Remove all except one community

[Alexander Zubkov]

Hi,

That is exactly what "filter" function does. Something like this:
bgp_community.filter([(64511,*)]);


On Wed, Jul 19, 2023, 17:15 Marek Küthe <m-k-mailling-list at mk16.de> wrote:

> Hello,
>
> I recently discovered a new filter for myself on
> https://bgpfilterguide.nlnog.net/guides/many_communities/#bird. In my
> eyes it also makes sense to keep the routing table as small as
> possible. But now I don't want to delete all communities, but keep a
> single one. How can I implement something like that?
> ```
> function strip_too_many_communities() {
>     if ( ( bgp_community.len + bgp_ext_community.len +
> bgp_large_community.len ) >= 100 ) then {
>         bgp_community.empty.except((64511, *));
>         bgp_ext_community.empty;
>         bgp_large_community.empty;
>     }
> }
> ```
>
> The background is that these serve in the
> [dn42](https://dn42.dev/howto/Bird-communities) as information, how
> good the connection to the destination is. Therefore I would like to
> keep these.
> Does anyone have any ideas on how to do something like this?
>
> Greetings
> Marek Küthe
>
> --
> Marek Küthe
> m.k at mk16.de
> er/ihm he/him
>
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