Daniele,
Perhaps this will help:
By design, a node that is about to "discover" a domain that it wishes to
join does not care about existing routing that may (or may not) exist in
parallel with it. The only requirement on the node (at least for the
basic ANIMA specification) is that it have a link-local address, and an
appropriate certificate that will permit it to join the domain. The
link-local addressing permits it to "discover" a node that is already a
member of the domain, and the certificate allows it to request
membership in the domain. Any subsequent routing within the domain can
then be established (securely), based on certification and addressing
that are assigned to the node as it joins.
Bill Atwood
On 2026-07-15 4:59 p.m., Brian E Carpenter wrote:
Attention This email originates from outside the concordia.ca domain. //
Ce courriel provient de l'extérieur du domaine de concordia.ca
On 16-Jul-26 07:48, Michael Richardson wrote:
Daniele Ceccarelli via Datatracker <[email protected]> wrote:
> I have some minor concerns about this document that I think
should be
> resolved before it is submitted to the IESG. The draft
explains WHAT
> can be discovered (registrars, proxies, pledges) and HOW
variations
> are signaled, but I found it hard to understand HOW this fits
into a
> normal routed network with VLANs, routers, and possibly no
IPv6. The
> core ideas seem reasonable, but more plain-language deployment
> guidance would help non-experts and operators.
GRASP runs over the RFC8994 ACP overlay, which is explicitely IPv6.
To be clear, there's nothing in GRASP that couldn't be hammered into
IPv4, but
it was designed for an IPv6-only ACP environment. It is blind to VLANs I
think,
and it uses link-local IPv6 heavily, but is perfectly happy with
routeable IPv6
addresses. RFC8993 is a good reference if you want an overview.
Even if what's underneath is DECnet, SNA or IPX...
Or X.25? (I hope nobody ever does that.)
The overlay usually runs between routers using IPv6-LL, which are
always available.
However, explicit configuration could overlay over NAT44/NAPT.
RFC8993 is a good reference if you want an overview.
Brian
--
Michael Richardson <[email protected]>, Sandelman Software Works
-= IPv6 IoT consulting =- *I*LIKE*TRAINS*
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--
Dr. J.W. Atwood, Eng. (retired)
Distinguished Professor Emeritus
Department of Computer Science
and Software Engineering
Concordia University ER 1234 email:[email protected]
1455 de Maisonneuve Blvd. West http://users.encs.concordia.ca/~bill
Montreal, Quebec Canada H3G 1M8
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