I have a small OSPF design problem.
let say we have 1 edge router "E1" and two distribution routers "D1" and "D2".
they are connected to VLAN 900 and communitace with each other via this single VLAN.
OSPF is configured on those interfaces and all routers see each other in neighbor list and exchange the route information. It means that E1 has for each prefix two pathes - one via D1 and second via D2 and because the cost is the same for both (cost is defined on physical interface on E1 ) E1 tries to loadbalance the traffic between D1 and D2. It's not bad but I'd like to define that E1 uses only D1 as primary and D2 only as secondory next hop.
I can't define the neighbor cost in my current OSPF configuration, because per default OSPF now in "broadcast" mode. But if I'm afraid to change the mode to "point-to-multipoint" because I don'T know how this mode works in normal broadcast LAN.
Any suggesting to help to solve my problem?