This notification indicates that the sending switch has become the new Principal Switch on a VSAN. This notification is sent soon after its election as the new Principal Switch, i.e., upon expiration of a Principal Switch selection timer which is equal to twice Fabric Stability Timeout value (F_S_TOV). This notification contains the vsanIndex of the VSAN on which the switch became the Principal Switch and the WWN of the switch which became the Principal Switch.