Route preference for one address

[kc atgb]

Le Mon, 16 Dec 2019 20:54:16 +0000,
kc atgb <kisscoolandthegangbang at hotmail.fr> a écrit :

> Hello,
> 
> I started using bird some days ago from zero knowledge. With the different
> docs I found all around I understand a little bit more how that works. 
> 
> My configuration is made of 2 sites connected by 2 seperated links. Each link
> have a dedicated vpn connection for internal routing. One nominal link and one
> backup. 
> In case of failure, the switch from one link to the other is working. 
> 
> What I want to do now, is to force the routing for one specific address (/32)
> via the backup link whereas the rest of the /24 is using the first one. And
> in case of failure of the backup link, the /32 should use the first one. 
> 
> I tried different things and from what I have found, my configuration is
> working partially. I mean there is no fallback to the first link if the second
> is in failed state. 
> I tried with static routing and export filter. 
> 
> With static:
> protocol static s_special {
>       import all;
> 
>       route 192.168.1.78/32 via 10.194.11.2 {
>               preference = 250;
>       };
> }
> 
> The route stays active when the link is down so the traffic can not go back to
> source. 
> 
> With filter:
> filter export2kernel {
> 
>         if net = 192.168.1.78/32 then ifname = "tun1";
> 
>         accept;
> }
> 
> The same thing happens. 
> 
> I took a look also to preference/cost/... but I am unable to achieve what I am
> looking to do. 
> 
> So my question, what should I look for to have this working like explained ? 
> What information should I provide if it is not clear ? 
> 
> Thanks in advance,
> Kay
> 

Hi,

After rereading there some informations that are missing I think, sorry. 
I'm running bird 1.6.8 on FreeBSD 11.2R x86_64. 

I'm trying to achieve above setup with ospf protocol. 

And here is what the network look like. 

                      ____               ____
              |      |    |   VPNLINK1  |    |      |
10.194.0.0/16 |      |    |-------------|    |      | 192.168.1.0/24
              |      |    |             |    |      |
              | ---- | R1 |             | R2 | ---- |
              |      |    |             |    |      |
              |      |    |-------------|    |      |
              |      |____|   VPNLINK2  |____|      |


Kay,