What command is used to monitor LMI statistics in Frame Relay?

The command used to monitor LMI (Local Management Interface) statistics in Frame Relay is "show frame-relay lmi." This command is crucial because it provides information about the LMI status, including message statistics and status of the interface connections. LMI is a signaling standard used in Frame Relay networks to manage virtual circuits and allows the networking devices to exchange information about the status of the network.

By issuing this command, network administrators can troubleshoot connectivity issues, monitor the state of the network, and ensure that the Frame Relay service is operating as intended. The output can show important parameters such as the LMI type, the number of LMI updates received, and any errors that might be affecting the communication.

The other commands listed do not provide the specific details pertinent to LMI statistics. For instance, while "show frame-relay pvc" displays information about the permanent virtual circuits, it does not focus on the management interface metrics. Similarly, "monitor frame-relay lmi" and "status frame-relay lmi" are not valid commands within the context of Cisco IOS and would not yield relevant information concerning LMI statistics. Thus, the command "show frame-relay lmi" is the appropriate choice for accessing LMI-related information.