OSPF cost in a point-to-multipoint setup
From OISecWiki
When 3 routers are connected to each other on a single broadcast medium the definition of cost can be cumbersome. Normally in point-to-point connections we just put the cost on the specific interface.
In a point-to-multipoint setup you must define the cost specific for the neighbor.
For example in the following situation. We have 3 routers in Vlan10 and the range is 10.100.21.0/24. We want different cost towards 10.100.21.1 and 10.100.21.2.
On Cisco IOS this can be done as following:
router ospf 1 router-id 10.100.20.1 neighbor 10.100.21.1 cost 20 neighbor 10.100.21.2 cost 10
