[c-nsp] IOS XR

[Mark Tinka]

On Monday, September 05, 2011 11:51:44 PM Jason Lixfeld 
wrote:

> All of our XR upgrades have gone off without a hitch. 
> 4.0 to 4.0.1 and 4.0.1 to 4.1.  All fine.  The only
> issue is that ISSU isn't supported until 4.2 so the
> upgrades aren't hitless :(

Personally, I don't mind the lack of ISSU. There is no way 
I'm going to trust that things will go well even when ISSU 
is supported, so we'll always be running upgrades during 
outage windows, and not using ISSU just to be sure.

The worst thing issue I have with IOS XR upgrades is the 
amount of time it takes to run the patch. Even an SMU can 
take decades, especially if it needs to reload the line 
cards/fabric. It's really annoying - almost 1.5hrs upgrading 
a single box.

But, I hear there are plans to significantly reduce the 
upgrades times in upcoming code. Not sure if you need the 
new RP's or if the current ones will do.

Cheers,

Mark.
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