Yes, events are esx.problem.net.vmnic.linkstate.down and esx.clear.net.vmnic.linkstate.up
I've created one rule that generates an error on the "down" event and "resolve" on the "up" event. I'm hoping that will therefore allow these to self-resolve. Sound correct?
Perhaps this should be a Predefined alarm? It's not good if you loose connectivity on a network uplink.
Thanks very much for your help and speedy response (as usual)