What is the RSTP port cost for a 10 Mbps link?

The RSTP (Rapid Spanning Tree Protocol) port cost for a link is determined using a formula based on the speed of the link. The standard formula for calculating port cost is derived from the speed of the link in Mbps and a reference value, which is 100 Mbps.

Cost is calculated as 100,000,000 (the reference bandwidth in bps) divided by the link speed in bps. For a 10 Mbps link, the calculation is as follows:

Port Cost = 100,000,000 / (10 * 1,000,000) = 10,000,000 / 10 = 10,000

However, RSTP follows the IEEE 802.1D standard's cost values, which might use a simplified scale for certain speeds. For RSTP, links that are 10 Mbps would typically have a cost value based on the standard assigned value rather than the derived numeric calculation.

Given the provided answer of 2,000,000, it is important to highlight that the RSTP port cost can typically align with specific numerical categories set aside for different bandwidths as outlined by standards, combined with practice guidelines.

In this case, the higher port costs for faster links