ISE - DHCP SPAN and DHCP Profiling

Question

Hi everyone,
We're embarking on an evaluation of ISE and trying to clarify my thoughts around the DHCP based profiling probes.
If we are using DHCP SPAN and have all DHCP traffic mirrored to ISE, should we still use IP helpers and the DHCP probe?
I would expect if we're using DHCP SPAN and mirroring all the traffic then using the DHCP probe with IP helpers on floor switches is a little redundant.
Thanks,
Mark

Answer 1

Hi,
Just to add from my experience;
I am deploying ISE for the first time, I have around 100 sites ( I only use ISE+WLC 7.3, NO WIRED).
It's good to forward all dhcp request to ISE with IP-HELPERS before deploying.
This is what I did with one of my sites and I had no problem when they switched over as 90% of devices were already profiles using dhcp probe
Hope to help.
P.s note that WLC 7.3 does send first http packet to ISE but only if you opened up safari first after authentication, if you opened any other application that uses http protocol it will send weird strings to ise, ie VIBER and so on.
Look around i've posted a thread about it