Re: [Roll] [MBONED] core/mboned/roll: (which) multicast routing proto/implementations for rfc7390 ff05::fd ?

[Adding manet and babel.]

On April 29, 2022 at 8:29:33 AM, Toerless Eckert (tte@cs.fau.de) wrote:

Sorry for cross-posting, but this is one of those (set of) question(s) that
likeley need it.

RFC7390 (and its -bis draft) define CoAP discovery via ASM IP Multicast
request/reply
on ff0x::fd, with link-local (ff02::fd) for LANs and ff05::fd (Admin Scope)
for L3 networks.

I am wondering what insight we have about actual use of the L3 version via
ff05::fd:

- What multicast routing protocols do those networks use this type of
resource discover ?
- Specifically wireless mesh networks ?
- Specifically 802.15.4 wireless mesh networks ?
- How many / which known 802.15.4 implementation do or do not support
rfc7731 ?

Any insight welcome!

Background: In anima, two drafts are planning to rely on this ASM IP
multicast method,
(draft-ietf-anima-constrained-{voucher,join-proxy}) and i have no good
insight whether
it is prudent to expect that the mayority of target deployment would be
able to
support this ASM IP multicast routing, or whether we would (worst case)
create standard
RFC that will not be adopted purely because one dependency (ASM IP
Multicast routing
for ff05::fd) fails to become supportable well enough in the target
networks.

And my concerns stems from a range of experiences in challenges with
getting ASM IP
multicast adopted in non-wireless-mesh networks, rfc8815 is one example
(not directly
applicable here), rfc8766 and draft-ietf-dnssd-advertising-proxy are actual
IETF work
also in response to the challenges with ASM IP multicast.

But, as said, no direct experience with routed wireless mesh networks such
as 802.15.4,
although i seem to remember that i was previously told by folks from ROLL
that MPL
(rfc7731) was also not commonly supported in implementations.

Cheers
Toerless

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