230
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 discover the local device as soon as possible.
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 time
to live (TTL) value in the Time to Live TLV carried in the LLDPDU. If the TTL value is zero, the 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
When you configure LLDP, follow these guidelines:
•
LLDP-related configurations made in Layer 2/Layer 3 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.
•
The term "Layer 3 interface" refers to route-mode (or Layer 3) Ethernet ports. You can set an Ethernet
port to operate in route mode by using the
port
link-mode
route
command (see "
").
Complete these tasks to configure LLDP:
Task
Remarks
Performing basic
LLDP configuration
Required
Setting the LLDP operating mode
Optional
Setting the LLDP re-initialization delay
Optional
Optional
Configuring the advertisable TLVs
Optional
Configuring the management address and its encoding format
Optional
Optional
Setting an encapsulation format for LLDPDUs
Optional
Optional
Optional
Performing basic LLDP configuration
Enabling LLDP
To make LLDP take effect on specific ports, you must enable LLDP both globally and on these ports.
To enable LLDP:
