we have switch which has gigabit ports and 4 ports are bundled and all 4 are up in port channel
i know cost of 2gigbit is 3
but here we have 4 ports and cost of stp is 3?
can some one explain why this so
Because there are only so many values to use ie. 10Gbps = 2, 20Gbps = 1. So you are kind of limted with what values you can use, hence the reason 4Gbps and 2Gbps are both 3. Don't forget you can alter the cost if you want to influence which path traffic takes within your network.
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