nanog mailing list archives
Re: Dual Homed BGP
From: Jon Lewis <jlewis () lewis org>
Date: Fri, 24 Jan 2020 18:39:14 -0500 (EST)
On Fri, 24 Jan 2020, Baldur Norddahl wrote:
Full tables will not make much noticeable difference if you are not peering. However you want to make sure both links get used. It can be a 90%/10% split but 100%/0% is bad because then you may discover that the alternate path is actually broken the moment the primary fail. If you choose only default then you need to think about that. If you join any peering exchanges, full tables will be mandatory. Some parties will export prefixes and then expect a more specific prefix received from your transit to override a part of the space received via the peering.
90/10 will suck when the link carrying 90% of your traffic needs more pipe and you have a ton of unused capacity on the other one. Full tables from both providers gives you more options to tune things (assuming outbound is your larger direction). If you're an eyeball provider and most of your traffic is inbound, your outbound traffic routing decisions aren't quite as relevant.
Have those suggesting "multihoming with two partial feeds and default routes" forgotten peering pissing matches, long lasting inter-network capacity issues, or that certain "tier 1" providers don't even have/provide a full v6 table?
If you're going to multihome, do it right, and get full routes from all your providers.
---------------------------------------------------------------------- Jon Lewis, MCP :) | I route StackPath, Sr. Neteng | therefore you are _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
Current thread:
- Dual Homed BGP Brian (Jan 24)
- Re: Dual Homed BGP Mel Beckman (Jan 24)
- Re: Dual Homed BGP Ben Cannon (Jan 24)
- Re: Dual Homed BGP Cummings, Chris (Jan 24)
- Re: Dual Homed BGP Ben Cannon (Jan 24)
- Re: Dual Homed BGP Job Snijders (Jan 24)
- Re: Dual Homed BGP Chriztoffer Hansen (Jan 24)
- Re: Dual Homed BGP Amir Herzberg (Jan 27)
- Re: Dual Homed BGP Jay Hennigan (Jan 24)
- Re: Dual Homed BGP Gavin Henry (Jan 24)
- Re: Dual Homed BGP Baldur Norddahl (Jan 24)
- Re: Dual Homed BGP Jon Lewis (Jan 24)
- Re: Dual Homed BGP Baldur Norddahl (Jan 24)
- Re: Dual Homed BGP Tore Anderson (Jan 25)
- Re: Dual Homed BGP Baldur Norddahl (Jan 25)
- RE: Dual Homed BGP Aaron Gould (Jan 25)
- Re: Dual Homed BGP Anurag Bhatia (Jan 27)
- Re: Dual Homed BGP Jon Lewis (Jan 24)
- Re: Dual Homed BGP Mel Beckman (Jan 24)