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The only logical answer is to configure AS_PATH prepend for the current best path.
Higher local pref is preferred so the current answer seems incorrect?
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When you change the CURRENT best path, how do you know that it will choose the wished route as alternative best path?
I think you need to modify the wished route (for example configure a higher local preference).
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"Configure lower LOCAL_PREF to select as the best path."
In the BGP path selection process, a higher LOCAL_PREF is preferred. By lowering the LOCAL_PREF for the path from 10.57.255.11 (the current best path), we make it less preferred, and the path from 10.77.255.57 may become the new best path.