[c-nsp] IOSXR upgrade procedures Was: 6500, 7600 or ASR

[Saku Ytti]

On (2013-09-13 10:09 +0200), Adam Vitkovsky wrote:

> Regarding the ISSU I heard there's a plan to run something like two codes on
> the LC asics so that one can be upgraded while the other sill performs the
> forwarding duties. 

Interesting. I wonder if they do this in NPUs like EZ and nPower, where
you'll have lot of PPE cores.
I guess you could upgrade each PPE core one by one having very marginal
effect on overall platform performance during the process.

But even then, I suppose there are some controllers/dispatchers which are
SPOF, and if they are offline, NPU can't do work.

I also assume that on ASIC style devices having ASIC offline, would mean
some ports can't do work, I don't think they have parallelism?

But I'm not personally holding breath on seeing true ISSU, which I define
as guaranteed <50ms stopping to forwarding (it's still whole lot of frames
in 100GE)

-- 
  ++ytti