The aim of L2Discover is to discover the second layer topology of a switched network.
The main goal was to implement a simple desktop application that can be used as a layer 2
ping and traceroute to map the current network topology.

Features:
As the information source of the topology the following sources have been used:
 

• Cisco Discovery Protocol:
  If your equipment does not support this protocol the tool will not be able to generate the porper map.
• Spanning Tree Protocol (Rapid Spanning Tree Protocol):
  This information is used to find the redundant links.
• Filtering Address Base:
  It is used to locate the unmanagable devices on the network.
  If situated on a port there are several MAC addresses and the port is not part of the STP or CDP topology then it is highly probable that there is an unmanaged switch or hub.

L2Discover installation guide

You can download the package from: https://sourceforge.net/projects/l2discover
This software was developed for use with java 1.5 or higher. You need Java 1.5_1 or higher installed on your system
to use this software. You can download the latest Java environment from the http://java.sun.com site.

In this program the folowing components have benn incorporated:
* SNMP4j (http://www.snmp4j.org/ )
* Prefuse (http://prefuse.sourceforge.net/)
* XStream (http://xstream.codehaus.org/)
 

You have to download and copy the following files into your JAVA_HOME\lib\ext directory:

* Snmp4j.jar
* xstream-1.1.2.jar
 

After completing this you can start the l2discover.jar file with java –jar l2discover.jar.