Dear Authors,

Thanks for this short, clean, document. I have no nits (!!) and only one 
substantive comment to discuss.

In Figures 2 and 3, you annotate all the sub-TLVs from the relevant OSPFv2 and 
OSPFv3 registries, to indicate whether those sub-TLVs are, or are not, 
applicable in the context of the L2 Bundle Member Attribute Sub-TLV. It seems 
to me that it would be helpful to update the registries themselves, to add a 
column with this information. In addition to making the information easier to 
find, it would also reduce the risk of future document authors forgetting to 
specify this information. (It’s all very well for your spec to say that future 
documents MUST supply this information, but such mandates on future document 
authors are hard to enforce consistently, absent some process. Updating the 
IANA registry would provide that process.)

Related, the OSPFv3 registry now has three additional code points, beyond those 
you annotate. I guess you should update Figure 3 to specify Y/N for code points 
30-32.

Thanks,

—John


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