Imagine that my goal is to let traffic flow through site1-br-gw. In case site1 link or components are unavailable, then traffic should flow via site2-br-gw (via gw5 and gw6). Please find attached diagram and existing OSPF config on 4507's.
So I built conifguration using full-mesh BGP peering among the (4) 4507's involved. I did peer the respective site1 and site2 4507's with the respective border router for the respective site.
In order to make site1 as the preferred path (via gw5 and gw6) do I need to change the cost of the OSPF advertisements in this case? Or should I just do higher local-preference in BGP (on site1 gw5 and gw6)?