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

[Greg Mirsky <[e-mail]>]

Hi Jeff,
do you think that the record in the Usage filed for the requested MAC
address instead of "BFD over VXLAN" be more generic, e.g., "Active OAM over
NVO3"?
What do you think?

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
>