LLDP Configuration (Link Layer Discovery Protocol)
LLDP is a standard link-layer discovery protocol which can broadcast its capability, IP address, ID, and interface name as TLVs (Type/Length/Value) in LLDP PDUs (Link Layer Discovery Protocol Data Units).
An LLDP PDU includes 4 basic TLVs and several optional TLVs.
Basic TLVs include the Chassis ID, Port ID, TTL and End TLVs.
In L2/L3, you can select the following optional TLVs:
TLV Name | Description |
mac-phy-cfg | MAC address of the system |
management-address | Management IP address of the system |
port-description | The port description of system |
port-vlan | The VLAN ID of the port |
system-capabilities | System capability (e.g. switching, routing) |
system-description | System description |
system-name | System name |
Configuring the LLDP Mode
LLDP supports 4 modes: TxRx, Tx_only, Rx_only, and Disabled. By default, LLDP is disabled.
In TxRx mode, the system transmits and receives LLDPDUs. In Tx_only, the system only transmits LLDPDUs. In Rx_only, the system only receives LLDPDUs. In Disabled, the system will not transmit or receive any LLDPDUs.
After enabling LLDP, each interface will be in tx_rx mode by default.
You can configure the system as shown below:
admin@XorPlus# set protocols lldp enable true admin@XorPlus# set protocols lldp interface te-1/1/1 working-mode tx_rx admin@XorPlus# commit Waiting for merging configuration. Commit OK. Save done. admin@XorPlus#
Selecting Optional TLVs
admin@XorPlus# set protocols lldp tlv-select mac-phy-cfg true admin@XorPlus# set protocols lldp tlv-select management-address true admin@XorPlus# set protocols lldp tlv-select port-description true admin@XorPlus# set protocols lldp tlv-select system-capabilities true admin@XorPlus# commit Waiting for merging configuration. Commit OK. Save done. admin@XorPlus#
Displaying LLDP Information
admin@XorPlus# show protocols lldp Waiting for building configuration. enable: true tlv-select { } admin@XorPlus# run show lldp neighbor all detail Local Port: te-1/1/1 LLDP info: --------------------------------------------------------------------------------------- Time To Live: 106 Chassis Id: 68:21:5F:7F:10:C6 Port ID: te-1/1/1 Port Description: te-1/1/1 System Name: PICOS System Description: Pica8, Inc.,AS5835_54T, PICOS 4.3.2/9b1219e332 System Capability: B, RBridge, Router System Enabled Capability: Bridge, Router Management Address: 10.10.51.12 Default VLAN ID: 1 Auto Negotiation: Supported, Enabled Physical media capabilities: Others, 10base_T, 100base_TX, 100base_TXFD, 1000base_T, 1000base_TFD Media Attachment Unit type: 1000base_T_Full_Duplex 802.3 Power via MDI :Not available LLDP MED is not Enabled. Total entries displayed: 1
Configuring Other Parameters
You can configure other parameters, such as advertisement-interval, hold-time-multiplier, reinit-delay, and transmit-delay, in a similar manner.
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