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Whats so difficult about ISSU

Cisco Nexus platform does it pretty well so they have achieved it. 

On Nov 8, 2012, at 3:22 PM, Kasper Adel wrote:

> Hello,
> We've been hearing about ISSU for so many years and i didnt hear that any
> vendor was able to achieve it yet.
> What is the technical reason behind that?
> If i understand correctly, the way it will be done would be simply to have
> extra ASICs/HW to be able to build dual circuits accessing the same memory,
> and gracefully switch from one to another. Is that right?
> Thanks,
> Kim