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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
LLDP-related configurations made in Layer 2 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.
Complete these tasks to configure LLDP:
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
Configuring LLDP trapping 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:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
2. Enable LLDP globally.
lldp enable
By default, LLDP is globally
enabled.
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