satelite:
2 node cluster: 1 disc, 1 RAM

central: 2 node cluster: 1 disc, 1 RAM

Exchanges on each cluster: hub: local topic exchange fed-hub: bi-directionally federated topic exchange

A bi-directionally federated exchange named fed-hub, meaning that if a message is published to the fed-hub exchange on either cluster, it will transit the network and be subscribable on the other.

Federated exchanges are configured with uni-directional links, so it is possible to have a federated hub that only sends data in one direction.