how does bird choose primary ip address for ospf?

[Ondrej Filip]

On 30.6.2009 12:43, Martin Kraus wrote:
> Hi. I've just ran into a little problem with bird 1.1.0, but it just might be
> a problem with linux. I'm setting ip addresses on interfaces using ifupdown
> and /etc/network/interfaces where public ip address gets set up using builtin
> configuration parameters(address/netmask) and private ip address(for switches
> etc.) gets set up using the "up /sbin/ip address add ...." command.
>
> I've never had any problems using this setup, since it first sets the public
> ip address, which ospf uses, and then sets the private prefix, which just gets
> propagated. Today, using the same configuration, bird chose the private ip
> address as a primary address for ospf. The ip private ip address was set up as
> a second address but using show interfaces in bird client showed the private
> ip address as primary:

Yes, we changed this mechanism. It is described here: 
http://bird.network.cz/?get_doc&f=bird-6.html#ss6.2

So you have to change your "device" section for example like this:

protocol device {
         scan time 10;           # Scan the interfaces often
         primary 212.71.128.0/18;
}

		Ondrej



>
> eth1 up (index=3)
>      MultiAccess Broadcast Multicast AdminUp LinkUp MTU=1500
>      172.23.17.129/25 (Primary, broadcast 172.23.17.255, scope site)
>      212.71.177.129/28 (Unselected, broadcast 212.71.177.143, scope univ)
>
>
> Could this be an issue with bird, or is it some problem with kernel/ifupdown?
>
> thanks
> mk