Spanning Tree (STP) - Datasources available? in Ask the Community Posted August 1, 2020 The main metric you would care about is related to time since last TCN per VLAN. I have a DS that will get this for the default VLAN, but had a lot of trouble with any others due to lack of context support in LM. I have been told there is context support in the 28.500 collector and later, but have not yet had a chance to test. I published what I have for now as 969G49, but the new version will have to be done as a Groovy script to leverage the context feature.