code: def get_reserved_bindings(vlan_id, instance_id, switch_ip=None,
                            port_id=None):
      
      LOG.debug("get_reserved_bindings() called")
      if port_id:
          return _lookup_all_nexus_bindings(vlan_id=vlan_id,
                                            switch_ip=switch_ip,
                                            instance_id=instance_id,
                                            port_id=port_id)
      elif switch_ip:
          return _lookup_all_nexus_bindings(vlan_id=vlan_id,
                                            switch_ip=switch_ip,
                                            instance_id=instance_id)
      else:
          return _lookup_all_nexus_bindings(vlan_id=vlan_id,
                                            instance_id=instance_id)
docs: Lists reserved bindings.