On the QFX5200 platform, some 100g interfaces that are functional may remain down after a reboot or an upgrade.
The 100g interfaces that remain down can be brought online by soft removal/insertion. vty fpc<> set cmqfx xcrv remove pic 0 port <> set cmqfx xcrv insert pic 0 port <> This issue has been addressed PR1725116 https://prsearch.juniper.net/problemreport/PR1725116