Re: [Anima] Fwd: I-D Action: draft-carpenter-anima-l2acp-scenarios-00.txt

[Brian E Carpenter <[e-mail]>]

On 28-Feb-19 15:01, Michael Richardson wrote:
> 
> Brian E Carpenter <[e-mail]> wrote:
>     >> Brian E Carpenter <[e-mail]> wrote:
>     >> > Here is a new draft for ANIMA to consider. We believe it is useful
>     >> > to explore the idea of an autonomic control plane constructed at
>     >> > the link layer. Comments please!
>     >>
>     >> Does this mean it transports L2 packets (a la spanning-tree or TRILL), or
>     >> does this mean it uses L2 technologies like MACSEC to create a tunnel
>     >> for L3 packets?
> 
>     > Well, I don't think the draft in its present form should attempt to
>     > answer that question. In my mind I was thinking of a conventional
>     > LAN set up, i.e. spanning tree, but that doesn't have to be the
>     > only way. In practice that usually needs MLDv2 snooping as well.
> 
> okay, so you were thinking about the first part.
> Yes, you need MLDv2 snooping.
> 
>     >> i.e. does L3 multicast appear to just work because it more layer-2 tricks?
> 
>     > L3 multicast works automatically if L2 multicast works, surely (remembering
>     > that there is no router). How L2 multicast works is another question, of
>     > course. I don't mean to say it's unimportant, just that it's not in scope
>     > for this particular draft.
> 
> In other words, more IPv4-inspired L2-tricks to maintain the illusion there
> is a big-blue cable with AUI taps on it.  And continued inability to see L2
> switches, or creatively route around L2 failures :-)

I'd be happy enough to see that done too, but that's a much bigger step
than what we're suggesting, which is a way to get the ANI deployed
in smaller shops than will run a full BRSKI/ACP setup.

As for emulating classic Ethernet, yes, that is how the world works
today in many places.

     Brian