STP and RSTP on Cisco IOS-XE: Troubleshooting Loops, PortFast, BPDU Guard, and Root Bridge Control
A practical deep dive into Spanning Tree Protocol and RSTP on Cisco IOS-XE. Covers root bridge election, PortFast, BPDU Guard, Root Guard, Loop Guard, Bridge Assurance, TCN storm troubleshooting, and Catalyst 9000 gotchas with real show command output.