12-15-2021 06:49 AM
I am using BGP between two ISP's. On one of them my AS number is listed one time by each prefix. On the other ISP my AS number is listed 6 times by each prefix. The ISP with 6 AS numbers is a lower preference.
Anyone know why?
12-15-2021 08:29 AM - edited 12-15-2021 08:32 AM
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.
12-15-2021 08:39 AM
It was a setting under one of our Export rules.
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