the trap on the managed device and make it polled.


In NNMi (Network Node Manager 9.x version), why SNMPLinkUp/Down traps are not seen on the SNMP trap browser even when the managed device hosting the interface which is sending the SNMPLinkUp/Down trap is managed in NNMi ? 


NNMi will honor SNMPLinkUp/Down traps from managed devices provided that the interface creating these traps on the device is being polled by NNMi. If the interface is not being polled (even when the device hosting the interface is managed and polled), NNMi will not honor traps from such interface.

To confirm if the polling state of the interface is causing traps to be dropped by NNMi, enable tracing to FINEST level on 'events' using :
Windows : %NNMInstallDir%\support\nnmsetlogginglevel.ovpl com.hp.ov.nms.events FINEST
Unix : /opt/OV/support/nnmsetlogginglevel.ovpl com.hp.ov.nms.events FINEST

Once the trap reaches NNMi, the trace file* shows messages like following :

Mar 22, 2012 4:22:57.249 PM [ThreadID:188] FINE: com.hp.ov.nms.events.stages.Resolver run: Interface 2/6 with ifAlias xyz and ifIndex xyz hosted on node xyz is not monitored for fault polling. This snmp trap will be dropped.

Mar 22, 2012 4:22:57.249 PM [ThreadID:188] FINE: com.hp.ov.nms.events.stages.Resolver run: Pipeline data:
Base Configuration Id: <xyz>
Uuid: <xyz>
Id: null
Name: SNMPLinkDown
Severity: Major
Oid: .
Formatted Message: Agent Interface Down (linkDown Trap) on interface $1
Source Node Uuid: <xyz>
Source Node Id: xyz
Source Node Name: xyz
Source Node Long Name: xyz
Source Node Management Address: xyz

* NNM trace file can be found at :
Windows : %NNMDataDir%\log\nnm\nnm-trace.*.*.log
Unix : /var/opt/OV/log/nnm/nnm-trace.*.*.log

In order to see messages in the SNMP trap browser in NNMi, enable 'Interface fault polling' for the interface in NNMi. For more details on 'Interface fault polling', refer to the NNMi Online Help: Help for Administrators from the link below :

Note : By default, any connected interface is monitored for MIB-II ifAdminStatus and ifOperStatus. (ifAdminStatus is set by the device administrator. ifOperStatus indicates the operational status of interface health.) If the network has unconnected interfaces that are sending the SNMPLinkUp/Down traps and there is a need to monitor these interfaces, expand NNMi monitoring behavior with the Poll Unconnected Interfaces and the Poll Interfaces Hosting IP Addresses attributes. More details are given in the Online help mentioned above.

Additional reference : http://support.microfocus.com/kb/kmdoc.php?id=KM765741