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Re: [Anima] I-D Action: draft-ietf-anima-grasp-13.txt - SONN

Michael Richardson <mcr+ietf@sandelman.ca> Thu, 08 June 2017 15:59 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Anima WG <anima@ietf.org>
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Date: Thu, 08 Jun 2017 11:59:31 -0400
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Subject: Re: [Anima] I-D Action: draft-ietf-anima-grasp-13.txt - SONN
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Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
    > Well yes, but for discovery & flooding you actually need to emulate
    > multicast. GRASP assumes that the ACP VRF will do that. If not, GRASP
    > would have to access the adjacency table and send N copies. I could
    > code that, but I don't think I should need to.

GRASP is doing application layer multicast.  That's why we have those
session-IDs, and the checking and the caching, etc.

It's news to me that the ACP will emulate layer-2 multicast!

I expected GRASP to send a copy on each interface (you do that now!), and the
ACP will present each link in the VRF as an interface.

If you want multicast support in the ACP, would you like:
   1) PIM? (dense or sparse)
   2) MPL?
   3) something totally bleeding edge (but very cool) like BIER?


--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-

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