[c-nsp] ISSU on SXF -> SXI

Jason Shearer jshearer at amedisys.com
Fri Feb 12 07:20:50 EST 2010

It is my understanding that ISSU will be supported for the same feature set in the same dev line.

IE - Will work going from SXI to SXI3 but will not work going from SXI to SXJ. (I know J doesn't exist yet).

Is this how everyone else understands ISSU?  Any other known restrictions?


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Phil Mayers
Sent: Friday, February 12, 2010 3:57 AM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] ISSU on SXF -> SXI

On 02/11/2010 07:48 PM, Randy McAnally wrote:
> Thanks for that information.
> What is the 'least problematic' method, step by step, to upgrade from SXF to
> SXI since I have dual sups?  I can handle a single reboot but don't want to
> whack any config or cause the sups to lose redundancy or need multiple or
> extended downtimes.

Load the firmware onto both sup, change the boot statement, reload the
standby sup and it will come up in RPR mode. Force a switchover, the new
sup will finish booting & reload the linecards.

We do this for almost all our software upgrades, and the outage it
typically in the region of 90 seconds. There's nothing special in this
regard about going to SXI - this is how we did it.

It's worth noting that AFAICT ISSU requires the linecards to have
sufficient RAM to pre-load the new IOS image, and many standard
linecards e.g. 6748-SFP/DFC-3B do not, and will therefore not do a
"fast" ISSU. It's also relevant that for ISSU the old and new images
have to be "compatible" and I have my doubts how often that will be the

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