应用说明 目标：在AR1830上同时启用NAT和QOS，从PC1发送的数据流定义为Gold（优先级为5），至少要保证50％的ADSL带宽；从PC2发送的数据流定义为multimedia(优先级3)，至少要保证20％的ADSL带宽；网管(优先级7)要保证10%带宽，但是在网络不忙的时候， 各个数据流都可以超过自己所定义的带宽。 实现：首先是在以太网入口上,对Gold，Multimedia做识别并打IP-precedence,对于网管流量,配置classifier来匹配源地址是Lo0口的数据包,然后在上行口(adsl口)先配置car来打IP-precedence,并同时配置EF队列保证优先转发。对在以太网入口打过IP-precedence的Multimedia和gold流,在上行口上做AF队列来保证带宽。 这里要注意的一点是,在出接口上要么只能配置百分比带宽,要么只能配置指定数字带宽,不能如客户要求的那样配置成既有百分比又有数据带宽（如25%/25%/16K）,所以需要预先知道上行带宽,然后自己计算一下,再确认是配置成百分比还是数字带宽。 另外，ADSL接口的QoS带宽根据国际标准均为640bps。 组网图 注意事项 1、 QoS CBQ只能应用在ATM接口的PVC下，不可以直接用在ATM接口或Dialer口； 详细配置 AR18-30（PPPoE Client）配置： dis cur # sysname Router # dialer-rule 1 ip permit # traffic classifier gold operator and if-match ip-precedence 5 traffic classifier snmp operator and if-match acl 3003 traffic classifier multimedia operator and if-match ip-precedence 3 # traffic behavior gold queue af bandwidth pct 50 traffic behavior snmp queue af bandwidth pct 10 traffic behavior multimedia queue af bandwidth pct 20 # qos policy policy1 classifier multimedia behavior multimedia classifier gold behavior gold classifier snmp behavior snmp # interface Dialer1 link-protocol ppp mtu 1450 ip address ppp-negotiate dialer user test dialer-group 1 dialer bundle 1 nat outbound 3000 # interface Ethernet1/0 ip address 202.150.1.31 255.255.255.0 qos car inbound acl 3001 cir 100000000 cbs 100000000 ebs 0 green remark-prec-pa ss 5 red remark-prec-pass 5 qos car inbound acl 3002 cir 100000000 cbs 100000000 ebs 0 green remark-prec-pa ss 3 red remark-prec-pass 3 # interface Atm2/0 pvc 4/33 map bridge Virtual-Ethernet1 qos reserved-bandwidth pct 100 qos apply policy policy1 outbound qos car outbound acl 3003 cir 16000 cbs 15000 ebs 0 green remark-prec-pass 7 re d remark-prec-pass 7 # interface Virtual-Ethernet1 pppoe-client dial-bundle-number 1 # interface NULL0 # interface LoopBack0 ip address 202.150.10.1 255.255.255.255 # acl number 3000 rule 0 permit ip source 202.150.1.0 0.0.0.255 rule 1 deny ip acl number 3001 rule 0 permit ip source 202.150.1.1 0 acl number 3002 rule 0 permit ip source 202.150.1.2 0 acl number 3003 rule 0 permit ip source 202.150.10.1 0 # ip route-static 0.0.0.0 0.0.0.0 Dialer 1 preference 60 # user-interface con 0 idle-timeout 0 0 user-interface vty 0 4 authentication-mode none user privilege level 3 # return AR4640（PPPoE Server）配置： dis cur # sysname AR46-40 # local-user test password simple test # ip pool 143 202.143.1.100 202.143.1.200 # interface Virtual-Template33 ppp authentication-mode pap scheme default ppp accounting scheme default ip address 202.143.1.46 255.255.255.0 remote address pool 143 # interface Aux0 async mode flow