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

[Tim Stevenson]

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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