What is the cost of an RSTP port with a speed of 1 Tbps?

To understand the cost of an RSTP (Rapid Spanning Tree Protocol) port, it's crucial to recognize how port cost is calculated based on the speed of the network links. RSTP uses a standard method to assign cost values to different speeds, which helps in determining the best path for data traffic in a network.

For Ethernet connections, the cost of a port is determined from a predefined cost table. A port with a speed of 1 Tbps (terabits per second) is classified among high-speed connections. According to the IEEE 802.1D standard that RSTP follows, the cost for a link that operates at 1 Tbps is assigned a value of 20.

This cost is important during the spanning tree algorithm's execution, as the protocol needs to evaluate multiple paths to determine which one to use, based on the lowest cost. In summary, a port with a speed of 1 Tbps carries a cost of 20, allowing the RSTP to effectively manage and make decisions on forwarding data with an understanding of link efficiency.