LLDP (Linker Layer Discovery Protocol) is a vendor-neutral Link Layer protocol, which
allows IP phones to receive and/or transmit device-related information from/to directly
connected devices on the network that are also using the protocol, and store the
information about other devices. LLDP transmits information as packets called LLDP
Data Units (LLDPDUs). An LLDPDU consists of a set of Type-Length-Value (TLV) elements,
each of which contains a particular type of information about the device or port
transmitting it.
LLDP-MED (Media Endpoint Discovery)
LLDP-MED 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 provides the following capabilities for IP phones:
Capabilities Discovery -- allows LLDP-MED IP phones to determine the capabilities
that the connected switch supports and has enabled.
Network Policy -- provides voice VLAN configuration to notify IP phones which VLAN
to use and QoS-related configuration for voice data. It provides a “plug and play”
network environment.
Power Management -- provides information related to how IP phones are powered,
power priority, and how much power IP phones need.
Inventory Management -- provides a means to effectively manage IP phones and
their attributes such as model number, serial number and software revision.
TLVs supported by IP phones are summarized in the following table:
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