Route Flapping and Bird - RFD and MRAI

[Tiago Felipe Goncalves]

Really nice read that! =D

+1 for MRAI/route flap dampening.


Vriendelijke groeten,

Tiago Felipe Gonçalves
PGP Fingerprint -
A2:82:BD:48:EE:8D:C4:99:C2:4E:81:D4:C4:7B:1C:2E:C7:F3:04:C9

On 14-02-2022 21:01, Ondrej Zajicek wrote:
> On Mon, Feb 14, 2022 at 10:48:40AM -0300, Douglas Fischer wrote:
>> 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.
> Hi
>
> Several people ask us recently about MRAI / route flap damping, we
> will likely put some effort to implement it.
>
> There are two basic ways how to do it:
>
> 1) In export-part of BGP protocol, where prefixes are stored to transmit,
> in a per-peer way. This is AFAIK how RFC 4271 assumed MRAI works. It could
> be configured per-peer, but has disadvantage that it requires memory for
> routes pushed for export but postponed for MRAI (these are stored separatedy
> for each peer).
>
> 2) In routing table, by temporarily 'suspend' paths that change too often (so
> they cannot be elected as best paths). This is AFAIK how RFC 2435 Route flap
> damping works.
>
> Seems to me that both approaches make sense even together. We will
> discuss that internally to see how we will implement that.
>