BIRD Journey to Threads: Chapter zero of a blogpost series

[Douglas Fischer]

Hello, Maria and everyone on the list...
This is Great News! I'm so happy to receive that mail!

That part about "Filter Rework" made me a bit anxious!
I don't know exactly means the part:
 "we decided to preprocess the filter internal structure to another
structure which is much easier to execute"...
But, to me, it sounds like fragmenting, even more, the "test, mark, and
actuate" on the filters... Right?


Talking about BGP, I love Bird because only with it I know how to do what I
call "2 cycles filtering"...

- I create several Small Tests, where each route is tested and marked
somehow...
- On each Peer-Type, import or export(but mostly on import), and I define
which tests will be called to be executed on that route, and live their
mark on each route.
  - I here I test, Mask-lenght, AS-Set, AS-Origin, AS-Path,
foreigner-communities, internal-communities, a lot of Regex, and all those
multiple complex things...
- And at the end of the filter-police I do an "IF" that tests on a combined
And+Or the marks lived by the previous tests, and based on that do the
accept, reject, add-communities, adjust MED/Local-Pref/Etc...


That thing with "Lua scripts" that you mentioned, would be something like
what I described?


Thanks in advance!


Em seg., 15 de mar. de 2021 às 07:44, Maria Matejka <maria.matejka at nic.cz>
escreveu:

> Hello!
>
> As we're working on multithreading support in BIRD, there is a need to
> document this. There is a user documentation (which almost doesn't
> change) and a programmer's documentation composed mostly of comments
> spread across the source code.
>
> There is also a kind-of high-level documentation to describe how are the
> BIRD's internal processes changing. If you're just an ordinary user, you
> don't need to care much about that. We're sharing this mostly for people
> who know (or want to know) how BIRD works internally and how it is going
> to change.
>
> The zeroth chapter is here, other chapters should follow soon:
>
>
> https://en.blog.nic.cz/2021/03/15/bird-journey-to-threads-chapter-0-the-reason-why/
>
> (Content: An introduction and summary of previous major BIRD structural
> changes.)
>
> I deeply appreciate your feedback and questions.
>
> Maria
>


-- 
Douglas Fernando Fischer
Engº de Controle e Automação
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