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

In Rapid Spanning Tree Protocol (RSTP), the port cost is determined based primarily on the bandwidth of the link. RSTP, which is an evolution of the original Spanning Tree Protocol (STP), uses port cost as a metric to help determine the best path through a network to prevent loops.

For a 10 Tbps link, the port cost is calculated using a specific formula established by the IEEE, which is designed to yield lower port costs for higher bandwidths. In this case, the cost associated with a 10 Tbps link has been defined as 2.

This relatively low cost reflects the fact that 10 Tbps is a high bandwidth capability, allowing for data to traverse quickly through that link with a minimal penalty in terms of path cost. The lower the cost value, the more preferred the path is for forwarding traffic towards the root bridge in a spanning tree topology.

Understanding how port costs are assigned in RSTP is crucial for network design and optimization, as it determines the effective use of available paths and assists in preventing network loops.