Hello! On Thu, Jan 17, 2008 at 02:07:01PM +0000, Stuart Henderson wrote: > > I want to setup fallback to a static default route if bgp fails. > > I receive default route via bgp but I want to use static automatically > > if bgp session is down of default prefix isn't received. > > Is it possible? How can I do that? > > I think the only way you can do something similar to what you're > asking for is by filtering the BGP default, and adding your own > static default (typical BSD routing tables don't support multiple > routes to the same destination, we do support it for equal-cost > multipath but not for different priority routes which I think is > what you want).
It isn't my way because actually I have two 'default route' sources: eBGP and iBGP. If eBGP 'default route' fails I'll use iBGP information. I can't override them with one static route because I'll lose redundancy if main uplink fails. I want to prevent the situation when both sessions are down and router is completely inaccessible although there is alive peering /30 link. So the priority of the routes should be: eBGP -> iBGP -> static. I decided to went another way and configure 'reply-to' feature of pf: pass in quick on em0 reply-to $default_gateway from any to $router_addres keep state If I understand reply-to option correctly $router_address should respond even if there is no default route in the routing table ($default_gateway is directly connected sure). But it doesn't work for me. When router loses it's default route - $router_address doesn't respond when I use this pf rule. What is my mistake here? -- WBR, Alexander Burnos
