Re: [v6ops] draft-ietf-6man-grand : saving lookups

"Templin (US), Fred L" <> Tue, 11 August 2020 16:49 UTC

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From: "Templin (US), Fred L" <>
To: Ted Lemon <>
CC: Bob Hinden <>, Nick Hilliard <>, "" <>, IPv6 List <>
Thread-Topic: [v6ops] draft-ietf-6man-grand : saving lookups
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Date: Tue, 11 Aug 2020 16:48:13 +0000
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Subject: Re: [v6ops] draft-ietf-6man-grand : saving lookups
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On Aug 11, 2020, at 10:54 AM, Templin (US), Fred L <<>> wrote:
Some NBMA links can be *very* large, with all nodes on the link as candidates for receiving
link-scoped multicast. However, with proper controls on limiting the transmission of link
scoped multicast, the transmissions can be effectively propagated to exactly that (small)
group of nodes on the link that actually need to receive them. So, if there is going to be a
draft please make sure to add a note to the effect that properly engineered NBMA links
are an exception, and can in fact support a very large broadcast domain.

This seems related to the notion that rather than doing unacknowledged multicasts on WiFi, the AP should simply unicast the multicast packet to all interested stations serially.

That is more or less the principle for NBMA, yes. But take a conservatively-sized NBMA
link with 1M nodes on the link but only 2-3 of them need to receive the multicast then
serially unicasting seems pretty efficient and does not disturb the vast majority of
nodes that don’t care.

Thanks - Fred