[lisp] "Update RFC6833bis" header when a meaning is associated with a reserved bit

[<[e-mail]>]

Hi all,

In a discussion among the authors of draft-ietf-lisp-pubsub, we discussed whether an "Update RFC6833bis" header is needed to be added to the draft.

The rationale is the -bis document states, for example, the following:

   R: This reserved bit MUST be set to 0 on transmit and MUST be ignored
      on receipt.

So, obviously this behavior is to be updated each time a meaning is associated with an unassigned/reserved bit, otherwise an extension will be broken if that part of the -bis spec is not touched on.

An update header is therefore more than appropriate....nevertheless, it seems that some old RFCs didn't follow this approach (e.g., RFC8061).

The question we have for the WG is which option do we need to follow: update or no update?

FWIW, a similar action is needed for other documents, e.g., draft-ietf-lisp-mn.

Thank you.

Cheers,
Med