nanog mailing list archives
Re: BGP prefix filter list
From: Tom Beecher <beecher () beecher cc>
Date: Wed, 15 May 2019 15:20:42 -0400
At a previous company , about 10-ish years ago, had the same problem due to equipment limitations, and wasn't able to get dollars to upgrade anything. The most effective thing for me at the time was to start dumping any prefix with an as-path length longer than 10. For our business then, if you were that 'far away' , there wasn't any good reason for us to keep your route. Following default was going to be good enough. It's still a reasonable solution I think in a lot of cases to filter out a lot of the unnecessary prepend messes out there today. On Wed, May 15, 2019 at 7:45 AM Baldur Norddahl <baldur.norddahl () gmail com> wrote:
Hello This morning we apparently had a problem with our routers not handling the full table. So I am looking into culling the least useful prefixes from our tables. I can hardly be the first one to take on that kind of project, and I am wondering if there is a ready made prefix list or similar? Or maybe we have a list of worst offenders? I am looking for ASN that announces a lot of unnecessary /24 prefixes and which happens to be far away from us? I would filter those to something like /20 and then just have a default route to catch all. Thanks, Baldur
Current thread:
- Re: BGP prefix filter list, (continued)
- Re: BGP prefix filter list Ross Tajvar (May 15)
- Re: BGP prefix filter list Baldur Norddahl (May 15)
- Re: BGP prefix filter list mike . lyon (May 15)
- Re: BGP prefix filter list Baldur Norddahl (May 15)
- Re: BGP prefix filter list Mike Hammett (May 15)
- Re: BGP prefix filter list Ahad Aboss (May 16)
- Re: BGP prefix filter list Karsten Elfenbein (May 17)
- Re: BGP prefix filter list Amir Herzberg (May 18)
- Re: BGP prefix filter list Alejandro Acosta (May 18)
- Re: BGP prefix filter list Blake Hudson (May 20)
- RE: BGP prefix filter list adamv0025 (May 22)
- Re: BGP prefix filter list Blake Hudson (May 22)
- Re: BGP prefix filter list Jörg Kost (May 17)
- Re: BGP prefix filter list Valdis Klētnieks (May 30)