H3C Technologies H3C S7500E Series Switches - Manual (Page 316)

22-6
Type Description
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
Management address
The management address of a device is used by the network management system to identify and
manage the device for topology maintenance and network management. The management address is
encapsulated in the management address TLV.
How LLDP Works
Operating Modes of LLDP
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.
When the LLDP operating mode of a port changes, its LLDP protocol state machine re-initializes. To
prevent LLDP from being initialized too frequently during times of frequent operating mode change,
you can configure a re-initialization delay. With this delay configured, a port must wait for the specified
interval before it can initialize LLDP after the LLDP operating mode changes.
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 the network from being
overwhelmed by LLDPDUs during times of frequent local device information change, an interval is
introduced between two successive LLDPDUs.
This interval is shortened to 1 second in either of the following two cases:
A new neighbor is discovered, in other words, a new LLDPDU is received carrying device
information new to the local device.