Question about babel over bird

Toke Høiland-Jørgensen toke at toke.dk
Thu Jan 12 18:01:58 CET 2023


Juliusz Chroboczek <jch at irif.fr> writes:

>> But this filter applies in the antenna that advertise the route.
>> 10.20.2.2 and 10.20.2.36 advertise 10.0.0.0/8
>> 
>> 10.20.2.162 and 10.20.3.1 links with 10.20.2.2 and i want that 10.20.2.162 uses
>> 10.20.2.36 (not direct link) for 10.0.0.0/8 not 10.20.2.2 and 10.20.3.1 uses
>> 10.20.2.2
>
> For anyone who's lost:
>
>                  162
>                 /   \
>                /     \
>  Internet --- 2       36 --- Internet
>                \     /
>                 \   /
>                  3.1
>
> Oriol wants 162 to reach the Internet through 36 and 3.1 to reach the
> Internet through 2.
>
>> So i need to modify in 10.20.2.162 and 10.20.3.1 the 10.0.0.0/8 gateway
>> Is this possible with babel?
>
> It's possible with babeld (the standalone implementation of Babel), which
> allows filtering on router-id.  Toke will correct me if I'm wrong, but
> I don't think that the BIRD implementation can do that.

No, you're right, we don't export the router ID to filters. We could,
though, if there's demand for it :)

-Toke


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