Re: [Lsr] draft-ietf-lsr-flex-algo

Hi Peter,

Thanks for your reply.

> From: Peter Psenak [mailto:ppsenak@cisco.com]
> 
> Hi Bruno,
> 
> please see inline:
> 
> On 30/06/2020 16:53, bruno.decraene@orange.com wrote:
> > Hi all,
> >
> > I can live with the current text, but I'm just raising the point for discussion
> (better safe than sorry).
> >
> > "16.1.1.  IGP Algorithm Types Registry
> >
> >     This document makes the following registrations in the "IGP Algorithm
> Types" registry:
> >
> >        Type: 128-255.
> >
> >        Description: Flexible Algorithms.
> > "
> > https://tools.ietf.org/html/draft-ietf-lsr-flex-algo-07#section-16.1.1
> >
> > This is essentially burning half of the registry for flex-algo. Indeed, any
> network operator could use any value, e.g. 222, hence the IETF could never
> define a different usage for this value without creating interop issues for the
> network operator.
> 
> what is the real problem? Is the space 2-127 that is free not sufficient
> for other standardized algorithms that may come?
> 
> >
> > We could discuss whether we really need 127 values for this. (i.e. a
> network operator requiring 127 flex algo, typically multiplying its IGP FIB
> entries by 127...).
> 
> above is not necessarily true and more importantly completely irrelevant
> to the number of algos we reserve for FA.
> 
> 
> > We could also discuss whether this range could be change to the IANA well-
> known "Private Use" [1]. This would allow for alternative private usages in
> the future (e.g. Flexible Alorithms v2).
> > [1] https://tools.ietf.org/html/rfc8126#section-4.1
> >
> > It seems to me that the latter would equally work for flex algo, but would
> provide more flexibility :-) for the future.
> 
> I don't think so. We need an allocated range of algos for FA for
> compatibility.

The allocated range of algos for FA would be the same. Just not dedicated to FA.

--Bruno

> 
> thanks,
> Peter
> >
> > Regards,
> > --Bruno
> >
> >
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