nanog mailing list archives
Re: Dual Homed BGP
From: Job Snijders <job () instituut net>
Date: Fri, 24 Jan 2020 18:23:39 +0100
Dear Brian, On Fri, 24 Jan 2020 at 17:40, Brian <brian.bsi () gmail com> wrote:
Hello all. I am having a hard time trying to articulate why a Dual Home ISP should have full tables. My understanding has always been that full tables when dual homed allow much more control. Especially in helping to prevent Async routes.
The advantage of receiving full routing tables from both providers is that in cases where one of the two providers is not yet fully converged, your routers will use the other provider for those missing destinations. This may happen during maintenance or router boot-up in your upstream’s network. Another advantage of receiving full routes is that you can manipulate LOCAL_PREF per destination, or compose routing policy based on per-route attributes such as BGP communities your upstreams set. It can happen that a provider is great for 99% of destinations, except a few - without full tables such granular traffic-engineering can be cumbersome. Virtually all internet routing is asymmetric, I wouldn’t consider that an issue. Am I crazy?
I dropped out of university, never completed my psychology studies, I fear I am unqualified to answer this question. ;-) Kind regards, Job
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 Jon Lewis (Jan 24)
- Re: Dual Homed BGP Mel Beckman (Jan 24)