Brocade operating systems
Real-time Operating System (RTOS)
Brocade uses Vxworks as Real-time Operating System
Brocade uses Linux Real-time Operating System
It directly communicates with the hardware
It loads at the initial boot
It Provides hardware interface and management services, such as SSH, HTTPS, SNMPv3, etc.
Fabric Operating System (FOS)
Fabric OS decides the behaviour of the switch.
It Provides Fabric Services and switch management functions