LLDP Configuration

show lldp neighbors

[Command]

**show lldp neighbors ** [interface_name]

show lldp table

[Purpose]

Show LLDP neighbors

[Parameter]

Parameter	Description
interface_name	Interface name

[View]

System view

[Use Cases]

sonic# show lldp table
Capability codes: (R) Router, (B) Bridge, (O) Other
LocalPort  RemoteDevice   RemotePortID     Capability  RemotePortDescr
---------- ---------------- -----------------    ------------ ---------------
Ethernet15  sonic       32:31:9b:9b:1c:18  BR         Ethernet15
Ethernet19  76-Server      ac:1f:6b:78:00:af  BR         eno2
Ethernet25  sonic        G25          BR         Ethernet25
Ethernet47  sonic        Ethernet47       BR         Ethernet47
Ethernet50  2-20-1        Ethernet15       BR         Ethernet15
Ethernet51  sonic        Ethernet53       BR         Ethernet53
eth0                 e4:54:e8:ce:f6:8e
--------------------------------------------------
Total entries displayed: 7
sonic# show lldp neighbor Ethernet15
-------------------------------------------------------------------------------
LLDP neighbors:
-------------------------------------------------------------------------------
Interface:  Ethernet15   , via: LLDP, RID: 1, Time: 1 day, 08:51:31
 Chassis:
  ChassisID:  mac 18:17:25:37:65:40
  SysName:   spine-228
  SysDescr:   Debian GNU/Linux 9 (stretch) Linux 4.9.0-14-2-amd64 #1 SMP Debian 4.9.246-2 (2020-12-17) x86_64
  MgmtIP:    10.250.0.228
  MgmtIface:  2
  Capability:  Bridge, on
  Capability:  Router, on
  Capability:  Wlan, off
  Capability:  Station, off
 Port:
  PortID:    local C1
  PortDescr:  0/0
  TTL:      120
-------------------------------------------------------------------------------

show lldp table

[Command] show lldp table

[Purpose] Show interface LLDP neighbor

[View] System View

[Use Cases]

sonic# show lldp table
Capability codes: (R) Router, (B) Bridge, (O) Other
LocalPort    RemoteDevice    RemotePortID           Capability    RemotePortDescr
-----------  --------------  ---------------------  ------------  --------------------------
Ethernet1    sonic           Ethernet50             BR            Ethernet50
Ethernet7    sonic           Ethernet11             BR            Y11
Ethernet8    sonic           Ethernet11             BR            Y11

show lldp config

[Command] show lldp config

[Purpose] Show LLDP configuration

[View] System View

[Use Cases]

sonic# show lldp config
LLDP Enable:             enabled
LLDP Management IP:      30.102.0.144
LLDP Port ID Subtype:    macaddress
LLDP Dots Power:         disable
LLDP Med Power:          disable
+-------------+--------------------+
| Interface   | LLDP Transparent   |
+=============+====================+
| Ethernet1   | enable             |
+-------------+--------------------+

show lldp ports med-policy

[Command]

show lldp ports med-policy

[Purpose]

Display interface LLDP MED configuration policy

[View]

System view

[Use Cases]

sonic# show lldp ports med-policy
+------------+---------------+--------+----------+------------+--------+
| Ports      | application   | vlan   | tagged   | priority   | dscp   |
+============+===============+========+==========+============+========+
| Ethernet20 | voice         | 20     | NA       | NA         | NA     |
+------------+---------------+--------+----------+------------+--------+

lldp enable

[Command]

lldp enable

no lldp enable

[Purpose]

Enable LLDP

[View]

System configuration view

[Use Cases]

sonic(config)# lldp enable

lldp mgmt-ip

[Command]

lldp mgmt-ip A.B.C.D

[Purpose]

Configure the management IP address of LLDP

[View]

System configuration view

[Usage Scenario]

Configuring a management address is useful for clearly identifying a device, aiding in network topology mapping, and facilitating network management. When there’s a need to advertise a specific management address to neighbors, this command is used for configuration.

[Notes]

The management address is carried in the Management Address TLV field of LLDP packets, uniquely identifying a device. By default, it is set to the IP address of the management interface. If the management interface address is not configured, it will default to the Docker container’s internal address.

[Use Cases]

sonic(config)# lldp mgmt-ip 10.1.0.15

lldp port-id-subtype

[Command]

lldp port-id-subtype {macaddress|ifname}

[Purpose]

Configure the interface ID type of LLDP

[Parameter]

Parameter	Description
macaddress	MAC Address
ifname	Interface Name

[View]

System configuration view

[Usage Scenario]

In the LLDP table, the interface IP used in the mode is the device’s interface name. To clearly identify interconnected devices, you can configure the interface ID type as a MAC address. By default, the interface ID type is set to “ifname.”.

[Use Cases]

sonic(config)# lldp port-id-subtype macaddress

lldp ports med-policy

[Command]

lldp ports med-policy voice [vlan vlan_id ] [vlan-type {tagged|untagged}] [priority priority ] [dscp dscp ]

[Purpose]

Configure interface to publish MED TLV

[Parameter]

Parameter	Description
vlan_id	Confgure the VLAN ID of voice-vlan, video-vlan
priority	Cos priority
dscp	DSCP priority

[View]

Interface view

[Usage Scenario]

An LLDPDU is the basic unit of communication in the LLDP protocol, and all device configuration information to be sent is encapsulated within LLDPDUs. Different TLVs are used to transmit or receive information about oneself and neighboring devices. By configuring TLVs to be advertised on an interface, you can automatically configure information such as the IP phone VLAN and priority associated with devices connected to that interface.

[Use Cases]

sonic(config)# interface ethernet 1
sonic(config-if-1)# lldp ports med-policy voice vid 100 vlan-type tagged priority 1