How about configuring the port as trunk? Would something like this work -
labroot@bangui# show interfaces ge-0/0/2
unit 0 {
family ethernet-switching {
port-mode trunk;
vlan {
members 900-999;
}
}
}
https://kb.juniper.net/InfoCenter/index?page=content&id=KB11013&cat=JUNOS&actp=LIST