Source google image: http://support.huawei.com/hedex/pages/EDOC1000097030DEE1014B/07/EDOC1000097030DEE1014B/07/resources/admin/images/sec_admin_vsys_0034_fig01.png
Layer 3 isolation
Source google image: http://support.huawei.com/hedex/pages/EDOC1000097030DEE1014B/07/EDOC1000097030DEE1014B/07/resources/admin/images/sec_admin_vsys_0034_fig01.png