Earlier quoted context omitted.
If you've ever implemented IS-IS or OSPF before, like 80% of the work is "LSP flooding", which is just the process that gets updates about available links from one end of the network to another as fast as possible without drowning the links themselves in update messages. Flooding algorithms don't build consensus, unlike Raft quorums, which intrinsically have a centralized set of authorities that keep a single source…
this doesn't paint a full picture of your options, as there's nothing that stops you from having zonal/regional consensus and then replication across regions/long-range topologies for global distribution. to be pithy about it, going full-bore gossip protocol is like going full-bore blockchain: solves a problem, introduces a lot of much more painful problems, and would've been solved much more neatly with a little bit…
Of course, OSPF has topology and aggregation, too.
At any rate: I didn't design the system we're talking about.