Prerequisites: CCNP level skills.
Note!
Use OSPF point-to-multipoint on the Frame-Relay connections (configuration and topology from Lab20).
Use OSPF point-to-multipoint on the Frame-Relay connections (configuration and topology from Lab20).
Topology
Pic. 1 – OSPF Topology.
Task 1
In order to support 1 Gbps interfaces, change the way OSPF calculates the cost. The cost of FastEthernet interface should be 500.
Lab Solution
Task 1
In order to support 1 Gbps interfaces, change the way OSPF calculates the cost. The cost of FastEthernet interface should be 500.
Note!
The default OSPF reference bandwidth used to calculate the cost of the interface is 100Mbps (number=100). The formula is:
cost = Reference-Bandwidth / Bandwidth_of_the_link
Note!
After changing the reference-bandwidth on one router, this same way should be used on all of them in order to have a consistent way of calculating the cost.
R1, R2, R3 Configuration:
!
router ospf 1
auto-cost reference-bandwidth 50000
auto-cost reference-bandwidth 50000
!
Verification:
Pic. 2 – R2’s Cost of F1/0.
