This paper introduces a methodology to performs link layer network mapping. As far as I know this is the most generic method to do so. It relies on Variable Packet Size capacity to infers the number of switchs present on the network. It is nice because it does not requires switch to have SNMP agents. This method does not work on other network device than store and forward switch, such as hub for instance. The paper provide link to various implementation that use VPS discovery algorithm. This paper is part of the PAM 2005 workshop and was written by Shane Alcock (University of Waikato), Anthony McGregor (University of Waikato), and Richard Nelson (University of Waikato).
Using Simple Per-Hop Capacity Metrics to Discover Link Layer Network Topology (pdf version)
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