Cisco Cat4500 Quad Sup VSS ISSU IOS Upgrade

[Eli Kagan]

Hi all,

I have a rather old Cat4507R+E pair, running on four Sup7e as a VSS, IOS-XE version 3.8.8E.

I'd like to understand what's the right way of doing an ISSU on a quad sup system. I am planing to go to version 3.8.10E unless someone has a better suggestion.
 
Sharing your first hand experience would be greatly appreciated.
 
Thanks,
Eli