The available extensions are spanning tree edge ports (which supply the functionality previously known as PortFast), Bridge Assurance, BPDU Guard, BPDU Filtering, Loop Guard, Root Guard, and PVT Simulation.. Root Guard protects the Spanning Tree Protocol (STP) topology attack of replacing the original Root Bridge with a rogue Root Bridge. When a Root Guard feature enabled switch port receives a superior BPDU from a rogue switch, the state of the port is changed into a root-inconsistent state, thus enforcing the position of original Root Bridge.
Cisco Spanning Tree Protocol (STP) Explained TechBranches
What Is Root Guard and How to Enable It
Multiple Spanning Tree (MST)
Spanning Tree Protocol STP Root Bridge Election Procedure The Network DNA
How to Configure Cisco Switch as Root Bridge Solutions
Spanning Tree BPDU Guard
What Is Root Guard and How to Enable It
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Root guard allows the device to participate in STP as long as the device does not try to become the root. If root guard blocks the port, subsequent recovery is automatic. Recovery occurs as soon as the€deviant€device ceases to send superior BPDUs. For more information about BPDU guard, see€Spanning Tree PortFast BPDU Guard Enhancement.. Switch# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch#(config)# interface fastethernet 3/1 Switch#(config-if)# spanning-tree guard root On the Cisco Switches Catalyst 2900XL, 3500XL, 2950, and 3550, we configure root guard as shown: Switch# configure terminal Enter configuration commands, one per line.
