Re: BFD for vxlan Destination MAC field (was Re: draft-ietf-bfd-vxlan IESG status)

[Greg Mirsky <[e-mail]>]

Hi Jeff, et al.,
attached please find the new working version of BFD over VXLAN and its diff
to -13.
Please let me know if you have any questions.

Regards,
Greg

On Mon, Jul 20, 2020 at 2:26 PM Jeffrey Haas <[e-mail]> wrote:

> On Wed, Jun 17, 2020 at 03:52:14PM -0400, Jeffrey Haas wrote:
> > >> Proposed solution: A MAC value should be chosen that is well known
> and the
> > >> text would become:
> > >>
> > >> "Destination MAC: A Management VNI, which does not have any tenants,
> will
> > >> have no dedicated MAC address for decapsulated traffic.  The value
> > >> X:X:X:X:X
> > >> SHOULD be used in this field."
> > >>
> > >> SHOULD might need to be MUST.  Since a partial motivation for
> permitting
> > >> the
> > >> flexibility in the specification to NOT use the management VNI is
> desired=
> > > ,
> > >> MUST might be inappropriate.
> > >>
> > > GIM>> Accepted the suggested text. I agree that the flexibility to not
> use
> > > the Management VNI is permitted in the specification and thus SHOULD
> in the
> > > text is consistent with that scenario. How would we pick the MAC
> address?
> >
> > I am out of my area of expertise and I was hoping someone in the IESG
> can offer a fix. :-)  I am copying Donald Eastlake since he's the
> designated expert for the IANA MAC address block.
> >
> > Donald, review of the thread may be useful, but tersely the need is to
> have a well known MAC address that can be placed in this vxlan PDU that is
> literally a placeholder of "not to be used for forwarding".  The packet
> arrives at the endpoint and, if not immediately accepted, would be dropped.
> >
> > If there is no well known MAC that could be used for such a behavior,
> perhaps an address from the IANA block may be used?
> >
> > While I suspect the IANA mac documentation range could be used, IANA may
> not appreciate that.
>
> Donald is not responding to emails.  Considering I've been similarly bad
> about responding, that's forgivable.  However, in the interest of advancing
> the document, I'd like to make a proposal.
>
> https://www.iana.org/assignments/ethernet-numbers/ethernet-numbers.xhtml
>
> Proposed text:
>
> : Destination MAC: A Management VNI, which does not have any tenants, will
> : have no dedicated MAC address for decapsulated traffic.  The value
> : [TBD1] SHOULD be used in this field.
> :
> : IANA Considerations:
> :
> : IANA is requested to assign a single MAC address to the value TBD1 from
> the
> : "IANA Unicast 48-bit MAC Address" registry from the "Unassigned (small
> : allocations)" block.  The Usage field will be "BFD for vxlan" with a
> : Reference field of this document.
>
>
>
> -- Jeff
>