def set_lan_port(self, port_id, mac=None):
        """Set LAN port information to configuration.

        :param port_id: Physical port ID.
        :param mac: virtual MAC address if virtualization is necessary.
        """
        port_handler = _parse_physical_port_id(port_id)
        port = self._find_port(port_handler)
        if port:
            port_handler.set_lan_port(port, mac)
        else:
            self._add_port(port_handler, port_handler.create_lan_port(mac))
Set LAN port information to configuration.

        :param port_id: Physical port ID.
        :param mac: virtual MAC address if virtualization is necessary.