[c-nsp] 4500X in VSS - Upgrading IOS XE

Garrett Skjelstad garrett at skjelstad.org
Tue Apr 5 18:35:49 EDT 2016

Why would you need to disconnect the VSS link? We've upgraded them
successfully from 3.6 to 3.7 without disconnecting the VSS links and
reloading them individually.

On Tue, Apr 5, 2016 at 2:22 PM, CiscoNSP List <CiscoNSP_list at hotmail.com>

> Hi Everyone(Sent this to the list yesterday, but it still hasnt shown up?
> So re-sending),
> I need to upgrade IOS XE on a pair of 4500X's...Id prefer not to try/use
> ISSU, as they are remote switches and in production....so Im hoping someone
> has performed an upgrade on these boxes(In VSS) and can provide some
> guidance on a method that "works" :)
> Ive read where people disconnect the VSS link (Or shutdown those ports),
> and perform the upgrade on the 2 switches, then reconnect VSS....but could
> you do something like this:
> conf reg on both switches is already set to 0x2102, so the switches should
> honour the bootvar variables
> copy new IOS XE to bootflash & slavebootflash
> update boot var to point to new XE image
> boot system flash bootflash:xxx
> wr mem and check bootvar is updated
> and reload both switches:
> redundancy reload shelf
> This should reload both switches, and they should come up with the new
> image, and VSS should re-establish?
> Thanks in advance for any advice/recommendations
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