Enabling LLDP Basic Optional TLVs
  • 05 Jul 2023
  • 3 Minutes to read
  • Contributors
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Enabling LLDP Basic Optional TLVs

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Article summary

This section explains the configuration for enabling basic optional TLVs for transmission.


Note: By default, transmission status is set to Disabled.

The following are the basic optionally TLVs in LLDP

  • Port Description TLV
  • System Name TLV
  • System Description TLV
  • System Capabilities TLV


Note: Configure the LLDP module status as Enabled. See Configuring LLDP Module Status.

  1. Enable basic optional TLVs by executing the following commands.
  • Enter the Global Configuration mode
your product# configure terminal
  • Enable Basic Optional TLVs on port P1.
your product(config)# interface gigabitethernet 0/1
your product(config-if)# lldp tlv-select basic-tlv port-descr sys-name sys-descr sys-capab mgmt-addr all
  • Exit from the Global Configuration mode.
your product(config)# end
  1. View the local system information by executing the following commands.
your product# show lldp local gigabitethernet 0/1
Port Id SubType : Interface Alias
Port Id : Slot0/1
Port Description : Ethernet Interface
Enabled Tx Tlvs : Port Description, System Name, System Description, System Capability, Management Address
Extended 802.3 TLV Info
-MAC PHY Configuration & Status
Auto-Neg Support & Status : Not Supported, Disabled
Advertised Capability Bits : 0000
Operational MAU Type : 0
-Link Aggregation
Capability & Status : Not Capable, Not In Aggregation
Aggregated Port Id : 1
-Maximum Frame Size : 1500
Extended 802.1 TLV Info
-Port VLAN Id : 1
-Port & Protocol VLAN Id
Protocol VLAN Id Support Protocol VLAN Status TxStatus
---------------- ------- -------------------- --------
0 Supported Enabled Disabled
-Vlan Name
Vlan Id Vlan Name TxStatus

------- --------- --------
1 Disabled
------------------------------------------------------
your product# show lldp local mgmt-addr
Management Address TxEnabledPorts
------------------ --------------
12.0.0.1 Gi0/1 Output

Enabling Specific Management Address

Management address TLV transmission status is Disabled by default; if a management address is configured for the system or the existing management address is changed, the TLV transmission status of the management address is Disabled.

Scenario 1:
If a new IP address is configured for the system, the address is not transmitted by default (the TLV transmission status of the newly configured IP address is Disabled).

  1. Create VLAN 2 with IP address 15.0.0.1 by executing the following commands.
your product# configure terminal
your product(config)# switch default
your product(config-switch)# vlan 2
your product(config-switch-vlan)# ports gigabitethernet 0/1
your product(config-switch-vlan)# end
your product# configure terminal
your product(config)# interface vlan 2
your product(config-if)# ip address 15.0.0.1 255.255.255.0
your product(config-if)# no shutdown
your product(config-if)# end
  • View the IP addresses that are configured for the system and the TLV transmission status of the addresses by executing the following command.
your product# show lldp local mgmt-addr
Management Address TxEnabledPorts
------------------ --------------
12.0.0.1 Gi0/1
15.0.0.1


Note: TxEnabledPorts for Management address 15.0.0.1 does not display any interface.

  • Enable the newly configured management address (15.0.0.1) for transmission by executing the following commands.

  • Enter the Global Configuration mode.

your product# configure terminal
  • Enable LLDP.
your product(config)# interface gigabitethernet 0/1
your product(config-if)# lldp tlv-select basic-tlv mgmt-addr ipv4 15.0.0.1
  • Exit from the Global Configuration mode.
your product(config)# end
  • View the IP addresses that are configured for the system and TLV transmission status of the addresses by executing the following command.
your product# show lldp local mgmt-addr
Management Address TxEnabledPorts
------------------ --------------
12.0.0.1            Gi0/1
15.0.0.1            Gi0/1

Scenario 2:

If the IP address for the existing IP interface is changed, the address is treated as deletion of one management address and addition of new management address by LLDP.


Note: VLAN 2 is configured with IP address 15.0.0.1 and is enabled for interface gigabitethernet 0/1.

  1. Change the IP address of VLAN 2 as 16.0.0.1 by executing the following commands
your product# configure terminal
your product(config)# interface vlan 2
your product(config-if)# shutdown
your product(config-if)# ip address 16.0.0.1 255.255.255.0
your product(config-if)# no shutdown
your product(config-if)# end


Note: The following is the impact of the change in the IP address of VLAN 2 as 16.0.0.1.

The entry corresponding to the old IP address of VLAN 2 is deleted from the LLDP management address table.

The entry corresponding to 16.0.0.1 is created.

The TLV transmission status of 16.0.0.1 is disabled by default.


  • View the IP addresses that are configured for the system and the TLV transmission status of the addresses by executing the following command.
your product# show lldp local mgmt-addr
Management Address TxEnabledPorts
------------------ --------------
12.0.0.1 Gi0/1
16.0.0.1


Note: TxEnabledPorts for Management address 16.0.0.1 does not display any interfaces; the newly configured IP address 16.0.0.1 is not advertised through interface gigabitethernet 0/1, and the entry corresponding to IP address 15.0.0.1 is deleted from remote table.

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