cost to reach the root switch

Im studying STP ICND2 ch2 and i am about to catch some z's. I was trying to understand how the Cost is calculated. I know that in routing protocols things such as hop count or metrics? ...go into affect to calculate the best path. I guess I am trying to compare hop counts and cost on a layer 2 protocol or how it comes about. I only read half so im guessing the answer to my question is in the other half of the chapter regarding STP timers....
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Comments

ncsugrad2002

what are you asking? lol

i think you need sleep

Satcom

phoeneous wrote: »

Cost is based on the receiving ports speed. Take the example below. If switch C is the root and if all ports on all switches are 100Mb then the cost from B to C is 19. The cost from A to C is also 19. Always remember, cost is calculated on the receiving port, not the sending port!

These are the common port costs:

10Mb = 100
100Mb = 19
1000Mb = 4
10000Mb = 2

Thanks this is what I was looking for