HI Jonas
For one of the cases where we had to transport LACP packets which we could not do through QinQ we did it through pseudowire.
Config Example.
LACP packets----xe-0/0/10---> QFX1--xe-0/0/19--------------l2circuit------xe-0/0/19---->QFX 2--xe-0/0/10----> receiving LACP packets
Configuration used on QFX1:
set interfaces xe-0/0/10 encapsulation ethernet-ccc
set interfaces xe-0/0/10 unit 0 family ccc
set interfaces xe-0/0/19 unit 0 family inet address 10.10.10.20/24
set interfaces xe-0/0/19 unit 0 family mpls
set interfaces em0 unit 0 family inet address 10.85.20.235/24
set interfaces lo0 unit 0 family inet address 4.4.4.4/32
set routing-options static route 0.0.0.0/0 next-hop 10.85.20.1
set protocols mpls label-switched-path PE1-to-PE2 to 1.1.1.1
set protocols mpls interface xe-0/0/19.0
set protocols ospf area 0.0.0.0 interface xe-0/0/19.0 interface-type p2p
set protocols ospf area 0.0.0.0 interface lo0.0 passive
set protocols ldp interface xe-0/0/19.0
set protocols ldp interface lo0.0
set protocols l2circuit neighbor 1.1.1.1 interface xe-0/0/10.0 virtual-circuit-id 1
Configuration used on QFX2:
set interfaces xe-0/0/10 encapsulation ethernet-ccc
set interfaces xe-0/0/10 unit 0 family ccc
set interfaces xe-0/0/19 unit 0 family inet address 10.10.10.10/24
set interfaces xe-0/0/19 unit 0 family mpls
set interfaces em0 unit 0 family inet address 10.85.20.234/24
set interfaces lo0 unit 0 family inet address 1.1.1.1/32
set routing-options static route 0.0.0.0/0 next-hop 10.85.20.1
set protocols mpls label-switched-path PE2-to-PE1 to 4.4.4.4
set protocols mpls interface xe-0/0/19.0
set protocols ospf area 0.0.0.0 interface xe-0/0/19.0 interface-type p2p
set protocols ospf area 0.0.0.0 interface lo0.0 passive
set protocols ldp interface xe-0/0/19.0
set protocols ldp interface lo0.0
set protocols l2circuit neighbor 4.4.4.4 interface xe-0/0/10.0 virtual-circuit-id 1
Please note that the above configuration would be supported on the latest code 14.1X53-D30.3. I had tested