[c-nsp] Cisco VSS upgrade - time needed?

Matthieu MICHAUD matthieu at nxdomain.fr
Fri Aug 31 10:50:24 EDT 2012


According my little experience on this (I have done that around 10 times) 2
hours would be enough if carefully planned.
In practice I have done that in half an hour with an actual outage of 15

If you did not already done so I advise you to read these :

I would also strongly recommend you to test the dual active scenario. Other
mailing list members could add it is really unlikely to happen.
They would be right if nobody tests it. But trust me it is not so uncommon
if you have regular DRP exercise.
Right now I can think of at least half a dozen lazy ass (including myself)
convinced that triggering this scenario by shutting down the VSL links is


On Fri, Aug 31, 2012 at 3:46 PM, Bernie <zenbernie at gmail.com> wrote:

> Hello! I'm going to be performing my first upgrade of 2 Catalyst 6500
> chassis to a VSS in a few weeks. There are only FastE and Supe modules
> installed, so I'm thinking my outage window will only need to be 3-4 hours
> (inc. rollback time for problems). Has anyone on the list done this
> conversion and can you confirm my outage time estimate? On a related note,
> what was your personal experience with the actual network outage time
> during reboots?
> Thanks!
> Bernie
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