Re: Scaling BFD support

[Arnold Nipper]

Douglas




These are the parameters the participants agreed upon

 * Interval: 500ms - 1500ms
 * Multiplier: 3 or 5
 * Passive: on
 * Idle_tx: 3x Interval
 * Auth: none


Greetings
Arnold

On 18.06.2022 13:47, Douglas Fischer wrote:

there was a workshop on "BFD at IXes" at the recent Euro-IX Forum in Tampere.

Hello all!

Just passing here to see if any moves on this BFD Scaling occurred.



Now you are probably asking:
What that has to do with Scale the BFD capacities on BIRD?

Well...



Then would be reasonable to lock the timers of BGP Session in 60/180.

This week some friends that are involved in the operation of a really big IXP told me that they were having problems with some "funny" participants of its IXP that adjusted their BGP Timer to numbers like 5/15. On an environment with thousands of peers, I'm sure you can imagine the CPU impact of that. Those 'j'enius are probably adjusting the timers to have some kind of control of some communication issue occurs between his router and the RS. They just "forget" that on that level of reduction, it compromises the processing capacity of the RS. If BFD engine could support session for every participant at IXP, or at least for those that wants that kind of resource. Em sex., 1 de abr. de 2022 às 13:41, Ondrej Zajicek <santi...@crfreenet.org <mailto:santi...@crfreenet.org>> escreveu:

    On Fri, Apr 01, 2022 at 08:44:50AM -0300, Douglas Fischer wrote:
     > The question raised by colleague Irene reminded me of a topic
    that may or
     > may not be the focus of BIRD's development.
     >
     > I imagine that the biggest supporters of SMP/Multi-Core/Thread-Safe
     > evolution on BIRD are Operators of Route-Servers of large IXPs, and
     > operators of large-scale Route-Reflectors.
     >
     > Although BFD has its greatest use in the transport network and
    Underlay, it
     > is increasingly common to see the use of BFD in BGP Internet.
     >
     > I'm personally overly excited about what BIRD version 3 is
    demonstrating in
     > terms of vertical scalability.
     >
     > But I keep imagining that, even having scalability in the BGP
    engine, it is
     > almost prohibitive to use BFD in a scenario with a thousand BGP
    Peers.
     >
     > Is there any view from the IBRD development team for this matter?
     > Or even... Is there any open project focused on BFD that can
    address this?

    Hmm, that is a good point. It would make sense to have multiple BFD
    threads, but i think that it is more a question of improving I/O loop
    performance in BIRD, as thousand peers with 100ms period is about 10
    kpps
    UDP rate, which should be manageable even from a single thread. We
    should
    make some effort to do some benchmarking for BFD.



    Ondrej 'Santiago' Zajicek (email: santi...@crfreenet.org
    <mailto:santi...@crfreenet.org>)
    OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3,
    wwwkeys.pgp.net <http://wwwkeys.pgp.net>)
    "To err is human -- to blame it on a computer is even more so."



--
Douglas Fernando Fischer
Engº de Controle e Automação

-- Elen sila lumenn' omentielvo

--
Keep calm, keep distance, keep connected!

Arnold Nipper
email: arn...@nipper.de
mobile: +49 172 2650958

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