Switching > Layer 2 Discovery
The NSA 2400MX uses IEEE 802.1AB (LLDP)/Microsoft LLTD protocols and 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:
http://en.wikipedia.org/wiki/Link_Layer_Topology_Discovery
http://en.wikipedia.org/wiki/Link_Layer_Discovery_Protocol
An ARP table is used to connect MAC addresses to IP addresses.
