What i was asking is full ISSU, even with micro code. I assume between Major release there will be microcode upgrade most of the time.
On Fri, Nov 9, 2012 at 2:48 AM, Phil <[email protected]> wrote: > The major vendors have figured it out for the most part by moving to > stateful synchronization between control plane modules and implementing > non-stop routing. > > ALU has supported ISSU on minor releases for many years and just added > support for major releases. > > The Cisco Nexus ISSU works well, I've done an upgrade on a 5K switch and > it was completely hitless. > > Juniper and Cisco with the 9K have gone through some hurdles but ISSU is > actually usable now if the software versions support it. > > The main remaining hurdle is updating microcode on linecards, they still > need to be rebooted after an upgrade. > > Phil > > On Nov 8, 2012, at 6:22 PM, Kasper Adel <[email protected]> wrote: > > > Hello, > > > > We've been hearing about ISSU for so many years and i didnt hear that any > > vendor was able to achieve it yet. > > > > What is the technical reason behind that? > > > > If i understand correctly, the way it will be done would be simply to > have > > extra ASICs/HW to be able to build dual circuits accessing the same > memory, > > and gracefully switch from one to another. Is that right? > > > > Thanks, > > Kim >
