Dell Networking PowerSwitch OS9: How to enable and manage the Link Layer Discovery Protocol

Summary: This article explains how to enable and manage Link Layer Discovery Protocol (LLDP) on Dell Networking switches running OS9.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
Check out other resources

Instructions

Objectives

1. Important Points
2. Configure LLDP
2. View LLDP configuration
4. View Information Advertised by Adjacent LLDP Agents

 

Important Points

  • LLDP is enabled by default starting at firmware release 9.2.0.2. Prior versions LLDP is disabled by default.
  • Dell Networking systems support up to eight neighbors per interface.
  • Dell Networking systems support a maximum of 8000 total neighbors per system. If the number of interfaces multiplied by eight exceeds the maximum, the system does not configure more than 8000.
  • Interface level configurations override all configuration level configurations.

 

Configure LLDP
 

Command

Purpose

FTOS# configure

Enter configuration mode.

FTOS(config)# protocol LLDP

Enter LLDP mode.

FTOS(config-lldp)# no disable

Disable turns off LLDP globally. No disable turns on LLDP globally. Since the protocol was introduced as "disabled" then the negative of that statement turns on the protocol.

FTOS(conf-if-te-0/10)#protocol lldp

The same LLDP mode is found at the interface level. All specific interface level LLDP mode commands override any globally configured LLDP parameters.

 

View LLDP Configuration

 

Dell(conf)# protocol lldp

Dell(conf-lldp)# show config
!
protocol lldp
advertise dot1-tlv port-protocol-vlan-id port-vlan-id
advertise dot3-tlv max-frame-size
advertise management-tlv system-capabilities system-description hello 10
no disable

Dell(conf-lldp)# exit

Dell(conf)# interface gigabitethernet 1/31

Dell(conf-if-gi-1/31)# show config
!
interface GigabitEthernet 1/31
no ip address
switchport
no shutdown
Dell(conf-if-gi-1/31)# protocol lldp

Dell(conf-if-gi-1/31-lldp)# show config
!
protocol lldp

View Information Advertised by Adjacent LLDP Agents
 

Display brief information about adjacent devices.

show lldp neighbors

Display all the information that neighbors are advertising.

show lldp neighbors detail

 

Example of viewing Brief Information Advertised by Neighbors

Dell(conf-if-te-0/3-lldp)# end

Dell (conf-if-te-0/3)# do show lldp neighbors

Loc      PortID      Rem Host Name        Rem Port Id                Rem Chassis Id
---------------------------------------------------------------------------------------------

Te 0/1                     -                     TenGigabitEthernet 0/5      00:01:e8:05:40:46
Te 0/2                     -                     TenGigabitEthernet 0/6      00:01:e8:05:40:46

 

Example of Viewing Details Advertised by Neighbors

Dell# show lldp neighbors detail
========================================================================
Local Interface Te 0/4 has 1 neighbor
Total Frames Out: 6547
Total Frames In: 4136
Total Neighbor information Age outs: 0
Total Frames Discarded: 0
Total In Error Frames: 0
Total Unrecognized TLVs: 0
Total TLVs Discarded: 0
Next packet will be sent after 7 seconds
The neighbors are given below:
-----------------------------------------------------------------------

Remote Chassis ID Subtype: Mac address (4)
Remote Chassis ID: 00:01:e8:06:95:3e
Remote Port Subtype: Interface name (5)
Remote Port ID: TeGigabitEthernet 2/11
Local Port ID: TenGigabitEthernet 1/21
Locally assigned remote Neighbor Index: 4
Remote TTL: 120
Information valid for next 120 seconds
Time since last information change of this neighbor: 01:50:16
Remote MTU: 1554
Remote System Desc: Dell Networks Real Time Operating System Software
Dell Operating System Version: 1.0.
Dell Application Software Version: 9.4.0.0. Copyright (c) 1999-2014
Build Time: Thu Aug 9 01:05:51 PDT 1999-2014
Existing System Capabilities: Repeater Bridge Router
Enabled System Capabilities: Repeater Bridge Router
Remote Port Vlan ID: 1
Port and Protocol Vlan ID: 1, Capability: Supported, Status: Enabled

---------------------------------------------------------------------------

Affected Products

PowerSwitch S3048-ON, PowerSwitch S4048-ON, PowerSwitch S4810P, PowerSwitch S4810-ON, PowerSwitch S4820T, PowerSwitch S5000, Force10 S60-44T, PowerSwitch S6000, PowerSwitch S6000 ON, PowerSwitch S4048T-ON, PowerSwitch S5048F-ON, PowerSwitch S6010-ON , PowerSwitch S6100-ON, PowerSwitch Z9100-ON ...
Article Properties
Article Number: 000120105
Article Type: How To
Last Modified: 31 Dec 2025
Version:  8
Find answers to your questions from other Dell users
Support Services
Check if your device is covered by Support Services.