code: def get_nexusport_binding(port_id, vlan_id, switch_ip, instance_id):
      
      LOG.debug("get_nexusport_binding() called")
      return _lookup_all_nexus_bindings(port_id=port_id,
                                        vlan_id=vlan_id,
                                        switch_ip=switch_ip,
                                        instance_id=instance_id)
docs: Lists a nexusport binding.