Discovery

Link Layer Discovery Protocol (LLDP) (also known as 802.1ab) is an industry-standard protocol designed to supplant proprietary Link-Layer protocols such as Extreme's Discovery Protocol (EDP) and Cisco Discovery Protocol (CDP). The goal of LLDP is to provide an inter-vendor compatible mechanism to deliver Link-Layer notifications to adjacent network devices. LLDP is useful in obtaining information about an external power device, such as a Wireless Access Point (WAP).

WAPs are treated as external devices that are configured using the LLDP profile to set up inventory information (e.g., manufacturer’s name) and LLDP-MED Power extensions, if the device fully supports those extensions, it designates peak power required by the device.

The following table displays the LLDP attributes.

 

Parameter

Description

Option(s)

LLDP

Admin State

Specifies the Link Layer Discovery Protocol (LLDP) mode.

  • LLDP manages LAG ports individually. LLDP sends separate advertisements on each port in a LAG. LLDP data received through LAG ports is stored individually per port.
  • An LLDP operation on a port is not dependent on the STP state of a port. This means that LLDP frames are sent and received on blocked ports. If a port is controlled by 802.1X, LLDP operates only if the port is authorized.

Disabled, TxOnly, RxOnly, TxRx (default)
LLDP-MED Parameter.
MED Fast Start Repeat Count Enables a device to initially advertise itself at a faster rate for a limited time when an LLDP-MED Endpoint has been newly detected or connected to the network. Default is 4.

Tx

TX Interval(s)

Specifies, in seconds, how often the software sends an LLDP update.

5 - 32768 seconds. Default is 30 seconds.

TX Hold Multiplier

Specifies the hold time to be sent in the LLDP update packets as a multiple of the timer value

2 - 10. Default is 4.

TX Hold Time(s)

Specifies the LLDP hold time, delay time, and update frequency configuration.

Default is 120 seconds

TX Delay(s)

Specifies the delay, in seconds, between successive LLDP frame transmissions initiated by value/status changes in the LLDP local systems MIB

1 - 8192 seconds. Default is 2 seconds.
TX Re-Init Delay(s) Specifies the minimum time, in seconds, an LLDP port waits before re-initializing LLDP transmissions.

1 - 10 seconds. Default

is 2 seconds.
Rx
RX Notification Interval(s) Specifies the number of seconds to elapse between LLDP notifications.The notification interval prevents multiple notifications occurring within the given time. 5 - 3600 seconds. Default is 5 seconds.

 

The user has control of the Tx and Rx configuration and statistics of the LLDP Parameters.

Configuration

 

  1. When clicking on the Discovery button, the Configuration screen will be displayed.
  2. Make the necessary changes to the LLDP parameters and click on  the Apply button to add the changes to the protocol.

Statistics

Click on the Statistics button to display the current values of LLDP protocols.