Frr default route / gateway group

[thesurf]

Hi, I have a remote office. It has a lwl uplink to the main office and a wlan backup.

I have setup frr (ospf) to propagate all networks from main office to the remote location.

The main office has many site-2-site con. Since they are policy based I have no route which could be advertised. So I know thinking set the default route via routinggroup or can this be done by frr.

At the moment failover to the other line works perfect with ospf.

Any hint would be appreciated.