Allocation of a Global Prefix (Re: I-D Action: draft-ietf-6man-sids-01.txt)

[Bob Hinden <[e-mail]>]

Suresh,

In Section 5.  Allocation of a Global Unicast Prefix for SIDs the draft discussed the use of a dedicated prefix for SR domains.   I think that is an interesting idea, however it then says:

   The SRv6 operational community, which is the first intended user of
   this block, is requested to come up with conventions and guidelines
   for the use of this newly allocated address block in line with their
   requirements.

I think the notion of doing the allocation first and then come up with conventions and guidelines for how to use it is problematic.   I think it needs to be the other way around, as well as probably combining it with the IANA request for a prefix.

I have also been wondering if ULAs could be used for this purpose.   I think they have most of the right properties, that is, not intended for global routing and easily filtered at administrative boundaries.   An SR domain could allocate one or more ULA prefixes.  Or it might be time to define the centrally allocated ULA-C part of the ULA space.

Bob