> Such a thing is just untrue. IP works on any link, it has to. That's why
> we do IP over Foo.

Agreed, IP is supposed to work on anything from 10Gb/s fiber to carrier
pigeons.  The market has chosen, IP has eaten all of the protocols that
required special support from the link layer.  If a link layer doesn't
fit, we design an adaptation shim (I'm looking at you, ARCNET).

However, this doesn't prevent us from giving advice to link layer
designers for best IP performance.  RFC 3819 (BCP 89) has the following to
say:

   Subnetworks using shared channels (e.g., radio LANs, Ethernets) are
   especially suitable for native multicasting, and their designers
   should make every effort to support it.

Since RFC 3819 is mostly concerned about avoiding receiving unwanted
multicast, it doesn't say anything about the performance of multicast
itself.  Is an update needed?

-- Juliusz

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