I have a Cisco 7507 chassis with two RSP4+ processors, equipped with 1 VIP4-50. The 7507 is running 12.3(15)feature set IP PLUS IPSEC 3DES. I want to upgrade to 12.3(18) with the same feature set. The new image has been already installed on disk0 on both master and slave processors.
What is the correct precedure for IOS upgrade? Do I have to upgrade slave processor firstly? Do I have to change also rsp-boot image on both master and slave bootflash (now I have 12.3(3) RSP boot image)?