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List:       bird-users
Subject:    Re: duplicate device routes on linux
From:       ico <ico () petrzalka ! net>
Date:       2023-02-20 18:19:27
Message-ID: 25b9e61c-4f57-49ff-c564-d389dd91335c () petrzalka ! net
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Heh that's my current solution - I just ignore it :)
(although it didn't seem the correct thing to do)

Thanks for your answer.

ico

On 20. 2. 2023 16:40, Ondrej Zajicek wrote:
> On Mon, Feb 20, 2023 at 02:47:39PM +0100, ico wrote:
>> Hello all,
>>
>> Here at $work we are using bird for OSPF at some 30 linux boxes. Works
>> great. But there is a thing that confuses me:
>> ...
>> When I run bird with this configuration, it inserts another route:
>>
>> # ip route
>> 10.0.0.0/24 dev eth0 proto kernel scope link src 10.0.0.1
>> 10.0.0.0/24 dev eth0 proto bird scope link metric 32
>>
>> Is this expected/correct behaviour? Or should I somehow filter those device
>> routes out? I want those device routes to be read by OSPF, of course, just
>> not to output them back. What is the best way to get rid of them?
> 
> Hello.
> 
> It is expected behavior. OSPF protocol computes best routes for all
> networks in the OSPF domain, that includes routes to directly attached
> networks (which are usually the direct routes, although in principle OSPF
> could find indirect route with lower metric even for directly attached
> network). You can just ignore them.
> 
>> Another unrelated question: When I run bird, it logs this:
>>
>> bird: KRT: Netlink strict checking failed, will scan all tables at once
>> bird: Started
>>
>> Should I do something about that failed strict check? Is it important or
>> only some info message I shouldn't worry about?
> 
> That is just old version of Linux kernel. It should work ok even with
> this warning.
> 
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