Multiprotocol Label Switching

# vMX1
set interfaces ge-0/0/0 unit 0 family inet address 10.0.12.1/29
set interfaces lo0 unit 0 family inet address 1.1.1.1/32

# vMX2
set interfaces ge-0/0/0 unit 0 family inet address 10.0.23.2/29
set interfaces ge-0/0/1 unit 0 family inet address 10.0.12.2/29
set interfaces lo0 unit 0 family inet address 2.2.2.2/32

# vMX3
set interfaces ge-0/0/0 unit 0 family inet address 10.0.34.3/29
set interfaces ge-0/0/1 unit 0 family inet address 10.0.23.3/29
set interfaces lo0 unit 0 family inet address 3.3.3.3/32

# vMX4
set interfaces ge-0/0/1 unit 0 family inet address 10.0.34.4/29
set interfaces lo0 unit 0 family inet address 4.4.4.4/32

# vMX1
set protocols ospf area 0.0.0.0 interface lo0.0
set protocols ospf area 0.0.0.0 interface ge-0/0/0.0

# vMX2 + vMX3
set protocols ospf area 0.0.0.0 interface lo0.0
set protocols ospf area 0.0.0.0 interface ge-0/0/0.0
set protocols ospf area 0.0.0.0 interface ge-0/0/1.0

# vMX4
set protocols ospf area 0.0.0.0 interface lo0.0
set protocols ospf area 0.0.0.0 interface ge-0/0/1.0

# vMX1
set interfaces ge-0/0/0 unit 0 family mpls
set protocols mpls interface ge-0/0/0.0

# vMX2 + vMX3
set interfaces ge-0/0/0 unit 0 family mpls
set interfaces ge-0/0/1 unit 0 family mpls
set protocols mpls interface ge-0/0/0.0
set protocols mpls interface ge-0/0/1.0

# vMX4
set interfaces ge-0/0/1 unit 0 family mpls
set protocols mpls interface ge-0/0/1.0

# vMX1 (Ingress Router)
set routing-options static route 4.4.4.4/32 static-lsp-next-hop R1-to-R4
set protocols mpls static-label-switched-path R1-to-R4 ingress next-hop 10.0.12.2
set protocols mpls static-label-switched-path R1-to-R4 ingress to 4.4.4.4
set protocols mpls static-label-switched-path R1-to-R4 ingress push 1000822

# vMX2 (Transit Router)
set protocols mpls static-label-switched-path R1-to-R4 transit 1000822 next-hop 10.0.23.3
set protocols mpls static-label-switched-path R1-to-R4 transit 1000822 swap 1000675

# vMX3 (Penultimate Router)
set protocols mpls static-label-switched-path R1-to-R4 transit 1000675 next-hop 10.0.34.4
set protocols mpls static-label-switched-path R1-to-R4 transit 1000675 pop

# vMX4 (Egress Router)
// no configuration needed

root@vMX1> show route table inet.3

inet.3: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

4.4.4.4/32         *[MPLS/6/1] 00:39:58, metric 0
                    > to 10.0.12.2 via ge-0/0/0.0, Push 1000822

root@vMX2> show route table mpls.0 | find 1000822
1000822            *[MPLS/6] 00:44:07, metric 1
                    > to 10.0.23.3 via ge-0/0/0.0, Swap 1000675

root@vMX3> show route table mpls.0 | find 1000675
1000675            *[MPLS/6] 00:38:49, metric 1
                    > to 10.0.34.4 via ge-0/0/0.0, Pop
1000675(S=0)       *[MPLS/6] 00:38:49, metric 1
                    > to 10.0.34.4 via ge-0/0/0.0, Pop