Comment on Instance A does not federate with Instance B. But B federates with A. What does it mean to a user?
simple@lemm.ee 1 day ago
It means both instances will see old posts from before one of them defederated.
Now that A is de-federated from B, they both won’t see new posts from eachother. In the case of fedia and ani.social, you won’t get any new posts from any of their communities or users. If you post on anime@ani.social from fedia, nobody will see that post outside of fedia because ani.social isn’t seeing it and passing it around.
You hav basically the right idea, everything stops syncing when one defederates.
Lazycog@sopuli.xyz 1 day ago
Yup. Since fedia.io was federating with ani.social for awhile you’ve got a “local copy” of ani.social’s communities on fedia.io from back when it federated.
So when you post on those communities it’s all happening only on fedia.io and you see posts/comments on that community from other fedia.io users. But, for example, I can’t see what fedia.io local copy of anime@ani.social looks like from my instance, because my “local copy” is still federating with the actual instance anime community is hosted on (i see new posts and my posts/comments get sent first to ani.social’s original community and federates to rest of instances from there).