How to prefer BGP route over OSPF?

[Angel Lopez Delgado]

Hi Michael,

change the preference in the OSPF config:

protocol ospf ospf_vdsl {
        area 65 {
                stub no;
                interface "vdsl0" {
                        cost 1000;

                        type broadcast;
                        authentication none;
                };
        };
      *  import filter {*
*                if net ~ [ 0.0.0.0/0 <http://0.0.0.0/0> ] then {preference
= 50; accept;}*
*                reject;*
*        };*

        export none;
};

bird> show route 0.0.0.0/0
0.0.0.0/0          unreachable [Customer 23:24:18 from 10.10.10.101] *
(100/-) [i]
                   via 10.10.10.101 on eth1 [ospf1 23:28:40] E2 (50/10/1)
[64] [201.174.1.1]
bird>



Regards.


On Sun, Feb 14, 2016 at 7:24 PM, Michael Ludvig <mludvig at logix.net.nz>
wrote:

> Hi
>
> I've got a linux router with 2 uplinks - one is a Cisco VDSL modem
> advertising 0.0.0.0/0 over OSPF when VDSL is up and one is Fibre link
> where the ISP sends us 0.0.0.0/0 over BGP.
>
> If both links are up I want to route everything over Fibre (BGP), if Fibre
> fails for any reason use the VDSL (OSPF). Here is my config:
>
> protocol ospf ospf_vdsl {
>         area 65 {
>                 stub no;
>                 interface "vdsl0" {
>                         cost 1000;
>                         type broadcast;
>                         authentication none;
>                 };
>         };
>         import where net = 0.0.0.0/0;
>         export none;
> };
>
> protocol bgp bgp_fibre {
>         local as xx526;
>         neighbor x.x.20.201 as xx746;
>         source address x.x.20.202;
>         import where net = 0.0.0.0/0;
>         export none;
> };
>
> With this config Bird 1.4.5 always prefers OSPF whenever the link is up -
> how can I tell it to prefer BGP instead? I even set the cost of the VDSL
> link to 1000 but that didn't make any difference.
>
> ~ # birdc show route for 0.0.0.0/0
> BIRD 1.4.5 ready.
> 0.0.0.0/0          via 10.65.1.1 on vdsl0 [ospf_vdsl 15:47:14] * E2
> (150/1000/1) [1] [10.65.1.1]
>                    via x.x.20.201 on fibre0 [bgp_fibre 14:28:27] (100)
> [ASxx746i]
>
>
> Thanks!
>
> Michael
>
>
>


-- 
*Angel Adrián López Delgado*

*Director Network Engineer*


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