RE: any dangers of filtering every /24 on full internet table to preserve FIB space ?

[Adam Thompson <athompson () merlin mb ca>]

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: athompson () merlin mb ca

> -----Original Message-----
> From: NANOG <nanog-bounces+athompson=merlin.mb.ca () 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