[Idr] draft-keyupate-idr-bgp-prefix-sid-00 & VPN

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Hi authors,

Please find below 2 questions/comments regarding VPN applicability

1) Carrier's Carrier (CsC)
In IP VPN CsC, both the customer/CEs and the Service Provider/PE use labelled BGP routes (respectively 3107, 2547) for the same IP NLRI.
How does the draft handle this? as both usage of the SID attribute are likely to interfere (especially since both ASes will likely start their SID number from 1, hence collision is very likely).

May be adding, in the attribute, the AFI/SAFI of the SID may help.

2) SID allocation
Would SID be allocated per AS or per PE?
The former would waste the SRGB space (as 1 VPN prefix would burn a SRGB/label entry on _all_ PEs).
The latter would create SID/label collision on option B ASBR (SID 1 allocated on PE1 would collide with SID 1 allocated on PE2)

Thanks,
Regards,
Bruno 

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