show lldp

LLDP

LLDP operating state. The state can be enabled or disabled.

Advertisement interval

Frequency, in seconds, at which LLDP advertisements are sent.

This value is set by the advertisement-interval configuration statement.

Transmit delay

Seconds of delay before advertisements are sent to neighbors following a change to a TLV (type, length, or value) element in the LLDP protocol or to the state of the local system, such as a change in hostname or management address. You can set this value to reduce the delay in notifying neighbors of a change in the local system.

This value is set by the transmit-delay configuration statement.

Hold timer

On EX4300 switches, the hold timer shows the length of time LLDP information is held before it is discarded. The hold timer value is equal to the advertisement interval multiplied by the hold multiplier.

On all other switches, the hold timer shows the value of the hold multiplier.

The hold multipler value is set by the hold-multiplier configuration statement.

Notification interval

How often LLDP trap notifications are generated as a result of LLDP database changes. If the interval value is 0, LLDP trap notifications on database changes are disabled.

This value is set by the lldp-configuration-notification-interval configuration statement.

Config Trap Interval

How often LLDP trap notifications are generated as a result of changes in topology—for example, when an endpoint connects or disconnects. If the interval value is 0, LLDP trap notifications on topology changes are disabled.

This value is set by the ptopo-configuration-trap-interval configuration statement.

Connection Hold timer

Amount of time the system maintains dynamic topology entries.

This value is set by the ptopo-configuration-maximum-hold-time configuration statement.

• interface-name—Indicates the interface name as the port information for the local device.

• locally-assigned—Indicates that the sub-type for port ID TLV generation is locally assigned value of SNMP index of the interface.

Following value used for port description TLV:

• interface-alias (ifAlias)—Indicates that the ifAlias MIB object value is used to generate the port description TLV.

• interface-description (ifDescr)—Indicates that the ifDescr MIB object value is used to generate the port description TLV.

LLDP-MED

LLDP-MED operating state. The state can be Enabled or Disabled.

MED fast start count

Number of advertisements sent from a switch to a device, such as a VoIP telephone, when the device is first detected by the switch. These increased advertisements are temporary. After a device and a switch exchange information and can communicate, advertisements are reduced to one per second.

This value is set by using the fast-start configuration statement.

Interface

Name of the interface for which LLDP configuration information is being reported.

Parent Interface

Name of the aggregated Ethernet interface, if any, to which the interface belongs.

LLDP

LLDP operating state. The state can be Enabled or Disabled.

Power Negotiation

LLDP power negotiation operating state. The state can be Enabled or Disabled.

Neighbor count

Total number of new LLDP neighbors detected since the last switch reboot.

Interface

Name of the interface that is advertising VLAN information.

Vlan-id

VLAN tag associated with the interface sending LLDP frames. If the interface is not a member of a VLAN, the VLAN ID is advertised as 0.

Vlan-name

VLAN name associated with the VLAN ID.

For switches running Junos OS releases with Enhanced Layer 2 Software (ELS), this column displays the string vlan-vlan-id by default. Starting in Junos OS Release 15.1X53-D59 and 18.2R1, you can configure the vlan-name-tlv-option name option at the [edit protocols lldp] hierarchy level to transmit the VLAN name in the LLDP VLAN name TLV in place of the VLAN ID, and display the actual VLAN name in this output field instead.

LLDP basic TLVs supported

Basic TLVs supported on the switch:

• Chassis identifier—TLV that advertises the MAC address associated with the local system.

• Port identifier—TLV that advertises the port identification for the specified port in the local system.

• Port description—Interface name for the port.

• System name—TLV that advertises the user-configured name of the local system.

• System description—TLV that advertises the system description containing information about the software and current image running on the system. This information is taken from the software and is not configurable.

• System capabilities—TLV that advertises the primary functions performed by the system—for example, bridge or router.

• Management address—TLV that advertises the IP management address of the local system.

Supported LLDP 802 TLVs

802.3 TLVs supported on the switch:

• MAC/PHY configuration status—TLV that advertises information about the physical interface, such as autonegotiation status and support and MAU type. The information is based on the physical interface structure and is not configurable.

• Power via MDI—TLV that advertises MDI power support, PSE power pair, and power class information.

• Link aggregation—TLV that advertises if the interface is aggregated and its aggregated interface ID.

• Maximum frame size—TLV that advertises the maximum transmission unit (MTU) of the interface sending LLDP frames.

• Port VLAN tag—TLV that advertises the VLAN tag configured on the interface.

• Port VLAN name—TLV that advertises the VLAN name configured on the interface.

Supported LLDP MED TLVs

LLDP-MED TLVs supported on the switch:

• LLDP MED capabilities—TLV that advertises the primary function of the port. The capabilities values range from 0 through 15:

  • 0—Capabilities

  • 1—Network Policy

  • 2—Location Identification

  • 3—Extended Power via MDI-PSE

  • 4—Inventory

  • 5–15—Reserved

• Network policy—TLV that advertises the port VLAN configuration and associated Layer 2 and Layer 3 attributes. Attributes include the policy identifier, application types—such as voice or streaming video—802.1Q VLAN tagging, and 802.1p priority bits and DiffServ code points.

• Endpoint location—TLV that advertises the physical location of the endpoint.

• Extended power Via MDI—TLV that advertises the power type, power source, power priority, and power value of the port. It is the responsibility of the PSE device (network connectivity device) to advertise the power priority on a port.