best practice for using non-standard listener (with non standard port) ?

Hi All,

What is the best practice for using non-standard listener (with non standard port) ?

I've this setup in my env.

LISTENER                         standard listener (1521)                     -                       disable at srvctl         up at lsnrctl

LISTENER_XXXX              non-standard listener (XXXX)     local_listener           enable at srvctl         up at lsnrctl

LISTENER_SCAN1,2,3      non-standard listener (YYYY)    remote_listener       enable at srvctl         up at lsnrctl

Initially I wanted to keep LISTENER (standard listener (1521)) disable and down but RAC SCAN was not able to function properly.

Can anyone share experience and knowledge what should be done.

Thank you !