LLDP-MED (Media Endpoint Discovery) is published by the Telecommunications Industry Association (TIA). It is an extension to LLDP that operates between endpoint devices and network connectivity devices. LLDP-MED specifically provides support for voice over IP (VoIP) applications and provides the following capabilities:
- Capabilities Discovery—allows LLDP-MED endpoints to determine the capabilities that the connected device supports and has enabled. It can be used to indicate whether the connected device is a phone, a switch, a repeater, etc.
- Voice VLAN Configuration—provides a mechanism for a switch to notify a device which VLAN to use, which enables ―plug and play‖ networking.
- Power Management—provides information related to how the device is powered, power priority, and how much power the device needs.
- Inventory Management—provides a means to manage device and the attributes of the device such as model number, serial number, software revision, etc.
- Location Identification Discovery—provides location information from the switch to the device when making an emergency call.
In addition to the TLVs advertised by LLDP, LLDP-MED also supports advertising the following TLVs:
- LLDP-MED capabilities TLV
- Network policy TLV
- Power management TLV
- Inventory management TLV
- Location identification TLV (not supported by IP phones)
- Feature is available in the software 2.24.12 or higher.
- LLDP-MED is by default enabled on the Maxwell.
- LLDP-MED configuration is done on the Switch and not in the Maxwell.
- No reboot is needed if VLAN is changed by LLDP.
- If no LLDP packages are received anymore, the device will switch back to the normal mode.