>Yes, scopes have to be convex. This is not new in IPv6.
>See section 7 of the IPv4 scoped multicast RFC (2365).
The worry is that people might look at routing protocols mechanisms
that keep the site convex wrt site-local addresses and consider
that sufficient.
draft-ietf-ipngwg-scoping-arch-03.txt only says:
o Each zone is required to be "convex" from a routing
perspective, i.e., packets sent from one interterface to
any other interface in the same zone are never routed
outside the zone.
which does not seem to preclude my example topology, since the routing
protocol causes the site-local scope zone to be convex.
Bill
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