Hello ,
You can try to use VLAN tagging :
**/ Set interface for vlan tagging /**
set interfaces ge-0/0/10 vlan-tagging
**/set the unit number and assign a vlan tag. Typically you match the unit number and vlan tag/**
set interfaces ge-0/0/10 unit 10 vlan-id 10
**/ Now you assign an IP for L3 addressing/**
set interface ge-0/0/10 unit 10 family inet address x.x.x.x/x
**/Repeat for the same procedure for the vlan tags and addressing for each vlan you wish to host on your SR
set interfaces ge-0/0/10unit 20 vlan-id 20
set interface ge-0/0/10 unit 20 family inet address x.x.x.x/x
set interfaces ge-0/0/10 unit 30 vlan-id 30
set interface ge-0/0/10 unit 30 family inet address x.x.x.x/x