[c-nsp] Nexus 7K NX-OS Upgrade

[Dirk Woellhaf]

Hi,

I've seen ISSU disrupting data-forwarding during a CPoC in 2011 but
this was all related to a bug. I have recently updated 4 N7k's from
5.2(3) to 5.2(5) without any problem!

Regards dirk

On Wed, Nov 7, 2012 at 4:20 PM, Tim Stevenson <tstevens at cisco.com> wrote:

> At 06:05 AM 11/7/2012, Pete Templin mused:
>
>  On 11/7/12 6:02 AM, Alexander Lim wrote:
>>
>>  Do you know what caused the 3 secs blip? How can Cisco claims that it is
>>> non-disruptive then?
>>> Thanks for sharing.
>>>
>>
>> From what I've learned from others, the 'install all' unpacks the new
>> files which run the processes, and then the processes are stopped/started.
>>  The blip aligns with the card that's actively being upgraded, as shown by
>> the 'install all' or 'show install all status' if run on another login
>> session/console.
>>
>
>
> There are no software processes that affect hardware/data plane
> forwarding, any process can be statefully restarted without impacting data
> flow (in theory, ignoring bugs). We do claim it is non-disruptive and we
> can easily demonstrate that and have many times.
>
> It is unexpected and not per design to lose data traffic during an ISSU,
> provided you are ISSU'ing to/from supported releases (as per the ISSU
> matrix in the user documentation), all your data traffic is being hardware
> switched, and assuming no software defects (such as the specific one cited
> earlier in the thread).
>
> 2 cents,
> Tim
>
>
>
>
>
>  pt
>>
>>
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>
>
>
>
> Tim Stevenson, tstevens at cisco.com
> Routing & Switching CCIE #5561
> Distinguished Technical Marketing Engineer, Cisco Nexus 7000
> Cisco - http://www.cisco.com
> IP Phone: 408-526-6759
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