Prevent duplicate routes with OSPF

[Kees Meijs]

Hi list,

This is probably a question that was answered many times before: how can
I prevent duplicate routes originating from OSPF?

For example, a routing table with BIRD2 shut down:

> # ip r s
> default via 192.168.255.1 dev eth0
> 192.168.255.0/24 dev eth0 proto kernel scope link src 192.168.255.82 

And... with BIRD2 running:

> # ip r s
> default via 192.168.255.1 dev eth0
> 1.2.3.4 dev dummy0 proto bird scope link metric 32
> 1.2.3.7 via 192.168.255.213 dev eth0 proto bird metric 32
> 192.168.255.0/24 dev eth0 proto kernel scope link src 192.168.255.82
> 192.168.255.0/24 dev eth0 proto bird scope link metric 32

In this example at least 192.168.255.0/24 is a duplicate.

Configuration used:

> log syslog all;
> protocol device {
> }
>
> protocol direct {
>     disabled;        # Disable by default
>     ipv4;            # Connect to default IPv4 table
>     ipv6;            # ... and to default IPv6 table
> }
>
> protocol kernel {
>     ipv4 {            # Connect protocol to IPv4 table by channel
>         export all;    # Export to protocol. default is export none
>     };
> }
>
> protocol kernel {
>     ipv6 {            # Connect protocol to IPv4 table by channel
>         export all;    # Export to protocol. default is export none
>     };
> }
>
> protocol static {
>     ipv4;            # Again, IPv4 channel with default options
> }
>
> protocol static {
>     ipv6;
> }
>
> protocol ospf v2 foobar {
>     area 0.0.0.0 {
>         interface "dummy0" {
>             stub;
>         };
>         interface "eth0" {
>         };
>     };
> }

How can I prevent direct connected routes from showing up from OSPF as
well ending up in duplicates?

Thanks in advance!

Regards,
Kees

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