Opening this Jira asking for the necessity to report the firewall requirements in the official documentation about the communication between clusters in multi-cluster topologies.

For example this information might be added here:

https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0/html/installing/ossm-multi-cluster-topologies#ossm-about-multi-cluster-mesh-topologies_ossm-multi-cluster-topologies