check current port
$GRID_HOME/bin/srvctl config scan_listener
SCAN Listener LISTENER_SCAN1 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN2 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN3 exists. Port: TCP:1521
--change port
$GRID_HOME/bin/srvctl modify scan_listener -p 8003
--change remote listener parameter
alter system set remote_listener='
--restart scan_listener
$GRID_HOME/bin/srvctl stop scan_listener
$GRID_HOME/bin/srvctl start scan_listener
--confirm change
$GRID_HOME/bin/srvctl config scan_listener
SCAN Listener LISTENER_SCAN1 exists. Port: TCP:8003
SCAN Listener LISTENER_SCAN2 exists. Port: TCP:8003
SCAN Listener LISTENER_SCAN3 exists. Port: TCP:8003