Route Flapping and Bird - RFD and MRAI

[Douglas Fischer]

Passing by here to drop another ping on the MRAI - Minimum Route
Advertisement Interval in the BIRD, and also on the RFD -
Route-Flap-Dampening.

Em qui., 8 de jul. de 2021 às 17:18, Douglas Fischer <
fischerdouglas at gmail.com> escreveu:

> Hello all.
>
> Last weeks I'm noticing the increase the increase of BGP messages on some
> routers that I have access to.
> Specially those connected to IXPs with a considerable number of
> participants.
> I Checked and the BGP process has increased a bit the use of CPU Also.
> So, I suspect that Route-Servers are receiving and forwarding Route Flaps
> from one or more participants...
>
> I know that the right place to fix that would be on the source of those
> flaps...
> But... Considering IXPs with one ou two thousand participants, there will
> always be someone flapping some routes.
>
> Bird is widely used as the BGP engine on IXP route-servers.
> And exactly because of that I came here to ask about Route Flap avoidance
> mechanisms on Bird.
>
> The discussion of methods to avoid Route Flapping in BGP is very
> controversial.
>  - RFD - Route Flapping Dampening comes and goes.
>  - MRAI is not a consensus, but there is a lot of effort on that,
> including som magic algorithms define some variable interval according to
> conditions.
>  - I even saw some ultra-rigorous ideas like rate limiting the BGP
> messages...
>
> Before I come here to bore you with this, I searched a bit on mail list
> and documentation of Bird and I found the links bellow related to that:
>
> There is any work running to deal with that route-flapping question?
>
> https://bird.network.cz/ - 7.1 Future work
> <https://bird.network.cz/?get_doc&v=20&f=bird-7.html>
> Question about BGP advertisement-interval in BIRD
> <http://trubka.network.cz/pipermail/bird-users/2020-August/014786.html>
> [BGP] MRAI connection-based implementation review
> <http://trubka.network.cz/pipermail/bird-users/2020-April/014433.html>
> Route Flap Dampening
> <http://trubka.network.cz/pipermail/bird-users/2019-July/013589.html>
> [BGP] bird and RFD
> <http://trubka.network.cz/pipermail/bird-users/2020-May/014612.html>
>
> Thank you all!
>
> --
> Douglas Fernando Fischer
> Engº de Controle e Automação
>


-- 
Douglas Fernando Fischer
Engº de Controle e Automação
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