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

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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.

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...).
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.

Regards,
--Bruno

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