Sander, How big? How slow? You can reply to me off or on list. About 8 to 10 years ago, we had a large effort to improve this. Now customers push many megabytes of prefix-sets several times a day and it works. I have sent some questions internally to get a better answer. Related, in 7.2.1, we added the as-set, which allows you to filter BGP routes by origin-as. It is similar to as-path-set. as-path-set is slow, using a linear lookup, but it is versatile, allowing ios-regex. as-set can only use numbers and only for origin-as, but it is fast using a log(N) lookup. Regards, Jakob. -----Original Message----- Date: Fri, 9 Dec 2022 00:02:52 +0100 From: Sander Steffann <sander@steffann.nl> Hi, What is the best/most efficient/most convenient way to push large prefix lists or sets to an XR router for BGP prefix filtering? Pushing thousands of lines through the CLI seems foolish, I tried using the load command but it seems horribly slow. What am I missing? :) Cheers! Sander --- for every complex problem, there?s a solution that is simple, neat, and wrong