nanog mailing list archives
Re: Consistent routing policy?
From: Töma Gavrichenkov <ximaera () gmail com>
Date: Mon, 16 Sep 2019 12:55:55 -0700
Peace, On Mon, Sep 16, 2019, 12:04 PM Owen DeLong <owen () delong com> wrote:
For any router which receives both announcements, longest match always wins over all other BGP tie-breaking criteria. This is almost always summarized as “Longest Match always wins” because virtually any engineer recognizes that the winner is selected only from the available contestants, not from unknown distant contestants not present at the router in question.
The point is that you must expect inbound traffic to any prefix you advertise to the outside world, even a more specific announcement is also being advertised. There are legitimate circumstances where an ISP would prefer the super-block. -- Töma
Current thread:
- Re: Consistent routing policy?, (continued)
- Re: Consistent routing policy? Mark Tinka (Sep 16)
- Re: Consistent routing policy? Ben Logan (Sep 16)
- Re: Consistent routing policy? Mark Tinka (Sep 16)
- Re: Consistent routing policy? Ben Logan (Sep 16)
- Re: Consistent routing policy? Arie Vayner (Sep 16)
- Re: Consistent routing policy? Martijn Schmidt via NANOG (Sep 16)
- Re: Consistent routing policy? Ross Tajvar (Sep 16)
- Re: Consistent routing policy? Niels Bakker (Sep 16)
- Re: Consistent routing policy? Ben Logan (Sep 16)
- Re: Consistent routing policy? Mark Tinka (Sep 16)
- Re: Consistent routing policy? Töma Gavrichenkov (Sep 16)
- Re: Consistent routing policy? Owen DeLong (Sep 16)
- Re: Consistent routing policy? Töma Gavrichenkov (Sep 16)
- Re: Consistent routing policy? Mark Tinka (Sep 17)
- Re: Consistent routing policy? Mark Tinka (Sep 17)