Bluetooth Devices Question:

Multiple data links are combined for the formation of a single traffic engineering link, for the purpose of scale ability. The in-band messaging is not restricted by the management of TE links, but can be utilized by using out-of-band techniques.
The Link Management Protocol runs between a pair of nodes and is utilized for managing TE links. LMP is specifically used for maintaining control channel connectivity, verifying the physical connectivity of the data links, correlating the link property information, suppressing downstream alarms and localizing the link failures for protection/restoration purposes.