Configuring LLDP

You configure LLDP by including the lldp statement and associated parameters at the [edit protocols] hierarchy level. The complete set of LLDP statements follows:

The following statements have default values:

• advertisement-interval—The default value is 30 seconds. The allowable range is from 5 through 32768 seconds.

• chassis-id-type—The default value is MAC address.

• chassis-id-value—The default value is system-mac.

• hold-multiplier—The default values is 4. The allowable range is from 2 through 10.

• ptopo-configuration-maximum-hold-time—The default value is 300 seconds. The allowable range is from 1 through 2147483647 seconds.

• transmit-delay—The default values is 2 seconds. The allowable range is from 1 through 8192 seconds.

The following statements must be explicitly configured:

• lldp-configuration-notification-interval—The allowable range is from 5 through 3600 seconds. The default value is 5.

• ptopo-configuration-trap-interval—The allowable range is from 0 through 3600 seconds. The default value is 0.

By default, LLDP is disabled, and user must configure it using [set protocols lldp interface (all | interface-name)] to use the LLDP services. If it is enabled for all interfaces, you can disable LLDP on specific interfaces.

Note:

The interface-name must be the physical interface (for example, ge-1/0/0) and not a logical interface (unit).

Starting in Junos OS Release 19.4R2, you can configure the LLDP on redundant Ethernet (reth) interfaces. Use the set protocol lldp interface <reth-interface> command to configure LLDP on reth interface.

Starting in Junos OS Release 22.1R1, you can configure alternate LLDP destination mac addresses. If no configuration is provided, then the packets are sent to the nearest-bridge mac-address, which is 01:80:c2:00:00:0e. Use the set protocols lldp dest-mac-type <mac-type> statement to configure packets sent out of all interfaces. And use the set protocols lldp interface <intf-name> dest-mac-type <mac-type> statement for packets sent out of a specific interface.

• To configure LLDP on all interfaces:

• To configure LLDP on a specific interface:

To disable LLDP, include the disable option:

• To disable LLDP on all interfaces:

• To disable LLDP on a specific interface:

The advertisement interval determines the frequency that an LLDP interface sends LLDP advertisement frames. The default value is 30 seconds. The allowable range is from 5 through 32768 seconds. You adjust this parameter by including the advertisement-interval statement at the [edit protocols lldp] hierarchy level.

The hold multiplier determines the multiplier to apply to the advertisement interval. The resulting value in seconds is used to cache learned LLDP information before discard. The default value is 4. When used with the default advertisement interval value of 30 seconds, this makes the default cache lifetime 120 seconds. The allowable range of the hold multiplier is from 2 through 10. You adjust this parameter by including the hold-multiplier statement at the [edit protocols lldp] hierarchy level.

The transmit delay determines the delay between any two consecutive LLDP advertisement frames. The default value is 2 seconds. The allowable range is from 1 through 8192 seconds. You adjust this parameter by including the transmit-delay statement at the [edit protocols lldp] hierarchy level.

The physical topology configuration maximum hold time determines the time interval for which an agent device maintains physical topology database entries. The default value is 300 seconds. The allowable range is from 1 through 2147483647 seconds. You adjust this parameter by including the ptopo-configuration-maximum-hold-time statement at the [edit protocols lldp] hierarchy level.

The LLDP configuration notification interval determines the period for which trap notifications are sent to the SNMP Master Agent when changes occur in the database of LLDP information. The allowable range is from 5 through 3600 seconds. You adjust this parameter by including the lldp-configuration-notification-interval statement at the [edit protocols lldp] hierarchy level.

The physical topology configuration trap interval determines the period for which trap notifications are sent to the SNMP Master Agent when changes occur in the global physical topology statistics. This capability is disabled by default. The allowable range is from 0 (disabled) through 3600 seconds. The LLDP agent sends traps to the SNMP Master Agent if this interval has a value greater than 0 and there is any change during the lldp-configuration-notification-interval trap interval. You adjust this parameter by including the ptopo-configuration-trap-interval statement at the [edit protocols lldp] hierarchy level.

You can specify the destination MAC address for LLDP. The options are nearest-bridge, nearest-customer-bridge, and nearest-non-tpmr-bridge.

By default, the management interface of the device is used in the management address TLV of the LLDP PDU. You can configure the management address or the management interface for LLDP.

If you configure the management address, that address is sent in the management address TLV. If you configure the management interface, the IP address of the management interface is sent in the TLV. If the management interface does not have an IP address, the default IP address of the device's management interface is sent in the TLV. If the device's management interface does not have an IP address, the MAC address of the management interface is sent in the TLV.

By default, LLDP generates the SNMP index of the interface for the port ID Type, Length, and Value (TLV). When the interface-name statement is configured on the remote LLDP neighbor, the show lldp neighbors command output displays the interface name in the Port ID field rather than the SNMP index of the interface, which is displayed by default. If you change the default behavior of generating the SNMP index of the interface as the Port ID TLV, you can reenable the default behavior by including the locally-assigned statement at the [edit protocols lldp port-id-subtype] hierarchy level.