What happens to demoted messages in an MNR network?
Multi-Node Routing (MNR) allows multi-broker distributing of direct messages, but what happens when you publish a persistent (guaranteed) message that matches a direct consumer locally or somewhere in the MNR network? The message will be demoted to direct for the local consumers to receive, but a published persistent (guaranteed) message will never be sent over an MNR link even if there is a direct consumer listening on the other side.
Note that if you are using persistent messaging you should use Dynamic Message Routing (DMR) instead of MNR. DMR supports both direct and persistent messages.