Deployment Guide

• pvst: enables root guard on a PVST-enabled port.
To disable STP root guard on a port or port-channel interface, use the no spanning-tree 0 rootguard command in an interface
conguration mode.
To verify the STP root guard conguration on a port or port-channel interface, use the show spanning-tree 0 guard
[interface interface] command in a global conguration mode.
SNMP Traps for Root Elections and Topology
Changes
To enable SNMP traps, use the following commands.
• Enable SNMP traps for STP state changes.
snmp-server enable traps stp
• Enable SNMP traps for RSTP, MSTP, and PVST+ collectively.
snmp-server enable traps xstp
Displaying STP Guard Conguration
To display the STP guard conguration, use the following command.
The following example shows an STP network (instance 0) in which:
• Root guard is enabled on a port that is in a root-inconsistent state.
• Loop guard is enabled on a port that is in a listening state.
• BPDU guard is enabled on a port that is shut down (Error Disabled state) after receiving a BPDU.
• Verify the STP guard congured on port or port-channel interfaces.
show spanning-tree 0 guard [interface interface]
Example of Viewing STP Guard Conguration
Dell#show spanning-tree 0 guard
Interface
Name Instance Sts Guard type Bpdu Filter
--------- -------- --------- ---------- ----------
Tengig 0/1 0 INCON(Root) Rootguard No
Tengig 0/2 0 LIS Loopguard No
Tengig 0/3 0 EDS (Shut) Bpduguard No
Dell#
Spanning Tree Protocol (STP)
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