H3C Technologies H3C WX5500E Series Access Controllers - Manual (Page 185)

174
Type Description
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 assist 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.
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 TLV
encapsulates the management address.
Working mechanism
This section describes the working mechanism of LLDP.
LLDP operating modes
LLDP can operate in one of the following modes:
• TxRx mode—A port in this mode sends and receives LLDPDUs.
• Tx mode—A port in this mode only sends LLDPDUs.
• Rx mode—A port in this mode only receives LLDPDUs.
• Disable mode—A port in this mode does not send or receive LLDPDUs.
Each time the LLDP operating mode of a port changes, its LLDP protocol state machine re-initializes. A
re-initialization delay, which is user configurable, prevents LLDP from being initialized too frequently
when the operating mode frequently changes. With this delay configured, a port must wait the specified
interval after the LLDP operating mode changes before it initializes LLDP.
Transmitting LLDPDUs
An LLDP-enabled port operating in TxRx mode or Tx mode sends LLDPDUs to its directly connected
devices both periodically and when the local configuration changes. To prevent LLDPDUs from
overwhelming the network when local device information frequently changes, a port must wait a
specified interval between two successive LLDPDUs.
This interval is shortened to 1 second in either of the following cases:
• A new neighbor is discovered. A new LLDPDU is received and carries new device information to the
local device.
• The LLDP operating mode of the port changes from Disable or Rx to TxRx or Tx.