Last Updated on July 31, 2021 by Admin 1
OSPF area border routers (ABRs) advertise a default route to stub and totally stubby areas.Which command is the BEST command to configure a cost of 25 for the default route advertised to area 1?
Router(config-router)# area 1 cost 25
Router(config-router)# area 1 default 25
Router(config-router)# area 1 default-cost 25
Router(config-router)# area 1 default-route-cost 25
The correct answer is area 1 default-cost 25. Even though another option (area 1 default 25) is a configurable abbreviation for the command, the more correct answer explicitly specifies the default-cost parameter. The correct syntax for the area default-cost command is shown below:
Router(config-router)# area area-id default-cost cost
If you have multiple border routers between two areas, you might prefer one exit-point router over the other for that area. By configuring one with a lower cost than the other, it will become the preferred exit point. If that router or its links were to fail, then the routers interior to the area would route through the second-best exit point. You could also set the default costs to values that are close to achieve better load balancing. The default default-cost is 1. Please see the network shown in the graphic.
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