Juniper is deploying Telefonica's MAN (METRO ACCESS NETWORK) in Spain call FUSION Network, a mix between level 3 and level 2 protrocols (IP & ethernet), among others. On Telecom Operators 400G in the core and transport network is the next step. I would prefer Cisco, but Juniper is really good trial. Not? :)
https://newsroom.juniper.net/press-releases/juniper-networks-collaborates-telefonica-spain-support-advent-5g-iot-and-online