I know some people here have mentioned good experiences with ISSU on Nexus. I don't doubt that it usually works right, but in my latest experience with upgrading NX-OS on dual-SUP'ed 7k's, it was "hitless" if, by "hitless", you mean ~20% packet loss while troubleshooting with TAC before we found that we had to remove and re-apply QoS policies from every interface. Also, depending on the update, linecards might have to be reset. Oliver ------------------------------------- Oliver Garraux Check out my blog: www.GetSimpliciti.com/blog Follow me on Twitter: twitter.com/olivergarraux On Thu, Nov 8, 2012 at 8:00 PM, Kasper Adel <karim.adel@gmail.com> wrote:
Does that mean they are the only vendor capable of doing this today?
I am interested in the technology behind this if this is something public, any ideas?
Thx
On Friday, November 9, 2012, Kenneth McRae wrote:
I have performed micro code upgrades using ISSU on the Juniper platform.
On Thu, Nov 8, 2012 at 4:52 PM, Kasper Adel <karim.adel@gmail.com<javascript:_e({}, 'cvml', 'karim.adel@gmail.com');>
wrote:
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 <bedard.phil@gmail.com<javascript:_e({}, 'cvml', 'bedard.phil@gmail.com');>> 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 <karim.adel@gmail.com<javascript:_e({}, 'cvml', 'karim.adel@gmail.com');>> 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