N Is For Networking N4N015: Spanning Tree Part 3 – Versions, States and Guards
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Feb 27, 2025 Delve into the fascinating world of spanning tree protocols as versions like 802.1D, 802.1w, and 802.1s are explored. Learn about the critical importance of BPDU guard in preventing network loops. The discussion covers the impact of switch port states on DHCP functionality and the significance of edge ports for maintaining connectivity. With insights into network design and stability, the conversation wraps up by highlighting modern technologies that enhance network efficiency. Join the journey of collaborative learning and skill development in networking!
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Spanning Tree Versions and Load Balancing
- Spanning Tree Protocol (STP) has several versions, including 802.1D (original), 802.1w (rapid), and 802.1s (multiple).
- Multiple spanning tree (MSTP) allows running multiple STP instances, mapping VLANs to different instances for load balancing.
Edge Port Troubles
- Ethan Banks recalls troubleshooting a client's network issue where PCs would intermittently fail to get IP addresses.
- The problem stemmed from switch ports not being in edge port mode, causing delays in DHCP requests.
BPDU Guard for Edge Ports
- When configuring edge ports for immediate transition to forwarding, also configure BPDU Guard.
- BPDU Guard shuts down the port if a BPDU is received, preventing loops.