Yes, that will work:
[edit]
lab@MX960-re0# run show version | match "boot|Model"
Model: mx960
JUNOS Base OS boot [12.3R6.6]
[edit]
lab@MX960-re0# show interfaces ae0 | display set
set interfaces ae0 vlan-tagging
set interfaces ae0 aggregated-ether-options lacp active
set interfaces ae0 unit 100 vlan-id 100
set interfaces ae0 unit 100 family inet filter input F
set interfaces ae0 unit 100 family inet address 1.1.1.1/24
set interfaces ae0 unit 200 vlan-id 200
set interfaces ae0 unit 200 family inet address 2.2.2.2/24
[edit]
lab@MX960-re0# show interfaces | display set | match ge-2/0
set interfaces ge-2/0/1 gigether-options 802.3ad ae0
set interfaces ge-2/0/2 gigether-options 802.3ad ae0
set interfaces ge-2/0/3 gigether-options 802.3ad ae0
set interfaces ge-2/0/4 gigether-options 802.3ad ae0
[edit]
lab@MX960-re0# show chassis | display set
set chassis aggregated-devices ethernet device-count 1
[edit]
lab@MX960-re0# commit check
re0:
configuration check succeeds
re1:
configuration check succeeds
[edit]
lab@MX960-re0#
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If this worked for you please flag my post as an "Accepted Solution" so others can benefit. A kudo would be cool if you think I earned it.