OSPF - CISCO COST MODIFICATION

In this session we will see how to modify and check the cost on Cisco IOS devices for the OSPF routing protocol (interface level and global configuration)

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Video Description

bandwidth
ip ospf cost
auto-cost reference-bandwidth [REFERENCE-MB]

By default, the reference bandwidth is 100 Mb. Meaning that a link with a speed of 100 Mb will have a cost of 1.
Reference = cost * bandwidth
For example, if we want that a FastEthernet interface has a cost of 70:
Reference = 70 * 100.000.000
Reference = 7.000.000.000

The configuration of the auto-cost command should be:
auto-cost reference-bandwidth 7000
We need to be careful and ensure no link will end up with a max metric (65535)
It's recommended that all of the routers use the same reference value

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