On SRX550 Series devices, after the Junos OS command request system halt is run, the link LED on the SFP-T interface stays on. This behavior does not occur with onboard RJ-45 ports. The LED for onboard RJ-45 ports goes off with the request system halt Junos OS command. However, the LED from the SFP port stays turned on.
request system halt
This article clarifies that this behavior is by design and no action is required.
This behavior is by design. The request system halt command does not power off the system. Therefore, the LED for the SFP port stays on as long as the system has power.
2020-10-23: Article reviewed for accuracy; no changes made; article valid and relevant