Topology Discovery

This dialog enables you to activate/deactivate the function for Topology Recognition (LLDP) and to display the LLDP information received in the form of a table.

LLDP Information from Neighbor Devices

The table on the “LLDP” tab page shows you the collected LLDP information for neighboring devices. This information enables the network management station to map the structure of your network.

Activating “Display FDB entries” below the table allows you to add entries for devices without active LLDP support to the table. In this case, the device also includes information from its FDB (forwarding database).

The table shows you which LLDP-MED information the device received on its ports from other devices.

Tab. Topology discovery (LLDP information)

Parameters

Meaning

“Port”

Port identification using module and port numbers of the device, e.g. 2.1 for port one of module two.

Neighbor Identifier

Chassis ID of the neighboring device. This can be the basis MAC address of the neighboring device, for example.

Neighbor IP Address

Management address of the neighboring device. This can be an IPv4 address, for example.

Neighbor Port Description

Port description of the neighboring device. The port description is an alphanumeric string.

Neighbor System Name

System name of the neighboring device. The system name is an alphanumeric string.

Neighbor ‍System Description

System description of the neighbor device, according to IEEE 802.1AB.


If several devices are connected to one port, for example via a hub, the table will contain one line for each connected device.

When devices both with and without an active topology discovery function are connected to a port, the topology table hides the devices without active topology discovery.

When only devices without active topology recognition are connected to a port, the table will contain one line for this port to represent all devices. This line contains the number of connected devices.

You can find the MAC addresses of devices, which the topology table hides for clarity's sake, in the address table (FDB), (refer Filter for MAC addresses).