@staticmethod
def interfaces_roles_dont_change_and_router_transition_to_it_or_ot(interface:
    'TreeInterfaceUpstream') ->None:
    """
        Interfaces roles dont change (this interface remains Root) AND
        BestUpstreamNeighbor does not change AND
        router changes its interest in receiving data packets (becomes interested or not interested)
        """
    interface.logger.debug(
        'interfaces_roles_dont_change_and_router_transition_to_it_or_ot')
    interface.send_my_interest()
