def METHOD_NAME(self):
    start = 256
    end = 0
    for port_cfg in self._port_cfgs:
        sfp_idx = self.mac_to_sfp[int(port_cfg.lanes.split(',')[0])]
        if sfp_idx >= 48:
            if int(port_cfg.index) <= start:
                start = int(port_cfg.index)
            elif int(port_cfg.index) >= end:
                end = int(port_cfg.index)
    return range(start, end + 1)