I can't believe that never occurred to me in all the time I was doing that, 'way back when... <facepalm> Thanks for pointing that out! -Adam
Adam Thompson Consultant, Infrastructure Services MERLIN 100 - 135 Innovation Drive Winnipeg, MB R3T 6A8 (204) 977-6824 or 1-800-430-6404 (MB only) https://www.merlin.mb.ca Chat with me on Teams: athomp...@merlin.mb.ca > -----Original Message----- > From: NANOG <nanog-bounces+athompson=merlin.mb...@nanog.org> On > Behalf Of Brandon Martin > Sent: October 21, 2022 4:30 PM > To: nanog@nanog.org > Subject: Re: any dangers of filtering every /24 on full internet > table to preserve FIB space ? > > 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