On Wed, May 01, 2013 at 10:00:55PM +0200, Loïc BLOT wrote: > In fact, this isn't really an interarea problem but a inter protocol > problem. > > Next month i'll have two border routers which are connecter to MAN by > BGP. In my LAN and on my tunnels i'm in a "LAN backbone" area. > > Because of the priority of OSPF and the default route redistribution, > the default route will be redistributed on my GRE tunnel and also > between the two border routers and those routes are prior to BGP routes. > A problem is also redistribute default is a global function, then the > default route will be redistributed (and also taken) everywhere) . > If we could configure redistribute default/static/connected on area, i > could split my "LAN backbone" area into 3 areas (1 per site + 1 for > GRE), and do not redistribute default route on GRE, but the > redistribution between the two border routers is not fixed. Then the > only way to resolve this issue is to filter entries to kernel routing > table, you are right. >
Hmm. I don't know your network setup but you should redistribute the default route from your border routers. Also the routing priority only matters for equal prefixes so the more specifc bgp routes from a full feed will still be considered. Last but not least on border routers I also normaly install a default blackhole route which again would prevent the ospf default route to take precedence (if the prio is set right of course). -- :wq Claudio
