code: def add_reserved_switch_binding(switch_ip, state):
      
  
      # overload port_id to contain switch state
      add_nexusport_binding(
          state,
          const.NO_VLAN_OR_VNI_ID,
          const.NO_VLAN_OR_VNI_ID,
          switch_ip,
          const.RESERVED_NEXUS_SWITCH_DEVICE_ID_R1)
docs: Add a reserved switch binding.