For an RSTP shared port configuration, which command is utilized?

The command used for configuring an RSTP shared port is "spanning-tree link-type shared." This command specifically sets the link type of the port to shared, which is important in the context of Rapid Spanning Tree Protocol (RSTP). A shared port is one that can be utilized by multiple MAC addresses and is typically used in environments like shared LAN segments where devices communicate over the same medium.

Setting a port as shared is essential for RSTP to make the necessary decisions about how to manage network loops and ensure efficient data traffic flow. This command informs the spanning tree algorithm about the port's capability and behavior regarding handling traffic.

The other choices do not accurately represent the command necessary for configuring shared port characteristics in RSTP. For instance, "spanning-tree portfast" is relevant for configuring Fast Ethernet ports to immediately transition to the forwarding state, but it does not define the type of link. Similarly, "spanning-tree shared" and "spanning-tree type shared" are not recognized commands in the context of RSTP configuration. These commands do not exist in Cisco's IOS command structure for RSTP. Understanding these distinctions helps sharpen the focus on set commands crucial for configuring Rapid Spanning Tree Protocol effectively.