Ceph

IPv6 has interesting features, such as the expectation that hosts have multiple addresses per interface (local link, public IPs, private IPs).

It might be more useful to require only that all daemons can talk to other daemons over at least one route, but not necessarily that any single daemon need communicate with each other daemon via the same route. Implicit in that is that not all daemons need be on a single network. (A fictional and easily constructed topology would be three servers connected via crossover cable in a (3 cable total) mesh topology, with each physical cable assigned it's own network segment. This might be desirable in case they are mistakenly wired to the same network as routing and diagnostics would still function.)

Each daemon would keep track of three sets of routing metrics. The first would be the host system's local routing metric table. The second would reflect the current performance expectations of each link, while the third would be the score over some slightly recent interval. Every so often the third would be updated to the mons.

When establishing communication the common path between any two daemons with the lowest score would then be the winner; such a score might consider the likely bias of information flow as an additional modifier to each metric.