Add random number

[Maria Matejka]

In all cases, I'd appreciate a detailed description of the exact use case we are trying to solve. We may then come up with an appropriate solution, a workaround or a well-defined feature request.

Thank you for your understanding.
Maria

On 11 February 2024 09:30:50 GMT-05:00, Alexander Zubkov via Bird-users <bird-users at network.cz> wrote:
>Maybe not random, but some sorta hash will be useful here? And it
>should not break the invariant mentioned by Maria. But for the hash we
>still need some means to convert IP addresses to integer numbers,
>because including IP into the hash seems to be reasonable.
>
>On Sun, Feb 11, 2024 at 3:12 PM Max Tulyev <maxtul at netassist.ua> wrote:
>>
>> In our case no. We use the route reflector, so it should export the random route to other routers, not just use it by itself.
>>
>> On Sun, 11 Feb 2024 08:55:02 -0500
>> "Darren O'Connor" <mellow.drifter at gmail.com> wrote:
>>
>> > Isn't this a problem for multipath/add path to fix?
>> >
>> > On Sun, Feb 11, 2024, 08:43 Max Tulyev <maxtul at netassist.ua> wrote:
>> >
>> > > Yes, that's correct. I have same routes come from different routers, and I
>> > > want to spread the traffic between them, but if one router fails - keep it
>> > > working using anothers.
>> > >
>> > > Okay, is it possible to get the variable as the result of the shell
>> > > script? Like
>> > >
>> > > localpref = `cat prefpeer`
>> > >
>> > > On Sun, 11 Feb 2024 18:04:18 +0800
>> > > Brandon Zhi <Brandon at huize.asia> wrote:
>> > >
>> > > > I think the only usage for random number is for loading balance.
>> > > >
>> > > > *Brandon Zhi*
>> > > > HUIZE LTD
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>> > > >
>> > > > Maria Matejka via Bird-users <bird-users at network.cz>于2024年2月11日
>> > > 周日06:03写道：
>> > > >
>> > > > > Hello!
>> > > > >
>> > > > > No, it's not possible and it makes the filters non-deterministic which
>> > > > > would break a critical invariant in BIRD's internal algorithms.
>> > > > >
>> > > > > If you better clarify what you are trying to achieve, we may find
>> > > another
>> > > > > way for you to do it, or at least convert it to a viable feature
>> > > request.
>> > > > >
>> > > > > Thank you for your understanding
>> > > > > Maria
>> > > > > On 2024-02-10 20:56, Max Tulyev wrote:
>> > > > >
>> > > > > Hi All,
>> > > > >
>> > > > > is it possible to add a random number to some variable in the filter?
>> > > > >
>> > > > > For example, like this:
>> > > > >
>> > > > > filter myfilter
>> > > > > {
>> > > > >     if net ~ 192.168.11.0/24 then preference = preference +
>> > > random(10);
>> > > > >
>> > > > > ...
>> > > > >
>> > > > > --
>> > > > > Maria Matejka (she/her) | BIRD Team Leader | CZ.NIC, z.s.p.o.
>> > > > >
>> > > > >
>> > >
>> > >
>>
>

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