Hi @GFN182 ,
If I understand you correctly, I believe you are talking about "AS path prepending". This is commond technique used to design which path will be primary and which backup. If you recall from BGP path selection, route with shortest AS path will be prefer. In addition AS path is one of the first critieria which device will use to compare paths to same destination.
AS path prepend will copy the last AS from the path and append it n-times.
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