What command is used to verify MST instances?

To verify Multiple Spanning Tree (MST) instances, the command used is "show mst configuration." This command specifically displays the MST configuration details such as the number of MST instances, their corresponding VLANs, and the configuration revision numbers. By utilizing this command, network engineers can confirm the proper configuration of MST and ensure that VLANs are correctly mapped to the respective MST instances. This information is crucial for troubleshooting and optimizing network performance in environments where spanning tree protocols are deployed.

The other options serve different purposes: "show spanning-tree" provides information regarding the spanning tree status for all VLANs, "show vlan" displays VLAN information and their ports, and "show interface status" reveals the operational status of interfaces. While these commands can provide useful data, they do not specifically focus on the details of MST instances and configurations.