Hello,
This is NOT L2circuit, this looks like QinQ with Layer 2 Protocol Tunneling (L2PT).
EX series L2PT
https://www.juniper.net/techpubs/en_US/junos13.3/topics/task/configuration/l2pt-ex-series-cli.html
https://www.juniper.net/techpubs/en_US/junos13.3/topics/example/l2pt-ex-series.html
Ex series QinQ
https://www.juniper.net/techpubs/en_US/junos13.2/topics/example/qinq-tunneling-ex-series.html
HTH
Thx
Alex