Comprehensive and Detailed Explanation From Exact Extract of Forescout Platform Administration and Deployment:
According to the Forescout Licensing and Sizing Guide and Failover Clustering Licensing Requirements documentation, the correct statement is: For member appliances, HA and Failover Clustering are part of Resiliency licensing.
Resiliency Licensing for Member Appliances:
According to the Failover Clustering Licensing Requirements documentation:
"To begin working with Failover Clustering, you need a license for the feature. The license required depends on which licensing mode your deployment is using."
When using FLEXX licensing with member appliances:
High Availability (HA) - Part of Resiliency licensing
Failover Clustering - Part of Resiliency licensing (called "eyeRecover License")
Disaster Recovery - Separate from member appliance resiliency
Resiliency License Components:
According to the documentation:
"When using Flexx licensing, Failover Clustering functionality is supported by the Forescout Platform eyeRecover license (Forescout CounterACT Resiliency license)."
The Resiliency license covers:
FLEXX Licensing Model:
According to the Licensing and Sizing Guide:
"Flexx Licensing: Licenses are independent of hardware appliances, providing an intuitive and flexible way to license, deploy and manage Forescout products across your extended enterprise."
Why Other Options Are Incorrect:
A. Can be installed on all CTxx and 51xx models - FLEXX is for 5100/4100 series and later; CT series supports per-appliance licensing only
B. Disaster Recovery is used for member appliances - Disaster Recovery is separate; member appliances use HA/Failover Clustering from Resiliency license
D. Changing via Customer Portal - Changes from per-appliance to FLEXX must be done through official Forescout channels, not self-service Customer Portal
E. Failover Clustering is used with EM and RM - Failover Clustering is for member appliances; EM has separate HA capability
Referenced Documentation:
Failover Clustering Licensing Requirements v8.4.4 and v9.1.2
Forescout Licensing and Sizing Guide
Switch from Per-Appliance to Flexx Licensing