Managing the Link Layer Discovery Protocol (LLDP)
  • 14 Jun 2022
  • 3 Minutes to read
  • Contributors
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Managing the Link Layer Discovery Protocol (LLDP)

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Article summary

Link Layer Discovery Protocol (LLDP) is a protocol that allows stations attached to an IEEE 802 LAN to advertise to one another. Three types of information are advertised: the major capabilities provided by the system incorporating that station, the corresponding management addresses, and the identification of the station’s point of attachment to the IEEE 802 LAN required by those management entities.

The unit uses LLDP to advertise connectivity and management information about itself to adjacent stations, as well as to receive and display network management information from adjacent stations residing on the same IEEE 802 LAN.

To view and manage LLDP information

  1. Access the page Show ▶LLDP.
    The total number of ports found in the system is given in the lower-left corner of the page, as well as the index values of the ports currently displayed on-screen (for example, [1-25] of 254). Use the page navigation links in the lower-right corner of the page to move between the pages of results.

  2. (Optional) To limit the view to only certain ports, enter a value on which to filter, then click Search.


    Note: Enter an asterisk ( * ) as a wildcard to replace one or several characters.

  3. To view detailed LLDP information related to a specific port, click the Port Name in the LLDP Configuration sections, details pertaining to the selected port are displayed.

  4. Manage how LLDP frames are transmitted on this port using the Enable, Forward and Rate parameters of the LLDP Configuration section.

For more information on specific parameters, refer to the table at the end of this section.

Show ▶LLDP

Skylight element LX v7.9_4.bmp

LLDP (Show ▶LLDP)

LLDP Neighbors

ParameterDescription
TimestampDate and time of the last update.
Source MAC AddressMAC address of the remote system connected to this port.
System NameName of the remote system connected to this port.
System DescriptionDescription of the remote system connected to this port.
Port IDRemote system port identifier.
Mgt AddressIP address for remote system management.

Note: There may be more than one such address.

If indexThe interface index value used to identify the port associated with this management IP address.
TTLTime To Live (TTL) of the last received LLDPDU frame.

LLDP Statistics

ParameterDescription
AgeoutsThe number of age-outs that occurred on a given port.

An age-out is the number of times the complete set of information advertised by a particular MSAP has been deleted because the information timeliness interval has expired.

Input Frames DiscardedThe number of LLDP frames received by this LLDP agent on the indicated port, then discarded for any reason.
Input Frames ErrorsThe number of invalid LLDP frames received by this LLDP agent on the indicated port while this LLDP agent is enabled.
Input Frames TotalThe number of valid LLDP frames received by this LLDP agent on the indicated port while this LLDP agent is enabled
Input TLVs DiscardedThe number of LLDP TLVs discarded for any reason by this LLDP agent on the indicated port.
Input TLVs UnrecognizedThe number of LLDP TLVs received on the selected port that are not recognized by this LLDP agent.
Output Frames TotalA count of all LLDP frames sent on the indicated port.
Output Length ErrorsThe number of LLDPDU Length Errors recorded for the indicated port.

LLDP Local-info

ParameterDescription
Source MAC AddressMAC address of the local port.
System NameName of the local system connected to this port as defined by the host name in the DNS settings. By default, it is the unit's serial number.
System DescriptionDescription of the local system.
Port IDPort identifier.
Mgt AddressIP address for local system management (there may be more than one).
If indexThe interface index value used to identify the port associated with this management IP address.
TTLTime To Live (TTL) of the LLDPDU frames transmitted on this port. This value is automatically set by the system to [4 x Tx Rate + 1 second].

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