H3C Technologies H3C WX5500E Series Access Controllers - Manual (Page 186)

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This is the fast sending mechanism of LLDP. With this mechanism, a specific number of LLDPDUs are sent
successively at 1-second intervals, to help LLDP neighbors quickly discover the local device. Then, the
normal LLDPDU transmit interval resumes.
Receiving LLDPDUs
An LLDP-enabled port that is operating in TxRx mode or Rx mode checks the validity of TLVs carried in
every received LLDPDU. If valid, the information is saved and an aging timer is set for it based on the TTL
value in the Time to Live TLV carried in the LLDPDU. If the TTL value is zero, information ages out
immediately.
Protocols and standards
• IEEE 802.1AB-2005, Station and Media Access Control Connectivity Discovery
• ANSI/TIA-1057, Link Layer Discovery Protocol for Media Endpoint Devices
LLDP configuration task list
Task Remarks
Performing basic LLDP
configuration
Enabling LLDP Required.
Setting the LLDP operating mode Optional.
Setting the LLDP re-initialization delay Optional.
Enabling LLDP polling Optional.
Configuring the advertisable TLVs Optional.
Configuring the management address and its
encoding format
Optional.
Setting other LLDP parameters Optional.
Setting an encapsulation format for LLDPDUs Optional.
Configuring CDP compatibility Optional.
Enabling LLDP to automatically discover IP phones Optional
Configuring LLDP trapping Optional.
NOTE:
LLDP-related configurations made in Ethernet interface view take effect only on the current port, and those
made in port group view take effect on all ports in the current port group.
Performing basic LLDP configuration
This section describes how to perform basic LLDP configuration.
Enabling LLDP
To make LLDP take effect on specific ports, you must enable LLDP both globally and on these ports.