For happening on your CCNA 640-802 and CCENT exams, you stipulation to get the drift how and why Frame Relay LMI messages direct. You involve to cognise this for real-world networking as well, since Frame Relay is rife in today's networks - and without LMI, you have no Frame Relay!
The Local Management Interface (LMI) messages are transmitted linking the DCE, typically the service provider, and the DTE, the Cisco skilled worker. LMI Status messages spoon over as keepalives for the frame association. If keepalives are not frequently prescriptive by both the DCE and DTE, the bones bond will bubble. The LMI likewise indicates the PVC position to the router, echoic as either moving or desk.