Hi cdjny,
Greetings, Unfortunately, this behavior is expected for these platforms: QFX5100&EX4600, as they use the same Broadcom chipset and Linux-host infrastructure. Linux-host system halt requires the user to hit the power button to reboot.
This issue was tracked in: PR950910 and it is a platform limitation
https://www.juniper.net/documentation/en_US/junos/topics/reference/command-summary/request-system-halt.html
When you issue this command on a QFX5100 switch, you are not prompted to reboot. You must power cycle the switch to reboot.
EX4600 should be included in this statement as well for the reasons I mentioned above
If this solves your problem, please mark this post as "Accepted Solution" so we can help others too \:)/
Regards,
Lil Dexx
JNCIE-ENT#863, 3X JNCIP-[SP-ENT-DC], 4X JNCIA [cloud-DevOps-Junos-Design], Champions Ingenius, SSYB