overriding static routes in FreeBSD

[Marek Zarychta]

W dniu 15.06.2021 o 16:04, Alexander Zubkov pisze:
> Oh, looks like FreeBSD does not have metric for the routes. So yes, it
> is not the possibility then.
> 
Probably it can be done. FreeBSD routing stack was significantly
changed[1] during last year. It gained support for ECMP[2] via nexthop
groups[3] and all routes have weigths[2] now. Likely only FRR received
some updates to support this new routing stack.

> On Tue, Jun 15, 2021 at 3:24 PM Ondrej Zajicek <santiago at crfreenet.org> wrote:
>>
>> On Tue, Jun 15, 2021 at 02:50:09PM +0200, Alexander Zubkov wrote:
>>> Hi,
>>>
>>> I think it is intentional so that bird should not meddle with "foreign"
>>> routes. In Linux, for example, it uses it's own protocol label and
>>> does not touch other routes. It can import them, but does not change them.
>>
>> Hi
>>
>> Yes, that is true.
>>
>>
>>> In your situation, I think the optimal solution is to have your
>>> original default routes with some high metric, so that bird's default
>>> should override it later. In that case it will not need to replace
>>> routes it does not own, because usually you can have routes with the
>>> same prefix but different metrics simultaneousely in your routing
>>> table.
>>
>>
>> That works in Linux, but i do not think it works in FreeBSD. AFAIK there
>> is only one route per network there.
>>
>> Using -proto1 -nostatic for route is an easy way how to workaround this
>> issue on BSD.
>>
>> --
>> Elen sila lumenn' omentielvo
>>
>> Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
>> OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
>> "To err is human -- to blame it on a computer is even more so."

[1] https://reviews.freebsd.org/D24141
[2] https://reviews.freebsd.org/D26449
[3] https://reviews.freebsd.org/D24232

-- 
Marek Zarychta

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