Martin List-Petersen wrote:
[..]
your switches are layer2, tcp/ip (be it v4 or v6) goes on top of that
and your switches wouldn't know the difference.
Unfortunately that is not really the case. Especially when it comes to
handling multicast there are certain (not many though) switches that do
not properly handle multicast, as such all IPv6 Neighbor Discovery goes
bad. Sometimes it does work at one point and then fails at another. This
happened to several 'expensive' switches and also to cheap ones.