Re: [v6ops] new draft: draft-yc-v6ops-solicited-ra-unicast

"Fred Baker (fred)" <fred@cisco.com> Fri, 17 July 2015 07:34 UTC

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From: "Fred Baker (fred)" <fred@cisco.com>
To: Mark Smith <markzzzsmith@gmail.com>
Thread-Topic: [v6ops] new draft: draft-yc-v6ops-solicited-ra-unicast
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Date: Fri, 17 Jul 2015 07:34:13 +0000
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Subject: Re: [v6ops] new draft: draft-yc-v6ops-solicited-ra-unicast
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> 
> So the next logical thing to do would be to have the router default to
> unicast Router Advertisements, measure the rate of received Router
> Solicitations, and switch to multicast RA mode past a certain
> threshold to cover this sort of situation. Once the number of RSes
> falls, it switches back to unicast RA mode.
> 
> That would get rid of the configuration knob proposed in this ID, and
> is behaviour that I think could be universal for all link types,
> rather than just for the case of wireless ones with mobile devices.

If it were me implementing it, I think I would go about this in a little different way, hopefully simpler. I would want to send at most one (e.g., either zero or one) RA per some interval (a second?). In the normal case, that is sent unicast. However, having sent a unicast RA at time t, if I now receive another RS before t+1, I send the next one (at time t+1) as a multicast.