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17.1 Introduction to LLDP-MED
LLDP-MED (Link Layer Discovery Protocol-Media Endpoint Discovery) based on 802.1AB
LLDP (Link Layer Discovery Protocol) of IEEE. LLDP provides a standard link layer discovery
mode, it sends local device information (including its major capability, management IP address,
device ID and port ID) as TLV (type/length/value) triplets in LLDPDU (Link Layer Discovery
Protocol Data Unit) to the direct connection neighbors. The device information received by the
neighbors will be stored with a standard management information base (MIB). This allows a
network management system to quickly detect and identify the communication status of the
link.
In 802.1AB LLDP, there is no transmission and management about the voice device
information. To deploy and manage voice device expediently, LLDP-MED TLVs provide
multiple information, such as PoE (Power over Ethernet), network policy, and the location
information of the emergent telephone service.
17.2 LLDP-MED Configuration Task Sequence
1. Basic LLDP-MED configuration
Command
Port mode
lldp transmit med tlv all
no lldp transmit med tlv all
lldp transmit med tlv capability
no lldp transmit med tlv capability
lldp transmit med tlv networkPolicy
Chapter 17 LLDP-MED
17-61
Explanation
Configure the specified port to
send all LLDP-MED TLVs. The
no command disables the
function.
Configure the specified port to
send LLDP-MED Capability
TLV. The no command
disables the capability.
Configure the specified port to
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Troubleshooting
