Yet another new topic on the new CCNA R/S v3 exam is BPDUGuard, which is an enhancement to Spanning Tree Protocol (STP) available on our Cisco Catalyst switches. Specifically, BPDUGuard can help prevent a Layer 2 topological loop by placing a port configured for PortFast into an Error-Disabled state if that port receives a Bridge Protocol Data Unit (BPDU).
This video demonstrates the operation of BPDUGuard, and then trains you on how to configure this simple yet powerful feature.
Kevin Wallace, CCIEx2 (R/S and Collaboration) #7945
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