Hi Les,

When talking about SID conflicts I think the document should spell out what it 
means by SID.

Indeed, the architecture document defines SID as:
"SID: a Segment Identifier.  Examples of SIDs are: a MPLS label, an
   index value in a MPLS label space, an IPv6 address.  Other types of
   SIDs can be defined in the future."
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-08#section-2


Indeed, when talking about SID conflicts
- it matters that we do not compare apple and orange i.e.  MPLS labels and 
index in SRGB.
- we can't compare index from different protocols (e.g. OSPF & IS-IS) unless 
they advertise the same SRGB (which is only a specific case).


So either the document considers that a SID is an "index" and in this case, we 
just can't compare them across protocols.
Or it consider that a SID is a "MPLS labels" and in this case, as the IGP 
advertisement typically advertise index for global SIDs, there is a need to 
maps the received SID advertisement into the SRGB of the local node.

This needs to be crystal clear.

Thanks
-- Bruno


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