Principal RBridge election
The RBridge with the lowest World Wide Name (WWN) in the Ethernet fabric is elected as the principal RBridge.
The role of the principal RBridge is to decide whether a new RBridge joining the fabric conflicts with any of the RBridge IDs already present in the fabric. If a conflict arises, the principal RBridge keeps the joining RBridge segmented.
Refer to Configuring a Brocade VCS Fabric for information about setting the RBridge ID.