What happens if connection is temporarily lost during volume replication?

If the connection is lost, the replication will resume as soon as the connection is back. Once the connection is restored, only the synchronization of the data that has not yet been transferred will be carried out. This will happen due to the ECC check of the transmitted data (tied to the metadata). As long as the replication remains active and there are no error-messages, the copy will be consistent.

If the source server fails, you need to promote the destination server to become your source and clear the metadata.

Afterwards, enable the target on the destination server so the initiator will connect.

A good practice would be to add the destination IP address on the initiator side in early stages of setting up the replication.