@abc.abstractmethod
  def identifiers(self):
    pass
Test handling of a VXLAN NexusMissingRequiredFields exception.
dataset/ETHPy150Open scottrice/Ice/ice/persistence/backing_store.py/BackingStore.identifiers--crossover with--dataset/ETHPy150Open openstack/networking-cisco/networking_cisco/tests/unit/ml2/drivers/cisco/nexus/test_cisco_mech.py/TestCiscoPortsV2.test_nexus_missing_vxlan_fields