Rapid Spanning Tree Protocol - Cost question...

Working through some examples and came across a question here....

If Switch A and Switch B are connected such that the the FASTETHERNET port on Switch A is connected to a GIGABIT ETHERNET port on Switch B, I would have to imagine that the cost for that link would default to the lower bandwidth of the fastethernet port and the link would be advertised as a cost of 19 to RSTP for port selection right?

Thanks!

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Comments

jboogie81

Yep, the speed used for cost is the "actual" operating speed of the link and not the maximum capable speed of the port.

Freejole

Ok yea thats what I thought. Thanks!

ccnpninja

Pay attention that we refer to the cost of an interface (port cost) and the cost of a switching path (root path cost). Saying "cost of a link" is misleading I think.

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