Abnormal Connection request from ISE to Switch via port 22

[oumodom]

Dear Cisco ISE lover,

I would like to seek your support as I have an inquiry related to Cisco ISE behaviour access to switch port via port 22.  While the figure below, there is no connection request from ISE to NAD or Switch. 

If there the normal process, what is the purpose from ISE to switch via port 22? 
Thank you, 

https://www.cisco.com/c/en/us/td/docs/security/ise/3-0/install_guide/b_ise_InstallationGuide30/b_ise_InstallationGuide27_chapter_0110.pdf 

[oumodom]

@Leo Laohoo @Arne Bier 

Do you have any idea on this please ?

[Arne Bier]

@oumodom I have not seen this in practice, but ISE does have the ability to log into network devices as part of the TrustSec settings for that device.

[oumodom]

Thank @Arne Bier
By the ways, we don't use TrustSec.