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The feature you want to configure is a "firewall filter". These are stateless packet filters that can match particular conditions and block or allow the traffic at an interface. THey work in a manner very similar to Cisco ACLs.Documentationhttp://www.juniper.net/techpubs/en_US/junos11.1/topics/concept/firewall-filter-qfx-series-overview.htmlDay One Booklet: Configuring Junos Policies and Firewall Filtershttp://forums.juniper.net/t5/Day-One-Books/Day-One-Book-Configuring-Junos-Policies-and-Firewall-Filters/ba-p/108004E-learning for EX Switches - check the firewall filter sectionhttps://learningportal.juniper.net/juniper/resources/courses/ed_serv/edu_jun_wbt_jsl_second/index.html