This is comparatively new change in RFC6286 (2011, which in RFC time is last weekish)
Prior to RFC6286 router-id had to be globally unique. On Tue, 18 Nov 2025 at 15:22, Dale W. Carder via NANOG <[email protected]> wrote: > > Thus spake Randy Bush ([email protected]) on Tue, Nov 18, 2025 at 02:55:07PM > +0900: > > > In our measurement/monitoring systems we do record the BGP router ID of > > > every neighbor. This is handy as it should[*] be unique to an AS > > > > uh, my memory is that the spec is that it is unique WITHIN an AS. two > > ASs can have routers with the same routerID. > > doh! yes, typo on my part. > > Dale > _______________________________________________ > NANOG mailing list > https://lists.nanog.org/archives/list/[email protected]/message/VWKDZ6WTEQL2L2H6PN5QR4VPK6SZF557/ -- ++ytti _______________________________________________ NANOG mailing list https://lists.nanog.org/archives/list/[email protected]/message/STZCE5GNOMWLSMHBYGXH7AJY5KWXRWDS/
