Feature Request: Preference in bird

[Maria Matejka]

You basically shouldn't do it. BIRD does something like last-resort pointer comparison and we should probably even add a warning if somebody misconfigures in this way.

Maria

On 14 June 2023 15:54:13 CEST, "Marek Küthe" <m-k-mailling-list at mk16.de> wrote:
>Thanks for the answer.
>
>What happens when the preference is the same for two different protocol
>types - which protocol is preferred? For example, if you have the
>preference of BGP and Babel routes both set to 100, which route will be
>chosen? BGP and Babel routes can't really be compared since BGP takes
>the AS path and Babel takes the metric as the main decision criterion.
>
>On Wed, 14 Jun 2023 13:05:15 +0200
>Bernd Naumann <bernd at kr217.de> wrote:
>
>> On 14.06.23 12:20, Marek Küthe wrote:
>> > On Wed, 14 Jun 2023 11:52:38 +0200
>> > Bernd Naumann <bernd at kr217.de> wrote:
>> >   
>> >> On 14.06.23 11:29, Marek Küthe wrote:  
>> >>> Is it possible to view the preference using "birdc"?    
>> >>
>> >> `birdc show route` shows the protocol preference at the end of the line
>> >> in brackets. Or do you mean something different, like when showing the
>> >> protocols?  
>> > 
>> > ```
>> >                      unicast [brandweb_v4 17:31:34.208] (100)
>> >                      [AS4242422032i] via 172.20.191.129 on brandweb
>> > ```
>> > So that would have a preference of 100, right?  
>> 
>> Yes.
>> 
>> > 
>> > ```
>> > fd04:234e:fc31::/128 unicast [inner_network 2023-06-13] (130/1)
>> > [00:00:00:00:ac:16:95:e2] via fe80::2923:1 on p2prouter
>> > ```
>> > And what would be the preference 130 with a Babel metric of 1?
>> >   
>> 
>> Yes. 130 is the default preference for babel.
>> 
>> >> `show protocols all`, does show the preference, too.  
>> > 
>> > Where exactly? I could not find anything there.
>> >   
>> 
>> ```
>> # birdc show protocols all
>> # Shows all configured protocols, their state, details, etc, including
>> preference.
>> 
>> # To view a single protocol:
>> # birdc show protocols all ospf_ipv6
>> BIRD 2.0.8 ready.
>> Name       Proto      Table      State  Since         Info
>> ospf_ipv6  OSPF       master6    up     2023-04-14    Running
>>   Channel ipv6
>>     State:          UP
>>     Table:          master6
>>     Preference:     150
>>     ...
>> ```
>> 
>
>
>-- 
>Marek Küthe
>m.k at mk16.de
>er/ihm he/him

-- 
Maria Matejka (she/her) | BIRD Team Leader | CZ.NIC, z.s.p.o.
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