Question about babel over bird

[Oriol Rico]

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

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?

Thanks

Oriol

El El jue, 12 ene 2023 a las 16:11, Juliusz Chroboczek <jch at irif.fr>
escribió:

> >     We have a series of wireless antennas deployed in mesh with the babel
> > protocol using bird.
> >    Two of those antennas advertise the route 10.0.0.0/8.
> >    The rest of the antennas choose one of the two outputs depending on
> the
> > babel protocol.
> >    How can I force it to go out through one or the other exit?
>
> You cannot force it, but you can strongly discourage one of the two nodes.
> Say something like this:
>
>     filter babel_discourage {
>             if babel_metric < 1024 then
>                     babel_metric = 1024;
>             accept "ok";
>     };
>
>     protocol babel {
>             ...
>             ipv4 {
>                     export filter babel_discourage;
>             };
>             ipv6 {
>                     export filter babel_discourage;
>             };
>     };
>
> You should not do the opposite: a node can safely increase the metric it
> announces, thus discouraging its use by other nodes, but it should not
> decrease its metric artificially, since that might defeat Babel's loop
> avoidance.
>
> -- Juliusz
>
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