All of our switches are configured via LAN automation in DNA-C.
I noticed that our ISE nodes were not getting DHCP profiling info on endpoints. I checked the config on the switch and there is no ip helper-address for ISE, only for the DHCP servers.
Is it expected that DNA-C should have deployed the ip helper-address config for ISE nodes or is this a manual config that must be pushed via templates?
The DHCP forwarding is a unicast forwarded packet. There is no tagging involved. Remember DHCP forwarding only worked with a clients initial broadcast DHCP request. DHCP renewals are unicast packets to the DHCP. ISE will never see those from DHCP forwarding.
I don't know much about DNA Center, but I do know that device sensor compatible network devices don't require ip helper with ISE IP address. So IP helper for ISE profiling may not have been part of the automation process.
There are 2 options for DHCP profiling - IP helper (ISE PSN Address) and Device sensor (using the dhcp binding database). Preferred and most common is Device Sensor.