В общем вот так???
user@host# set chassis aggregated-devices ethernet device-count 5
user@host# set interfaces ge-2/0/1 ether-options 802.3ad ae0
user@host# set interfaces ge-2/0/2 ether-options 802.3ad ae0
user@host# set interfaces ae0 aggregated-ether-options lacp active
user@host# set interfaces ae0 unit 0 family inet address
10.168.0.1/30