In an example aspect, an optical switch provided. The optical switch comprises a plurality of reconfigurable add/drop multiplexers (ROADMs), each comprising a plurality of optical line ports and a plurality of add/drop ports. The optical switch also comprises a connection apparatus connecting, for each ROADM, each add/drop port of the ROADM to a port of each of a respective one or more other ROADMs. In another example aspect, a method of configuring an optical switch is provided.