26
Type Description
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.
NOTE:
•
If the MAC/PHY configuration/status TLV is not advertisable, none of the LLDP-MED TLVs
will be advertised even if they are advertisable.
•
If the LLDP-MED capabilities TLV is not advertisable, the other LLDP-MED TLVs will not be
advertised even if they are advertisable.
Management address
The network management system uses the management address of a device to identify and manage
the device for topology main tenance and network manag ement. The manageme nt address is
encapsulated in the management address TLV.
Working mechanism
LLDP operating modes
An LLDP agent can operate in one of the following modes:
•
TxRx
mode
—An LLDP agent in this mode can send and receive LLDP frames.
•
Tx
mode
—An LLDP agent in this mode can only send LLDP frames.
•
Rx
mode
—An LLDP agent in this mode can only receive LLDP frames.
•
Disable
mode
—An LLDP agent in this mode cannot send or receive LLDP frames.
Each time the LLDP operating mode of an LLDP agent 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, an LLDP agent must wait
the specified amount of time to initialize LLDP after the LLDP operating mode changes.
Transmitting LLDP frames
An LLDP agent 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, LLDP uses
