Question

An SP operates a multi-area OSPFv2 network. Area 10 contains three internal networks summarized at the ABR using 'area 10 range 10.20.0.0 255.255.0.0'. The most-specific component route inside Area 10 has a cost of 30, while the highest-cost component route is 80. The network team wants the Type 3 summary LSA advertised into Area 0 to carry a deterministic cost of 100 regardless of internal component changes. Which action on the ABR achieves this?

Accepted Answer

Add the 'cost 100' keyword to the area range command: 'area 10 range 10.20.0.0 255.255.0.0 cost 100'

Answer

Configure 'auto-cost reference-bandwidth' so the summary metric is recalculated to 100

Answer

Apply an outbound route-map with 'set metric 100' to OSPF on the Area 0 interfaces

Answer

Set the interface cost of the Area 0 link facing the backbone to 100