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The designated cost is the cost of the directly connected router to the root bridge. Example is explained as follows:

designated-cost-example

For example when we change the cost of F1/1 of SWC to 5 for VLAN 2 and cost of F1/2 of SWB for VLAN 2 to 11, SWD shows 16 (11+5) as a designated cost for VLAN 2 as shown below:

designated-cost

designated-cost2

See some explanation below:

designated-cost-explanation

designated-cost-scenerio-explained

designated-cost-zero

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