nanog mailing list archives
Re: any dangers of filtering every /24 on full internet table to preserve FIB space ?
From: Brandon Martin <lists.nanog () monmotha net>
Date: Fri, 21 Oct 2022 17:30:28 -0400
On 10/20/22 17:50, Adam Thompson wrote:
Alternately, a valid technique is to have a default route AND a partial BGP feed (a filtered full feed is by definition a partial feed). That helps optimize outbound routing a little bit, you still get the advantage - mostly - of multiple inbound carriers; but you still have to pick one carrier to do the heavy lifting for you. And you are paying them to route for you, so that's not an unfair shifting of the routing burden, unlike relying on covering routes. Note that this approach does NOT provide any redundancy, unlike having full BGP feeds.
As a note, you can get redundancy (but still none of the best-path advantages of having multiple transits) by asking your transits to originate default in their BGP feed and then selectively accepting it. You can either ECMP it or pick priority with localpref.
You need multiple full-view transits for this to work, though. -- Brandon Martin
Current thread:
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ?, (continued)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Stephane Bortzmeyer (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Stephane Bortzmeyer (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Brie (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Randy Bush (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? John Gilmore (Oct 10)
- RE: any dangers of filtering every /24 on full internet table to preserve FIB space ? Tobias Fiebig (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Geoff Huston (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? richey goldberg (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? David Bass (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Stephane Bortzmeyer (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Brandon Martin (Oct 21)
- RE: any dangers of filtering every /24 on full internet table to preserve FIB space ? Adam Thompson (Oct 24)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Jon Sands (Oct 27)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Jim Troutman (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Elmar K. Bins (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Mike Hammett (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? William Herrin (Oct 10)