How to upgrade an IRF stack – incompatible firmware
When upgrading HP Comware switches that are part of an IRF stack, you want to use In Service Software Upgrade (ISSU). This allows you to do a rolling upgrade of the firmware while limiting the impact to just 1 switch in the stack. ISSU will reboot 1 switch in the stack, wait for it to come back up and then moves on to the next switch. Types of ISSU There are 3 types of ISSU:...