Unfortunately, that's how it's done in route policy on XR, so people bouncing between flavors can easily make that mistake. On 4/13/18, 4:15 AM, "NANOG on behalf of Bjørn Mork" <nanog-bounces@nanog.org on behalf of bjorn@mork.no> wrote: Anurag Bhatia <me@anuragbhatia.com> writes: > Similar for AS2. I believe we've seen bogus low AS number announcements a few times before, and they've usually been caused by attemts to configure AS path prepending without understanding and/or reading the docs. Someone might have wrongly assumed that set as-path prepend 133711 133711 could be written shorter like set as-path prepend 133711 2 and there you go... Bjørn