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

[<[e-mail]>]

Hi authors,

Some routes may be received unlabeled (from untrusted sources) and redistributed as labeled. e.g. IPv6 → 6PE, IP --> VPN IP
How would the AS protect itself (from SID collision) from non labeled/trusted  routes received with a SID attributes, and then re-advertised as labelled?

"   A BGP speaker receiving a BGP Label index attribute from its EBGP
   neighbor SHOULD discard the attribute unless it is configured to
   accept the attribute from the EBGP neighbor."

Is good but may not be sufficient as the above BGP speaker (ASBR) may not support this document and hence will propagate the attribute over iBGP sessions. (unless we require that all routers support this document in which case we may not need a transitive attribute, which would by itself address the problem)

One option would be to mandate that by default a BGP session/peer group/AFI remove the received SID attribute. (or at least do not honor it, but I don't see the use case to keep the attribute that we don't want to use)
 e.g. something like "To contain distribution of the BGP
   Label Index attribute beyond its intended scope of applicability,
   attribute filtering MAY be deployed."

But for _received_ routes and with :s/MAY/SHOULD.

At least the currently empty security consideration section should probably discuss this.

Thanks,
Regards.
Bruno

PS: On a side note "Segment Routing Architecture" should probably be a normative reference.

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