Switching > L2 Discovery

The SonicOS appliance uses IEEE 802.1AB (LLDP)/Microsoft LLTD protocols and a switch forwarding table to discover nodes visible from a port. These are Layer 2 protocols and do not cross a broadcast domain. More information is available at the following links:

An ARP table is used to connect MAC addresses to IP addresses.

NOTE: Windows XP users need to download, install, and enable the LLTD responder driver from Microsoft.

Discovery is active when the system boots up, but then does not restart unless you click the L2 Discovery Refresh icon for a particular interface.

To restart Layer 2 discovery on multiple interfaces, select the checkbox next to the desired interfaces and then click the Refresh Selected button at the bottom of the page.