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Home > Success Center > User Device Tracker (UDT) > UDT - Knowledgebase Articles > Layer 3 polling disabled in UDT

Layer 3 polling disabled in UDT

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Created by Matthew Lamb, last modified by Nigel on Sep 10, 2018

Views: 1,397 Votes: 1 Revisions: 8


This article provides brief information and steps to resolve the issue when the nodes in UDT are disabled for Layer 3 polling under Node Properties.


UDT version 3.2.3 or earlier


This behavior was actually by design within UDT until UDT 3.2.4, when it was disabled. This is because :

  • Layer 3 polling on those nodes is not returning ARP data
  • the polling job has failed several times due to failure to respond on the device
  • there is no support for the ARP data tables in SNMP

These early versions of UDT disabled the layer 3 polling in this event to cut down on the amount of unnecessary polling jobs it was doing to decrease polling impact.

In some cases however, this can be detrimental for layer 3 polling in UDT. Such cases would be when the devices are brought down for maintenance, network outages or any other occurrence that results in the node being inaccessible or reachable by UDT. The same design will not work in reverse in such a regard: the polling will remain disabled even in the event the node returns.

For more information on finding and setting Layer 3 polling, see Verify Level 3 polling in UDT.

To prevent this functionality from occurring, you can upgrade to UDT 3.2.4 or higher where ithas been disabled.



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