This writable enumerated value specifies whether the domain ID set in hh3cVsanDmDomainIdConfigured is static (must be exactly honored) or preferred (a hint the principal switch can override), defaulting to preferred. Admins choose static(1) when a fixed domain ID is required for compatibility with existing zoning or addressing, and preferred(2) when they want flexibility to let the principal switch assign whichever ID is available. For example, setting this to static(1) means that if the principal switch tries to assign a different domain ID than the one configured, the local switch will isolate its upstream link rather than accept it.