I know that there happens a negotiation between the IEEE PD devices and directly connected POE Switch through CDP or LLDP protocols. But if for some unknown reasons, if the CDP/LLDP is disabled on the IEEE PD. How much power does the switch allocate for that particular powered device if the negotiation fails? What is the importance of this negotiation? How does this negotiation change when the POE+ connected to the Switch port?
Really appreciate if you can help me understand these concepts well.