I'm trying to create a filter to act upon the alert condition of an interface going down. I only care about interfaces that go down, when those interfaces are on our switches in the Core and Distribution layers. We have populated the NodeGroup property with the layer that the switch works at:
Core
Distribution
DataCentre Access
User Access
I want to add an alert condition that says "only trigger the alert if the NODEGROUP property doesn't contain 'access'"
When creating the filter, I cannot see the option for NodeGroup under NetworkNode>NodeDetails (see attached)
Is that field known under a different name, or do I have to achieve this with Custom Properties (don't want to duplicate the information) 
Thanks
Dave