Just to add to this... You will need to add the default vlan to each port on any switch that is not the master. My commands from adding them on the 24 port switch:
set interfaces ge-1/0/17 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/16 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/15 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/14 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/13 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/12 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/11 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/10 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/9 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/8 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/7 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/6 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/5 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/4 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/3 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/2 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/1 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/0 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/18 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/19 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/20 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/21 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/22 unit 0 family ethernet-switching vlan members default
set interfaces ge-1/0/23 unit 0 family ethernet-switching vlan members default