Is there any way to set different communities while importing prefixes?

[Hugo Slabbert]

You can set route attributes when defining static routes.

E.g. we stamp route preference onto sets of static routes (faked out
example):

protocol static MY_STATIC_PROTO {
    route 192.0.2.0/24 via 10.0.0.1 {
        bgp_med = 90;
        preference = 101;
    };
}

I haven't tried setting BGP communities directly on static routes there,
but give it a shot? Alternatively, if you want to set an alternate
arbitrary tag, maybe you want to create a custom attribute (
https://bird.network.cz/?get_doc&v=20&f=bird-5.html#ss5.5) that you mark on
your static routes, that can be read on BGP export to decide which
communities to apply?

On Wed, Apr 12, 2023 at 4:51 PM Alexander Zubkov via Bird-users <
bird-users at network.cz> wrote:

> Hi,
>
> Just look at the docs:
> https://bird.network.cz/?get_doc&v=20&f=bird-6.html#ss6.14
> <https://isolate-menlo.menlosecurity.com/0/eJyrViotylGyUsooKSkottLXT8osStHLSy0pzy_K1kuu0rdPTy2JT8lPViuzNTJQS7MFyeua6WWU5OYoFxeb6RmaKOkoFeUrWRnqKJVkpgBNMjSxNFeqBQAflBt9>
>
>
> On Wed, Apr 12, 2023, 23:57 Valery Lutoshkin <vpluto at gmail.com> wrote:
>
>> Hi,
>>
>> I use Bird 2.0.9 to spread a special list of prefixes (about 100k) via
>> BGP to an unknown list of users (around 1k).
>>
>> The prefixes are supposed to be marked by different communities (6 right
>> now) and receivers should be able to filter them by those communities to
>> use only prefixes they want.
>>
>>
>> While only one community should be attached to the prefix, I use just 6
>> different files with prefixes and attach the proper community in the import
>> processes like this:
>>
>> protocol static importbgp_1 {
>>
>>         ipv4 { import filter {bgp_community.add((65000,1)); accept;}; };
>>
>>         include "/tmp/prefixes_1.txt";
>>
>> }
>>
>> Lines in the prefixes_1 file look like this:
>>
>> route 1.3.7.7/32
>> <https://isolate-menlo.menlosecurity.com/0/eJyrViotylGyUsooKSmw0tc31DPWM9cz1zc2UtJRKspXsjLUUSrJTAEqMDSxNFeqBQAzAgwW>
>> unreachable;
>>
>>
>> But when I need to attach several communities to the prefixes, I have to
>> create 2^6=64 different static protocols and generate 64 different files.
>>
>> And for 8 communities I will have to create 256 protocols and files.
>>
>>
>> If I could add some marks to routes in the imported file, I would use
>> those marks in the import filter to attach communities to the prefix.
>>
>>
>> But if I’m not mistaken, there is no way of doing that.
>>
>>
>> If there is a different solution to this issue that I’m unaware of, would
>> you please let me know.
>>
>>
>> Best regards,
>>
>> Valery
>>
>
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