You can also disable the Management Ethernet alarm:

set chassis alarm management-ethernet link-down ignore


On Fri, Feb 15, 2019 at 08:01:11PM +0000, Richard McGovern wrote:
> From 
> https://www.juniper.net/documentation/en_US/release-independent/junos/topics/reference/specifications/chassis-qfx5100-status-leds.html
> 
> Red Alarm = A major hardware fault has occurred, such as a temperature alarm 
> or power failure, and the switch has halted.
> 
> From this it appears NOT having the Management Port active but configured is 
> consider a "major hardware fault" when switch is in 'system halt or 
> power-off' state.  I might very well assume that besides QFX5100 other 
> products, like 5110 and EX4600 and maybe other EX switches, function the same.
> 
> For EX4300 its page states, for RED Alarm:
> 
> There is a major alarm. A major alarm indicates a critical error condition 
> that requires immediate attention.
> 
> Note: When you connect power to the switch, the Alarm (ALM) LED glows red. 
> This behavior is normal. Plugging an active Ethernet cable into the 
> management (MGMT) port on the switch completes the network link and turns off 
> the ALM LED. (See Connecting a Device to a Network for Out-of-Band 
> Management.)
> 
> Connecting the switch to a dedicated management console instead of a network 
> does not affect the ALM LED. The LED remains red until the switch is 
> connected to a network.
> 
> An easy test for your QFX5100 would be to power it up and disconnect 
> Management Port and see if alarm goes RED, that is, works like EX4300.
> 
> My 2 cents worth.
> 
> Richard McGovern
> Sr Sales Engineer, Juniper Networks 
> 978-618-3342
>  
> 
> On 2/14/19, 12:33 PM, "Anderson, Charles R" <c...@wpi.edu> wrote:
> 
>     Maybe it lights the red alarm LED so that someone looking knows that it 
> is shutdown/halted, not running normally.
>     
>     On Thu, Feb 14, 2019 at 04:57:48PM +0000, Giovanni Bellac via juniper-nsp 
> wrote:
>     >  
>     > Hi,
>     > it matters for us, because I want to know the root cause of the red 
> alarm LED when powering it down with an enabled management port.
>     > Kind regards
>     >     Am Donnerstag, 14. Februar 2019, 13:12:13 MEZ hat Anderson, Charles 
> R <c...@wpi.edu> Folgendes geschrieben:  
>     >  
>     >  Why does it matter since the switch is halted/powered off anyway?
>     > 
>     > On Thu, Feb 14, 2019 at 08:31:43AM +0000, Giovanni Bellac via 
> juniper-nsp wrote:
>     > >  Hi,
>     > > we are issuing the command (request system power-off) when the switch 
> is booted up normally. We are experiencing this on different JunOS versions 
> (14.1, 17.3, 18.1).
>     > > From our last email:
>     > > Short update:We experiencing the red alarm only when the management 
> port is connected when powering off the QFX5100-48T - weird...When the 
> management port is not connected when powering down the device, there is no 
> red alarm.
>     > > Kind regards
>     > > 
>     > > 
>     > >    Am Mittwoch, 13. Februar 2019, 16:22:59 MEZ hat Anderson, Charles 
> R <c...@wpi.edu> Folgendes geschrieben:  
>     > >  
>     > >  On Wed, Feb 13, 2019 at 11:08:16AM +0000, Giovanni Bellac via 
> juniper-nsp wrote:
>     > > > after powering off a QFX5100-48T (request system power-off) the 
> fans are spinning down and the ALARM LED is lightning red. The switch is 
> working and looking as expected without any error messages.
>     > > > 
>     > > > Is this a normal behavior ? Has someone a spare unit for a short 
> test ?  
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