What is the RSTP port cost for a 1 Tbps link?

In Rapid Spanning Tree Protocol (RSTP), port cost is a crucial metric that helps determine the best path for data traffic in the network. The cost values are defined based on the speed of the links. For a 1 Tbps (terabits per second) link, the standard cost assigned is 20. This value is part of the cost calculation, where higher-speed links have lower costs, making them preferred paths in the Spanning Tree Protocol's algorithm.

This value reflects the timescale set by IEEE 802.1D, which categorizes link costs in relation to the link bandwidth. Consequently, a link speed of 1 Tbps is categorized as a very high-speed link, resulting in a relatively lower port cost. Understanding these cost metrics is vital when designing and analyzing network topologies to ensure optimal data flow and avoiding loops.