Please excuse my ignorance, but ... modern Ethernet switches have MAC
address table sizes on the order of hundreds of thousands of entries.
Building a local switched (not routed) network using a hierarchy of
Ethernet switches appears to be a common practice.
So what problem does SUNH solve?
/bill
On 2026-01-09 5:53 p.m., Tom Herbert wrote:
On Fri, Jan 9, 2026 at 2:03 PM dave seddon <[email protected]> wrote:
Now that the context is established, explain why 16 bits were chosen
for the source/destination address. I guess, but it's not in the
document; You were considering the number of hosts in the domain.
The numbers being thrown around for scale-up networks seem to be a
couple of thousand nodes at most. 16 bits nicely rounds to the power
of two and allows plenty of space to scale to reasonably large GPU
clusters. Also, for scale-up we anticipate pretty flat networks with
may two or three hops at most (justifies smaller Hop Limits in the
protocol).
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