OSPF generate default route

[Slawa Olhovchenkov]

On Mon, Aug 26, 2013 at 09:49:14AM +0200, Ondrej Filip wrote:

> On 26.8.2013 09:41, Slawa Olhovchenkov wrote:
> > On Mon, Aug 26, 2013 at 10:09:17AM +0200, Ondrej Zajicek wrote:
> > 
> >> On Mon, Aug 26, 2013 at 01:36:13AM +0400, Slawa Olhovchenkov wrote:
> >>> I have configuration problem: how I can generate default route in OSPF
> >>> area?
> >>>
> >>> Generate, not redistribute from static kernel route or other routing
> >>> protocol.
> >>
> >> What is the difference?
> > 
> > default route not present in kernel nor other routing protocols, only
> > prpopagate to OSPF area (from border router with full view BGP, for example).
> > 
> 
> Santiago's point is, that you don't have to connect such a static
> protocol to anything else. So it does not have to be connected to
> kernel protocol.

OK, what about conditional propagate?
For example where 8.8.8.0/24 present in table?
(ex: two full-view BGP router with OSPF between, need to switch to
backup gateway)