[c-nsp] upgrading stack of 3750E's

[Tony Varriale]

The auto upgrade part just is simply not true 100%.

You can load the software and not reboot as well as ignore version 
mismatches.

Yes, there will be downtime due to a reboot.  There is no ISSU.

tv
----- Original Message ----- 
From: "Chris Gauthier" <chris at k7sle.com>
To: "Holemans Wim" <wim.holemans at ua.ac.be>
Cc: <cisco-nsp at puck.nether.net>
Sent: Friday, January 30, 2009 3:50 PM
Subject: Re: [c-nsp] upgrading stack of 3750E's


> We just looked at the 3750E series and bough some because of the 
> stackability. According to Cisco engineers I talked to and a local CCIE, 
> you cannot upgrade the stack in multiple stages. I am told that upgrding 
> the master switch will autmatically upgrade the othes switches at the same 
> time. No matter what, there will be downtime.
>
> *sigh*
>
> Chris
>
> ----- Original Message ----- 
> From: "Holemans Wim" <wim.holemans at ua.ac.be>
> To: cisco-nsp at puck.nether.net
> Sent: Monday, January 26, 2009 1:48:32 AM GMT -08:00 US/Canada Pacific
> Subject: [c-nsp] upgrading stack of 3750E's
>
> We are testing the following setup :
>
> 65XX-VSS - etherchannel - 3750E stack (2 switches) - teaming enabled
> servers
>
>
>
> This should give maximal uptime, overriding defects on the router or
> 3750E switches. We intend to use these switches in L2 mode only,
> managing them via the mgmt fa0 interface.
>
>
>
> I'm now looking into the upgrading procedure for the stack, but I can't
> seem to find a way to do an upgrade in which at least of the 3750E's
> stays operational, thus minimalizing down time. As far as I can tell
> from the doc, there is no way to upgrade e.g. the master switch, have it
> reload (keeping the second switch operational), and after the master
> becomes operational, (auto-)upgrade the second switch. Am I missing
> something or is this scenario really not possible ?
>
>
>
> Another scenario would be removing the switch from the stack (after
> bringing down all ports first via console), changing the ip address of
> the switch, bringing the mgmt port back online, do the upgrade, bring
> the power down, reconnect it to the stack and the power up it again.
> Given the fact that the stack cables are rather fragile, this doesn't
> seem the right way to do, unless it is possible to shut down the stack
> ports by a CLI command ?
>
>
>
> Anyone suggestions, pointers to alternative upgrade procedures,...
>
>
>
> Thanks,
>
>
>
> Wim Holemans
>
>
>
> Network Services University of Antwerp
>
> Netwerkdienst Universiteit Antwerpen
>
>
>
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