Hi I am unable to add EX4300 to an MSTP instance. The relevant configuration as below.
Root Bridge
set protocols mstp configuration-name test
set protocols mstp revision-level 1
set protocols mstp bridge-priority 4k
set protocols mstp interface ge-0/0/0 cost 10000
set protocols mstp interface ge-0/0/0 mode point-to-point
set protocols mstp interface ge-0/0/2 cost 12000
set protocols mstp interface ge-0/0/2 mode point-to-point
set protocols mstp interface ge-0/0/3 cost 14000
set protocols mstp interface ge-0/0/3 mode point-to-point
set protocols mstp msti 1 bridge-priority 4k
set protocols mstp msti 1 vlan 310
set protocols mstp msti 1 vlan 1024
set protocols mstp msti 1 interface ge-0/0/0 cost 14000
set protocols mstp msti 1 interface ge-0/0/2 cost 15000
set protocols mstp msti 1 interface ge-0/0/3 cost 16000
Non Root Bridge
set protocols mstp configuration-name test
set protocols mstp revision-level 1
set protocols mstp bridge-priority 36k
set protocols mstp interface ge-0/0/5 edge
set protocols mstp interface ge-0/0/5 no-root-port
set protocols mstp interface ge-0/0/46 cost 10000
set protocols mstp interface ge-0/0/46 mode point-to-point
set protocols mstp interface ge-0/0/47 cost 12000
set protocols mstp interface ge-0/0/47 mode point-to-point
set protocols mstp msti 1 bridge-priority 36k
set protocols mstp msti 1 vlan 310
set protocols mstp msti 1 interface ge-0/0/46 cost 10000
set protocols mstp msti 1 interface ge-0/0/47 cost 12000