Re: [homenet] [Anima] ANIMA scope + homenet interaction + charter v15

[Ole Troan <[e-mail]>]

>> What does flow-through PD mean? Do you have any reference on that?
> 
> It means that the edge router has the delegation, and then sub-delegates individual /64s from the pool of /64s it was delegated by the ISP, rather than splitting its delegation and delegating chunks of that delegation to downstream routers which will then delegate in turn.   In order for this to work, downstream routers have to relay PD requests to the edge router, and install routes to the delegated prefixes.   Something analogous could work on an autonomous network; I don't know that it's the right way to solve the problem, but it's certainly one way to solve the problem.   Homenet went with HNCP because it's more sensitive to arbitrary topology changes.
> 
> The hierarchical model doesn't work because it doesn't anticipate new routers being added to the network, and doesn't account for unbalanced topologies.   I thought the hipnet proposal wound up going with the flow-through model, not the hierarchical model, but I may be mistaken.

I think the homenet wg did a good of analysing the 3 variants proposed.
the "flow-through" model as far as I can recall suffers from DHCP's general problem of dealing with multiple sources of information (think multihoming with separate CE routers), in addition you either need to build what's essentially a spanning tree of DHCP relays or you need some mechanism to discover the set of DHCP server(s). certainly do-able, but not quite out of the box.

cheers,
Ole