nanog mailing list archives
Re: BGP prefix filter list
From: Blake Hudson <blake () ispn net>
Date: Wed, 22 May 2019 08:14:46 -0500
adamv0025 () netconsultings com wrote on 5/22/2019 3:23 AM:
Thanks Adam! For the life of me I could not remember where I read that information or what platform it applied to. I do recall it being a very transparent view into TCAM organization and I appreciated the insight. It was also a good reminder that it pays to understand your platform as I had previously (naively) thought that a 1M capacity FIB could hold 1M entries with any mask size, whether those be 1M /32 entries (a BRAS with 1M PPP/BNG subscribers) or 1M /24 or bigger entries (a BGP edge router). This was obviously not the case on that platform.From: NANOG <nanog-bounces () nanog org> On Behalf Of Blake Hudson Sent: Monday, May 20, 2019 4:35 PM As I recall reading about one vendor's platform (the ASR9k perhaps?) and its TCAM organization process, it stored /32 routes in a dedicated area for faster lookups and did the same for /24 routes.Yes that was true for the first generation (trident based) line-cards and is no longer the case anymore. adam
Current thread:
- Re: BGP prefix filter list, (continued)
- Re: BGP prefix filter list Karsten Elfenbein (May 17)
- Re: BGP prefix filter list Jon Lewis (May 15)
- Re: BGP prefix filter list Karsten Elfenbein (May 15)
- Re: BGP prefix filter list Radu-Adrian Feurdean (May 15)
- Re: BGP prefix filter list Tom Beecher (May 15)
- Re: BGP prefix filter list Alejandro Acosta (May 18)
- 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 Amir Herzberg (May 18)
- Re: BGP prefix filter list Jared Brown (May 17)
- Re: BGP prefix filter list Jörg Kost (May 17)
- Re: BGP prefix filter list Scott Weeks (May 30)
- Re: BGP prefix filter list Valdis Klētnieks (May 30)
- Re: BGP prefix filter list Scott Weeks (May 30)