Subject: [Idr] Clarifying add-paths capability formatting

From: John Scudder <[email-masked]>
Date: Thu, 10 Dec 2015 23:11:57 +0000

Hi Everybody,

We recently became aware that the add-paths draft could be Even Clearer regarding how the ADD-PATH capability is to be formatted. The authors' intent was that all AFI/SAFI were to be listed within a single capability and most implementations do this, but one implementor recently chose to do it as multiple capabilities each carrying a single AFI/SAFI.

Since it's evidently not sufficiently clear in the current draft, we propose to add this sentence at the end of Section 4. (ADD-PATH Capability):

"A BGP speaker that wishes to indicate support for multiple AFI/SAFI MUST do so by including the information in a single instance of the ADD-PATH Capability."

FYI and comments if any.

Thanks,

--John
  (wearing co-author hat and not co-chair epaulets)