* All nodes must be in the same network as corosync uses IP Multicast
to communicate between nodes (also see
http://www.corosync.org[Corosync Cluster Engine]). Corosync uses UDP
- ports 5404and 5405 for cluster communication.
+ ports 5404 and 5405 for cluster communication.
+
NOTE: Some switches do not support IP multicast by default and must be
manually enabled first.