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Configuring LLDP (CLI Procedure)

This topic describes:

• Enabling LLDP on Interfaces
• Adjusting LLDP Advertisement Settings
• Adjusting SNMP Notification Settings of LLDP Changes
• Specifying a Management Address for the LLDP Management TLV
• Configuring LLDP Power Negotiation

Enabling LLDP on Interfaces

LLDP is enabled on all interfaces by default. If it is disabled, you can enable LLDP by configuring it on all interfaces or on specific interfaces.

• To configure LLDP on all interfaces:
  [edit protocols lldp]
user@switch# set interface all
• To configure LLDP on a specific interface:
  [edit protocols lldp]
user@switch# set interface interface-name

Adjusting LLDP Advertisement Settings

• To specify the frequency at which LLDP advertisements are sent (in seconds):
  [edit protocols lldp]
user@switch# set advertisement-interval seconds

  For example, using the default value:

  [edit protocols lldp]
user@switch# set advertisement-interval 45
• To specify the number of seconds that LLDP information is held before it is discarded (the multiplier value is used in combination with the advertisement-interval value):
  [edit protocols lldp]
user@switch# set hold-multiplier seconds

  For example, using the default value:

  [edit protocols lldp]
user@switch# set hold-multiplier 5
• To specify the number of seconds the device delays before sending advertisements to neighbors after a change is made in a TLV (type, length, or value) element in LLDP or in the state of the local system, such as a change in hostname or management address, set the transmit delay. The transmit delay is enabled by default on switches to reduce the delay in notifying neighbors of a change in the local system. The default value is 2 seconds (if the advertisement-interval value is set to 8 seconds or more) or 1 second (if the advertisement-interval value is set to less than 8 seconds).
  [edit protocols lldp]
user@switch# set transmit-delay seconds

  For example:

  [edit protocols lldp]
user@switch# set transmit-delay 2

  Note: The advertisement-interval value must be greater than or equal to four times the transmit-delay value; otherwise, an error is returned when you attempt to commit the configuration.

Adjusting SNMP Notification Settings of LLDP Changes

• To specify the frequency at which LLDP database changes are sent (in seconds):
  [edit protocols lldp]
user@switch# set lldp-configuration-notification-interval seconds

  For example:

  [edit protocols lldp]
user@switch# set lldp-configuration-notification-interval 600
• To configure the time interval for SNMP trap notifications to wait for topology changes (in seconds):
  [edit protocols lldp]
user@switch# set ptopo-configuration-trap-interval seconds

  For example:

  [edit protocols lldp]
user@switch# set ptopo-configuration-trap-interval 600
• To specify the holding time (used in combination with the ptopo-configuration-trap-interval value) to maintain dynamic topology entries (in seconds):
  [edit protocols lldp]
user@switch# set ptopo-configuration-maximum-hold-time seconds

  For example:

  [edit protocols lldp]
user@switch# set ptopo-configuration-maximum-hold-time 2147483647

Specifying a Management Address for the LLDP Management TLV

You can configure an IPv4 or IPv6 management address to be used in the LLDP Management Address type, length, and value (TLV) messages. Only out-of-band management addresses must be used as the value for the management-address statement.

To configure the management address:

Configuring LLDP Power Negotiation

LLDP power negotiation enables the switch’s Power over Ethernet (PoE) controller to dynamically allocate PoE power to PoE interfaces, based on the needs of the powered device, by negotiating with LLDP-enabled powered devices.

Note: LLDP power negotiation is not supported on EX3200 and EX4200 (except EX4200 PX models) switches.

LLDP power negotiation is supported on switches running PoE controller software version 4.04 or later. For information about upgrading the PoE controller software, see Upgrading the PoE Controller Software.

LLDP power negotiation is automatically enabled when the PoE management mode is set to class.

• To disable LLDP power negotiation on switch interfaces:
  [edit protocols lldp interface all power-negotiation]
user@switch# disable
• To disable LLDP power negotiation on a specific switch interface:
  [edit protocols lldp interface interface-name power-negotiation]
user@switch# disable