[c-nsp] IOS XR

[Aaron]

Mikael,
How did you come to 50ms? What application requires such tight timing?

aron

On Tue, Sep 6, 2011 at 01:42, Mikael Abrahamsson <swmike at swm.pp.se> wrote:

> On Tue, 6 Sep 2011, Mark Tinka wrote:
>
>  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.
>>
>
> There is also the question about what "ISSU" is. For me, it should be
> hitless or at least sub 50ms traffic hit. As far as I know, none of the
> router manufacturers come even close to this, even when they're talking
> about the future.
>
> Multiple seconds outage is not "in service".
>
>  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.
>>
>
> Yes, it's a nightmare.
>
>  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.
>>
>
> Well, "significantly" in this case is not the "order of magnitude"
> improvement that I feel is needed to make this good.
>
> --
> Mikael Abrahamsson    email: swmike at swm.pp.se
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