Re: [secdir] Review of draft-ietf-bfd-vxlan-07

[Jeffrey Haas <[e-mail]>]

On Tue, Jun 04, 2019 at 01:40:33PM -0700, Greg Mirsky wrote:
> > Echo BFD is out of scope for the document, but does not describe the
> > reason for this or why state
> > this at all?
> >
> GIM>> I think that the main reason is that the BFD Echo mode is
> underspecified. RFC 5880 defined some of the mechanisms related to the Echo
> mode, but more standardization work may be required.

Speaking as a BFD chair, this is the relevant observation.  BFD Echo is
underspecified to the point where claiming compliance is difficult at best.
In general, it relies on single-hop and the ability to have the remote Echo
client loop the packets. 

This packet loop may not be practical for several encapsulations and thus is
out of scope for such encapsulations.  Whether this is practical for vxlan
today, or in the presence of future extensions to vxlan is left out of scope
for the core proposal.

-- Jeff