Extended
Power-via-MDI
Allows a network device or terminal device to advertise power supply
capability. This TLV is an extension of the Power Via MDI TLV.
Hardware Revision Allows a terminal device to advertise its hardware version.
Firmware Revision Allows a terminal device to advertise its firmware version.
Software Revision Allows a terminal device to advertise its software version.
Serial Number Allows a terminal device to advertise its serial number.
Manufacturer Name Allows a terminal device to advertise its vendor name.
Model Name Allows a terminal device to advertise its model name.
Asset ID
Allows a terminal device to advertise its asset ID. The typical case is that the
user specifies the asset ID for the endpoint to facilitate directory management
and asset tracking.
Location Identification
Allows a network device to advertise the appropriate location identifier
information for a terminal device to use in the context of location-based
applications.
For more information about LLDPDU TLVs, see the IEEE standard (LLDP) 802.1AB-2005 and the
LLDP-MED standard (ANSI/TIA-1057).
Management address
The network management system uses the management address of a device to identify and manage the
device for topology maintenance and network management. The management address is encapsulated
in the management address TLV.
LLDP operating modes
LLDP can operate in one of the following modes:
• TxRx mode—A port in this mode can send and receive LLDP frames.
• Tx mode—A port in this mode can only send LLDP frames.
• Rx mode—A port in this mode can only receive LLDP frames.
• Disable mode—A port in this mode cannot send or receive LLDP frames.
Each time the LLDP operating mode of a port changes, its LLDP protocol state machine reinitializes. A
configurable reinitialization delay prevents frequent initializations caused by frequent changes to the
operating mode. If you configure the reinitialization delay, a port must wait the specified amount of time
to initialize LLDP after the LLDP operating mode changes.
Working mechanism
Transmitting LLDP frames
An LLDP-enabled port operating in TxRx mode or Tx mode sends LLDP frames to its directly connected
devices both periodically and when the local configuration changes. To prevent LLDP frames from
overwhelming the network during times of frequent changes to local device information, an interval is
introduced between two successive LLDP frames.
This interval is shortened to 1 second in either of the following cases:
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