ISE will not let me add a switch in the same subnet

[Nick O]

I am trying to add a switch to add another switch to my network devices on ISE. I have the switches in a x.x.254.0/24 subnet. ISE will not let me add a device in the same subnet. 

[marce1000]

          - What do you mean by that ? You can only add one NAD at a time , 

 M.

[Damien Miller]

You should Ideally be adding your NADs as /32. ISE treats them as individual devices that way.

If you add a NAD as a /24 then all addresses in that subnet are treated as one device. There are use cases for using subnets but you can avoid your issue by changing the way you add them.

[balaji.bandi]

Agreed @Damien Miller  - try single IP rather subnet - that should fix the issue.

[Nick O]

and that would not affect the way I have them set up on the switch? because I have them set up as a x.x.x.30/24. And if I am understanding what we are saying is that ISE will treat it as a single device with a /32. do I need to make the change on the switch as well? 

[balaji.bandi · Accepted solution]

Not on the switch -  Only ISE Side good enough.