nanog mailing list archives
Re: Max Prefix Out, was Re: Verizon 701 Route leak?
From: "Jörg Kost" <jk () ip-clear de>
Date: Thu, 31 Aug 2017 15:21:44 +0200
Hi,but in reality you will factorise and summarize outbound and inbound numbers, create spare room for sessions and failover scenarios and therefore leaks and especially partial leaks can still occur.
In another example scenario the BGP process may not only shutdown the session to B, that has run into an outbound warning, but all other sessions to prevent "leaks". Last-resort the router will only judge by the number of the prefixes and therefore could shutdown himself by accident, especially if this router was not the origin. That could be a global headache ;-)
Jörg On 31 Aug 2017, at 13:06, Job Snijders wrote:
Dear Jörg, On Thu, Aug 31, 2017 at 12:50:58PM +0200, Jörg Kost wrote:but isn't peer A prefix-out a synonym for peer B prefix-in, that will lead to the same result, e.g. a BGP teardown? I just feel that this will add another factor, that people will not use or abuse: neigh $x max-out infiniteI feel you may be overlooking a key aspect here: Currently all of us rely on our peer's 'inbound maximum prefix limit', and obviously theseare not always set correctly. An 'outbound maximum prefix limit' offersnetworks that care about the rest of the world the option to 'self-destruct' the EBGP session in order to protect others.
Current thread:
- Max Prefix Out, was Re: Verizon 701 Route leak? Michael Still (Aug 29)
- Re: Max Prefix Out, was Re: Verizon 701 Route leak? Alejandro Acosta (Aug 30)
- Re: Max Prefix Out, was Re: Verizon 701 Route leak? Jörg Kost (Aug 31)
- Re: Max Prefix Out, was Re: Verizon 701 Route leak? Job Snijders (Aug 31)
- Re: Max Prefix Out, was Re: Verizon 701 Route leak? Jörg Kost (Aug 31)
- Re: Max Prefix Out, was Re: Verizon 701 Route leak? Michael Still (Aug 31)
- Re: Max Prefix Out, was Re: Verizon 701 Route leak? Jörg Kost (Aug 31)
- Re: Max Prefix Out, was Re: Verizon 701 Route leak? Leo Bicknell (Aug 31)
- Re: Max Prefix Out, was Re: Verizon 701 Route leak? Christopher Morrow (Aug 31)
- Re: Max Prefix Out, was Re: Verizon 701 Route leak? Alejandro Acosta (Aug 30)
- Re: Max Prefix Out, was Re: Verizon 701 Route leak? Tassos Chatzithomaoglou (Aug 31)