Hi Ray,
What ACS version you are using?
On a cisco switch the following command is used:
switch(config)# aaa authentication enable default tacacs+ enable
The above command is used to set the TACACS+ as the default check for the enable password. If TACACS+ is not available it will fall back to the local enable password.
You need to look into such option in the Brocade switch.
HTH
Amjad
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