qos的做法，一个小问题请高手指教

zc9

我想根据不同的业务分配带宽，使用CBWFQ队列调度，可是在配置的时候，总是提示：\r\n[Router-qospolicy-c-cbwfq default-class]af bandwidth 340\r\nCBQ : Can be enabled as an output feature only.\r\n[Router-qospolicy-c-cbwfq default-class]\r\n不知道是怎么回事，具体配置如下：（下划线部分是想加入的配置）\r\n!\r\nversion 1.74\r\nfirewall enable\r\naaa-enable\r\naaa accounting-scheme optional\r\n!\r\nacl 3011 match-order config\r\nrule normal permit ip source 16.128.45.128 0.0.0.15 destination any\r\nrule normal permit ip source 16.128.45.48 0.0.0.15 destination any\r\nrule normal permit ip source any destination 16.128.45.128 0.0.0.15\r\nrule normal permit ip source any destination 16.128.45.48 0.0.0.15\r\nrule normal deny ip source any destination any\r\n!\r\nacl 3012 match-order config\r\nrule normal permit ip source 16.128.186.0 0.0.0.255 destination any\r\nrule normal permit ip source any destination 16.128.186.0 0.0.0.255\r\nrule normal deny ip source any destination any\r\n!\r\nacl 3014 match-order config\r\nrule normal permit ip source 16.128.141.128 0.0.0.15 destination any\r\nrule normal permit ip source any destination 16.128.141.128 0.0.0.15\r\nrule normal deny ip source any destination any\r\n!\r\ninterface Aux0 \r\nasync mode flow\r\nlink-protocol ppp\r\n!\r\ninterface Ethernet0 \r\n!\r\ninterface Ethernet0.1\r\ndescription yingye\r\nvlan-type dot1q vid 140 \r\nip address 16.128.45.129 255.255.255.240\r\n!\r\ninterface Ethernet0.2\r\ndescription qiye\r\nvlan-type dot1q vid 110 \r\nip address 16.128.186.98 255.255.255.0\r\n!\r\ninterface Ethernet0.3\r\ndescription guanli\r\nvlan-type dot1q vid 1024 \r\nip address 16.128.1.129 255.255.255.240\r\n!\r\ninterface Ethernet0.4\r\ndescription VOIP\r\nvlan-type dot1q vid 4 \r\nip address 16.128.141.129 255.255.255.240\r\n!\r\ninterface Serial0 \r\nlink-protocol ppp\r\nip address 16.128.226.18 255.255.255.252\r\n!\r\nqos class logic-and qiye\r\nif-match acl 3012\r\n!\r\nqos class logic-and yingye\r\nif-match acl 3011\r\n!\r\nqos class logic-and voip\r\nif-match acl 3014\r\n!\r\nquit\r\nqos policy cbwfq\r\nqos-class default-class\r\naf bandwidth 500\r\nquit\r\nqos-class yingye\r\naf bandwidth 840\r\nquit\r\nqos-class voip\r\naf bandwidth 512\r\nquit\r\nquit\r\n!\r\nreturn\r\n\r\n[Router]\r\n请大侠指点