Type

Description

Extended

Allows a network device or terminal device to advertise power supply

Power-via-MDI

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.

 

 

 

Allows a terminal device to advertise its asset ID. The typical case is that the

Asset ID

user specifies the asset ID for the endpoint to facilitate directory management

 

and asset tracking.

 

 

 

Allows a network device to advertise the appropriate location identifier

Location Identification

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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