[j-nsp] qfx5100 software upgrades and virtual-chassis

Nitzan Tzelniker nitzan.tzelniker at gmail.com
Thu Sep 6 14:11:44 EDT 2018

If you cant afford taking down the whole VC do not work with VC
This is my philosophy with VC
Do MC-LAG or EVPN in these environment (even with VC just to increase the
number of ports )

Regarding the host they dont have to be the same unless there is a known


However, pay attention to these notes regarding Junos OS and Host OS


   The Junos OS and Host OS versions do not need to be the same.

   During an ISSU, the Host OS cannot be upgraded.

   Upgrading the Host OS is not required for every software upgrade, as
   noted above.


On Thu, Sep 6, 2018 at 8:10 PM Louis Kowolowski <louisk at cryptomonkeys.org>

> It seems reasonable, and no worse than the situation now, with mis-matched
> versions. I don't see why the host software would have anything to do with
> VC, seems like it should just be handling VM operations, and doing
> hardware-passthrough...
> > On Sep 6, 2018, at 12:01 PM, Chuck Anderson <cra at WPI.EDU> wrote:
> >
> > Logically, why couldn't you isolate one member at a time, do the
> upgrade, then rejoin it to the VC?
> >
> > On Thu, Sep 06, 2018 at 11:12:59AM -0500, Louis Kowolowski wrote:
> >> I currently have a 6 node VC of qfx5100. All are running 14.1X53-D43.7
> and host software 13.2X51-D38. In discussions with JTAC, they claim that
> upgrading the host software to match the VM, it requires a reboot of *all*
> nodes in the VC at the same time.
> >>
> >> Has anybody else had to deal with this? Are there any work-arounds?
> Taking the whole thing down is extremely awkward. Can we do a rolling
> upgrade (manually, I know ISSU/NSSU doesn't handle this) and stay
> operational? We are working on a plan to re-architect this into 2x 3 node
> VC and MC-LAG them together, but it would be nice to be able to fix this
> more short-term.
> --
> Louis Kowolowski                                louisk at cryptomonkeys.org
> Cryptomonkeys:
> http://www.cryptomonkeys.com/
> Making life more interesting for people since 1977
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