LLDPMon

LLDPMon is a handy tool for LLDP monitoring. It’s a command line application that helps network admins spot LLDP packets zipping around Ethernet networks. This makes it super easy to figure out which switches and port numbers each device is connected to.

Requirements for LLDPMon

Before you dive in, just a heads-up: LLDPMon needs a recent version of Npcap installed on your system. It relies on Npcap to find your network adapters and listen for those Link Layer Discovery Protocol packets.

Understanding Your Network Topology

This tool can really help you map out your network’s topology and spot any connectivity hiccups. This is especially useful if you're dealing with larger networks packed with devices.

Switch Compatibility

For LLDPMon to work its magic, the switches or networking devices need to support LLDP. If LLDP isn’t turned on for all ports, then LLDPMon won’t be able to catch any packets or show you any info.

How to Use LLDPMon

When you run LLDPMon in the command console, it automatically finds the available network adapters. You’ll need to pick which interface you want to monitor. Remember, it only works on Ethernet networks and actively listens for those LLDP packets. If you want it to stop listening, just hit CTRL + C while the window is focused.

Getting Information from LLDPMon

If you run LLDPMon without any parameters, it will show you the system name and description, management addresses, as well as the port interface name along with its description. Want more detail? Use the “/detail” parameter to see everything the network device shares in the LLDP packet. Plus, if you use “/capture,” saving those packets to a file is a breeze!