[Idr] Possibility of empty Link Descriptors in BGP-LS?

[Nandan Saha <[e-mail]>]

Hi folks,

I'm wondering whether some text needs to be added to
https://tools.ietf.org/html/draft-ketant-idr-rfc7752bis-01#section-4.2.2
for the case where neither the ipv4/6 address sub tlvs nor link/remote
identifiers are present in the IGP's LSP/LSA.
For IS-IS specifically, it seems to me that an IS-IS implementation
(in a non-TE) scenario is free to leave out the ipv4/6
interface/neighbor address sub-tlvs based on
https://tools.ietf.org/html/rfc5305#section-3.2, and
https://tools.ietf.org/html/rfc5305#section-3.3. The link/remote link
identifiers also appear optional.

In such a case, the link descriptor in the link nlri will be empty
which is problematic in the case where there are multiple links
between 2 nodes as there's no way to distinguish between the different
links.

Thanks,
Nandan