This object specifies which SGT-caching mode is configured
for SGT caching capable interfaces at the managed system.
'none' indicates that sgt-caching for all Layer 3
interfaces (excluding SVIs) is disabled.
'standAlone' indicates that SGT-caching is enabled on
every TrustSec capable Layer3 interface (excluding SVIs)
in the device.
'withEnforcement' indicates that SGT-caching is enabled on
interfaces that have RBAC enforcement enabled.
'vlan' indicates that SGT-caching is enabled on
the VLANs specified by ctspSgtCachingVlansfFirst2K &
ctspSgtCachingVlansSecond2K