I know this is an awful answer, but just don't do ISSU on them. ????
Most of my experiences come from quad Sup8s in the same chassis. We have
been running 3.11.1 for the past 49 weeks, since our last cycle, which is
12/18 months.
The biggest ISSUe (lol) with it, is just the sheer number of jumps back and
forth as you climb the ISSU ladder from a historic release. We have also
found it to be beneficial to do a pre-ISSU supervisor restarts for each
supervisor prior to actually doing the upgrade so as to lessen the chance
of getting 'stuck' in a ISSU-loop with a hung Supervisor. The fact that
4500 sups sit in a 'cold' mode when doing the jumps just adds to the delay,
6500s/6800s are MUCH nicer for this action in the fact they are
'warm(hot?)' and already booted.
A full cold restart of the shelves takes approximately 23 minutes per our
lab units. We have found in some locations that have tolerable maintenance
windows, to load/prep and simply cold start the shelves, instead of a
weeklong of ISSU maintenance windows. Of course, if you patch every 60-120
days as the cadence of each release, perhaps it's more manageable. I read
there are some additional protections and time optimizations in later
rommon versions, but for our use, we just haven't seen the need for a
seperate out of cycle ROMMON patches. We are currently looking at simply
replacing them with Catalyst 9k models.
The 4500-Xs run the same supervisor set and are just as friendly, although
contending with only duals vs quads.
Obviously out-of-band management on all supervisors is a necessity.
YMMV, good luck!
-Garrett
On Fri, Mar 12, 2021 at 12:27 PM Eli Kagan via cisco-nsp <
cisco-nsp@puck.nether.net> wrote:
>
>
>
> ---------- Forwarded message ----------
> From: Eli Kagan <e.kagan@yahoo.com>
> To: "cisco-nsp@puck.nether.net" <cisco-nsp@puck.nether.net>
> Cc:
> Bcc:
> Date: Fri, 12 Mar 2021 20:25:01 +0000 (UTC)
> Subject: Cisco Cat4500 Quad Sup VSS ISSU IOS Upgrade
> Hi all,
>
> I have a rather old Cat4507R+E pair, running on four Sup7e as a VSS,
> IOS-XE version 3.8.8E.
>
> I'd like to understand what's the right way of doing an ISSU on a quad sup
> system. I am planing to go to version 3.8.10E unless someone has a better
> suggestion.
>
> Sharing your first hand experience would be greatly appreciated.
>
> Thanks,
> Eli
>
>
>
> ---------- Forwarded message ----------
> From: Eli Kagan via cisco-nsp <cisco-nsp@puck.nether.net>
> To: "cisco-nsp@puck.nether.net" <cisco-nsp@puck.nether.net>
> Cc:
> Bcc:
> Date: Fri, 12 Mar 2021 20:25:01 +0000 (UTC)
> Subject: [c-nsp] Cisco Cat4500 Quad Sup VSS ISSU IOS Upgrade
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