To view the Layer 2 link status between network devices and analyze the network topology, enable Link Layer Discovery Protocol (LLDP).
Procedure
Choose Configuration > Advanced Services > LLDP to display the LLDP configuration page.
Set Global LLDP status to ON so that LLDP is enabled on all interfaces.
Select the interfaces that you want to configure.
Use any of the following methods to select interfaces:
Click interface icons to select one or multiple interfaces.
Drag the mouse to select multiple adjacent interfaces.
Select the check box of the panel to select all interfaces on the panel.
Click Enable LLDP On Port or Disable LLDP On Port to enable or disable LLDP on the selected interfaces. Click Refresh to refresh information about neighbors of the selected interfaces.