DELL S50V User Manual

Spanning Tree Protocol | 1063

You enable STP root guard on a per-port or per-port-channel basis. 

To enable the root guard on an STP-enabled port or port-channel interface in instance 0, enter the 

 command:

To disable STP root guard on a port or port-channel interface, enter the 

 

command in an interface configuration mode.

To verify the STP root guard configuration on a port or port-channel interface, enter the 

[

 

] 

command in global configuration mode.

•

Enable SNMP traps for Spanning Tree state changes using the command 

.

•

Enable SNMP traps for MSTP using the command 

.

FTOS Behavior: The following conditions apply to a port enabled with STP root guard:
•

Root guard is supported on any STP-enabled port or port-channel interface except when used as a stacking 
port.

•

Root guard is supported on a port in any Spanning Tree mode:

•

•

•

 (MSTP)

•

•

When enabled on a port, root guard applies to all VLANs configured on the port.

•

Root guard and loop guard cannot be enabled at the same time on an STP port. For example, if you 
configure root guard on a port on which loop guard is already configured, the following error message is 
displayed: 

% Error: LoopGuard is configured. Cannot configure RootGuard.

•

When used in an MSTP network, if root guard blocks a boundary port in the CIST, the port is also blocked 
in all other MST instances.

Enable root guard on a port or port-channel interface.
0

: 

Enables root guard on an STP-enabled port assigned to 

instance 0.
mstp

: 

Enables root guard on an MSTP-enabled port.

: 

Enables root guard on an RSTP-enabled port.

: 

Enables root guard on a PVST-enabled port.

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INTERFACE

INTERFACE 
PORT-CHANNEL