On Thu, 19 Feb 2015, Michael Richardson wrote:
But, as for physical ports on homenet devices, in the architecture we
say that those are supposed to be merged as a single l2 domain, and only
split up if there is some (out of band) reason to do that.
Are you referring to 3.3.2 now (it took me quite a while to find it)?
3.3.2. Largest Practical Subnets
Today's IPv4 home networks generally have a single subnet, and early
dual-stack deployments have a single congruent IPv6 subnet, possibly
with some bridging functionality. More recently, some vendors have
started to introduce 'home' and 'guest' functions, which in IPv6
would be implemented as two subnets.
Future home networks are highly likely to have one or more internal
routers and thus need multiple subnets for the reasons described
earlier. As part of the self-organisation of the network, the
homenet should subdivide itself into the largest practical subnets
that can be constructed within the constraints of link-layer
mechanisms, bridging, physical connectivity, and policy, and where
applicable, performance or other criteria. In such subdivisions, the
logical topology may not necessarily match the physical topology.
This text does not, however, make recommendations on how such
subdivision should occur. It is expected that subsequent documents
will address this problem.
While it may be desirable to maximise the chance of link-local
protocols operating across a homenet by maximising the size of a
subnet, multi-subnet home networks are inevitable, so their support
must be included.
The way this is currently written, it does look like we need some kind of
protocol and intelligence to self-organize the ports into either L2
domains or dedicated ports, for instance to avoid L2 loops, depending on
how the user connects things together. I am not aware of any work done in
this area. 3.3 says the network should be self-organizing, so the user
should not be required to know what they're doing.
--
Mikael Abrahamsson email: [email protected]
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