The ticket
Port flaps: ISE assigns VLAN 30, Forescout Virtual FW remaps, ISE CoA, repeat. Two owners.
Virtual Firewall: the appliance applies allow/deny (or similar control) using its response path — good for devices that will never do 802.1X. 802.1X/MAB via ISE: the switch is the enforcer; Forescout should only see or trigger ISE via eyeExtend. One port, one enforcement owner.
Enterprise Manager fs-em 10.10.10.30 · Appliance fs-app1 10.10.10.31 · span/mirror on sw-access-01 · same LAN 10.20.30.0/24 · Priya 10.20.30.80 · printer 10.20.30.60 · OT PLC 10.50.1.10. Not a live customer.
Two hammers
| Virtual FW / plugin | ISE 802.1X | |
|---|---|---|
| Enforcer | Appliance / switch CLI | Switch RADIUS |
| Identity | Classification | User/cert/MAC |
| Best | Agentless OT/IoT | Managed users |
Decision table
Windows domain laptop → ISE only (Forescout inspect). Camera → Forescout classify, optional Virtual FW or MAB in ISE — pick one. PLC → inspect only unless OT signed a control window.
Actions
How you enable one
Side A — write the owner
Spreadsheet: VLAN/port range → ISE or Forescout.
Side B — enable one action
Notify week, then one control on one camera.
Side C — prove
Host log shows one action. Switch session does not also show a conflicting ISE VLAN change.
Four enforce failures
1 · Dual owners
2 · Virtual FW without response NIC
3 · 802.1X on PLC
4 · Control before classify
How to prove it
1) Written owner. 2) One action in the log. 3) Camera still reaches NVR. 4) Priya still does ISE 802.1X, not Virtual FW.
Traps
| Wrong | Right |
|---|---|
| Both products “just in case” | One owner |
| Virtual FW = stealth ASA | It is NAC control, not a perimeter FW |
Knowledge check
Judgment items. One best answer. Reasons send you back to the matching section.
Forescout class series: Three products · First day · Discovery · Classification · Policy · Enforcement · Switch plugin · eyeExtend · OT / IoT · vs ISE + interview
Sources
- Forescout NAC / eyeControl enforcement methods.
- Cisco ISE series lessons 5–6.
Related: Forescout evidence desk · session factory · Cisco ISE series.