The ticket
You trained ISE. The shop bought Forescout for OT. They still need 802.1X for laptops. Both can live together via eyeExtend / pxGrid — if you know who owns which decision.
ISE is RADIUS-first: 802.1X, MAB, CWA, dACL. Forescout is visibility-first: discover and classify without a supplicant, then enforce (virtual firewall, switch plugin, or hand off to ISE). ClearPass is Aruba’s RADIUS NAC cousin. Many campuses: Forescout sees everything; ISE authenticates users.
PAN ise-pan 10.10.10.20 · PSN ise-psn1 10.10.10.21 · MnT ise-mnt 10.10.10.22 · NAD sw-access-01 10.10.10.2 · AD dc01 10.20.30.10 · Priya 10.20.30.80 TECHCLICK\priya.hr · printer 10.20.30.60. Not a live customer.
Translation table
| Idea | ISE | Forescout | ClearPass |
|---|---|---|---|
| Brain | PAN / PSN | Enterprise Manager / Appliance | Publisher / Subscriber |
| User auth | 802.1X PEAP/EAP-TLS | Often via ISE/NPS plugin | 802.1X |
| Agentless device | MAB + profiling | eyeSight discovery | Profiling |
| Enforce | dACL / VLAN / CoA | Virtual FW / switch plugin / ISE | Enforcement profiles |
| Logs | Live Logs | Policy / host log | Access tracker |
When each bites
| Need | Lead with |
|---|---|
| User identity on campus ports | ISE 802.1X |
| OT / IoT / medical with no supplicant | Forescout visibility, careful enforce |
| Aruba wireless estate | ClearPass is native; ISE still works |
| Both users and OT | Forescout + ISE together |
Interview answer
Their word
“eyeSight is your discover. On ISE I would call that profiling + Context Visibility.”
One proof
ISE: Live Logs. Forescout: host profile + policy hit.
One failure
Unknown permit-all, or 802.1X on a PLC.
Four mix-ups
1 · Calling Enterprise Manager “the PSN”
2 · 802.1X on OT because “NAC requires it”
3 · Two systems enforcing opposite VLANs
4 · Brand rant
Say it out loud
ISE authenticates users with RADIUS and downloads dACLs. Forescout finds devices that cannot authenticate and can orchestrate ISE or the switch. I would not run two conflicting enforcement owners on the same port.
Traps
| They say | You say |
|---|---|
| Agentless NAC | Forescout visibility or ISE MAB+profile |
| Policy set | Forescout policy tree / ClearPass service |
| CoA | Same idea: bounce the session after classify |
Knowledge check
Judgment items. One best answer. Reasons send you back to the matching section.
Cisco ISE class series: Personas · First day · NAD + RADIUS · Policy sets · Wired 802.1X · MAB · CWA / guest · Profiling · dACL vs VLAN · Live logs · vs Forescout · Interview
Sources
- This ISE series + Forescout series.
- Forescout product pages: eyeSight / eyeControl / eyeExtend.
- ISE 3.3 personas and policy sets.
Related: ISE evidence desk · session factory · Forescout series.