wget http://docs.cacti.net/_media/plugin:aggregate-v0.75.tgz


 mv plugin\:aggregate-v0.75.tgz aggregate-v0.75.tgz


 tar zxvf aggregate-v0.75.tgz aggregate/


 mv aggregate /usr/local/cacti/plugins

登陆cacti管理页面，进入Plugin Management下，安装并激活插件：