You can use the cf takeover and cf giveback commands to make changes to interface groups in the HA pair in a nondisruptive manner.
Changes to the /etc/rc file require a reboot to make the changes effective. You can use the cf takeover and cf giveback commands to take over one node in the HA pair, causing it to reboot while its storage is taken over by the partner.
See the Data ONTAP Network Management Guide for 7-Mode for more information about configuring interface groups.
The node on which the changes were made reboots and its /etc/rc file is reread. The rc file is responsible for creating the interface groups.