Brute force

You have plenty of options:

 

Both AFM and ASM provide brute force mitigation.

 

You can also use iRules from a purely LTM perspective. There are plenty of example irules on DevCentral if you run a search.

 

You might want to look at

 

Project BAIU

 

authors website for the latest version

 

I haven't fully tested those irules, so using them is at your own risk, but the author is staking money on them.