My client has network setup as in diagram. R0 is the router connected to the LAN and R1 and R2 are connected to different service providers. Currently R1 and R2 are the routers running bgp with providers.
Traffic shifting is done from the R0 with default route pointing towards either R1 or R2 when one of the providers link goes down.
My question is that is there a way I can make sure traffic is automatically shifted from R0 without manually changing the default route. I dont want to run BGP on the R0 router connected to LAN.
Assuming R1 and R2 have complete external routes, you could place a default route on R1 pointing to R2 and the converse. Loss of one router's external routes would redirect all its traffic to your other externally connected router.
Assuming R1 and R2 again have complete external routes, and have the resources for another instance, another possible method, run iBGP between R1 and R2. Each will know about the alternate path. (They will also be able to redirect traffic if the other provider has a better path.)
A common segment between R1 and R2 isn't required, but if redirected traffic from R1 to R2 transits R0, R0 will have to be configured such that it doesn't subject that traffic to using the default route.
Other possible methods, if R1 and R2 don't have complete external routers, floating routes tracking on both R1 and R2, again with redirection to the other. Both R1 and R2 sourcing a default route advertized to R0 via an IGP (not BGP), but withdrawn if they lose the outbound path.
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