nanog mailing list archives
Re: Whats so difficult about ISSU
From: Oliver Garraux <oliver () g garraux net>
Date: Thu, 8 Nov 2012 20:22:20 -0500
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 thatanyvendor 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 tohaveextra ASICs/HW to be able to build dual circuits accessing the samememory,and gracefully switch from one to another. Is that right? Thanks, Kim
Current thread:
- Whats so difficult about ISSU Kasper Adel (Nov 08)
- Re: Whats so difficult about ISSU Zaid Ali (Nov 08)
- Re: Whats so difficult about ISSU Kenneth McRae (Nov 08)
- Re: Whats so difficult about ISSU Alex (Nov 12)
- Re: Whats so difficult about ISSU Kenneth McRae (Nov 08)
- Re: Whats so difficult about ISSU Kenneth McRae (Nov 08)
- Re: Whats so difficult about ISSU Zaid Ali (Nov 08)
- Re: Whats so difficult about ISSU Phil (Nov 08)
- Re: Whats so difficult about ISSU Kasper Adel (Nov 08)
- Re: Whats so difficult about ISSU Kenneth McRae (Nov 08)
- Re: Whats so difficult about ISSU Kasper Adel (Nov 08)
- Re: Whats so difficult about ISSU Oliver Garraux (Nov 08)
- Re: Whats so difficult about ISSU Phil (Nov 08)
- Re: Whats so difficult about ISSU Kasper Adel (Nov 08)
- Re: Whats so difficult about ISSU Jonathan Lassoff (Nov 08)
- Re: Whats so difficult about ISSU Jimmy Hess (Nov 11)
- Re: Whats so difficult about ISSU Pete Lumbis (Nov 09)
- Re: Whats so difficult about ISSU Saku Ytti (Nov 09)
- Re: Whats so difficult about ISSU Pete Lumbis (Nov 09)
- Re: Whats so difficult about ISSU Saku Ytti (Nov 09)