Juniper Side: Please set up the Chassis aggregation count FIRST, otherwise, it will NEVER work. set chassis aggre device count 64. set interfaces ge-0/0/0 ether-options 802.3ad ae15. set interfaces ge-0/0/1 ether-options 802.3ad ae15. set interfaces ae15 description "to Cisco LACP_ICT Fella". set interfaces ae15 aggregated-ether-options.