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.