[j-nsp] upgrading a ex4550 VC to 15R1.8 using non-stop-upgrade

[Simone Spinelli]

Thank you Peter,

now it's clear: we shouldn't have done it ... :)
But we need that release to support some non-juniper optics.
As soon as we have new hardware we will test a step-by-step upgrade.

Best Regards
Simone

On Wed, Sep 23, 2015 at 11:11 PM, Peter Tavenier <petertavenier at gmail.com>
wrote:

> > On 23 Sep 2015, at 14:48, Simone Spinelli <simone.spinelli at gmail.com>
> wrote:
> >
> > Hi all,
> >
> > few days ago we upgraded a 6 members VC of ex4550 from 12.3R6 to 15R1.8.
> > using nssu precedure.
> > We have linjux boxes connected with LACP on different member.
> > We checked all the requirement listed on:
> >
> http://www.juniper.net/techpubs/en_US/junos14.2/topics/task/installation/ex-series-software-upgrading-nssu-fixed-virtual-chassis-cli.html
> >
> > After we started the upgrade , all the LACP links  went down (one by one
> > depending on the upgraded member), even if linecards were up and running
> > and connected to the VC.
> > In the end, everything went back to normal when the master RE came up.
> > Actually a member was still stuck with all the LACP ports in "detached"
> > state: after a manual reboot, it went ok.
> >
> > Did anybody have a similar issue?
> > Any suggestion for investigation?
>
> Hi Simone,
>
> If you see
> http://www.juniper.net/techpubs/en_US/release-independent/junos/topics/reference/general/ex-series-nssu-support-tables.html#ex4200-4500-vc
> and then the PR1030508 you see there were some issue’s with this 12.3R6
> release, so not sure if you hit that.
>
> However even if you don’t use NSSU I think this upgrade path (did you
> upgrade directly to 15R1.8?) is not supported[1]
>
> "Support for upgrades and downgrades that span more than three Junos OS
> releases at a time is not provided, except for releases that are designated
> as Extended End-of-Life (EEOL) releases.”
> and
> "You can upgrade or downgrade to the EEOL release that occurs directly
> before or after the currently installed EEOL release, or to two EEOL
> releases earlier or later.”
>
> - JunOS 12.3 is an Extended End of Life (EEOL) Release[2]
> - JunOS 13.3 and 14.1 are also EEOL.
> So you could upgrade form 12.3 to 14.1 (I’m not sure if ISSU is supported
> in this path as well).
>
> [1]
> http://www.juniper.net/techpubs/en_US/junos15.1/information-products/topic-collections/release-notes/15.1/topic-83365.html#rn-junos-ex-migration-upgrade-downgrade
> [2] http://www.juniper.net/support/eol/junos.html
>
> --
> Peter
>