Default QinQ SAPs are only supported on 7210 SAS platforms operating in access-uplink mode.
The following is a sample VPLS SAP configuration output of Default QinQ SAPs.
ALA-1>config>service# vpls 9 customer 1 svc-sap-type null-star create
            shutdown
            stp                       
                shutdown
            exit
            sap 1/1/5:*.* create
                statistics
                    ingress
                    exit
                exit
            exit
            sap 1/1/6:*.* create
                statistics
                    ingress
                    exit
                exit
            exit
        exit