code: def _delete_nxos_db(self, unused, vlan_id, device_id, host_id, vni,
                          is_provider_vlan):
          
          try:
              rows = nxos_db.get_nexusvm_bindings(vlan_id, device_id)
              for row in rows:
                  nxos_db.remove_nexusport_binding(row.port_id, row.vlan_id,
                                      row.vni, row.switch_ip, row.instance_id)
          except excep.NexusPortBindingNotFound:
              return
docs: Delete the nexus database entry.
  
          Called during delete precommit port event.