Dell Force10 C150 Configuration Manual page 401

FTOS Behavior: When or is enabled, and the respective process restarts,
debug tacacs debug radius
FTOS does not continue to print debug messages after the restart; you must execute or
debug tacacs
again. This is because debugging is not saved to the running configuration, rather, FTOS
debug radius
marks the process for debugging with a flag that is cleared during the restart.
High Availability | 401