This counter counts roams within a mobility network-id that completed using Fast Secured authentication, the low-latency reauthentication method intended for handoffs like voice calls. Admins care about this figure because a low count relative to total roams may mean fast, secure roaming isn't actually being used by clients that need it, such as VoWLAN phones. For example, if voice quality complaints continue despite Fast Secure Roaming being configured, a stagnant cwdsiRoamMblGrpStatsFastSecured would suggest the phones are falling back to full reauthentication instead.