1. Login to management console using SSH
2. Show the current IP address setting using following command
show network-parameter
3. Change IP address of controller A using following command
set network-parameters ip <IP_ADDRESS> netmask <NETMASK> gateway <GATEWAY> controller a
4. Restart controller A
restart mc a
5. Change IP address of contoller B using following command
set network-parameters ip <IP_ADDRESS> netmask <NETMASK> gateway <GATEWAY> controller b
6. restart controller B
restart mc a