9 spanning-tree guard root

spanning-tree guard root

 

Enables the guard root to restrict which interface is allowed to be the spanning-tree root port or the

 

path-to-the root for the switch.

Synopsis

spanning-tree guard root

 

no spanning-tree guard root

Operands

none

Defaults

Guard root is disabled.

Command

Interface configuration mode

Modes

 

Description

Use this command to enable the guard root on the interface. Use the no spanning-tree guard root

 

command to disable guard root on the selected interface.

Usage

The root port provides the best path from the switch to the root switch.

Guidelines

 

Note

Guard root protects the root bridge from malicious attacks and unintentional misconfigurations

 

where a bridge device that is not intended to be the root bridge becomes the root bridge. This

 

causes severe bottlenecks in the datapath. Guard root ensures that the port on which it is enabled

 

is a designated port. If the guard root enabled port receives a superior Bridge Protocol Data Unit

 

(BPDU), it goes to a discarding state.

Examples

To enable guard root:

 

switch(conf-if-te-0/1)#spanning-tree guard root

See Also

spanning-tree cost

154

Converged Enhanced Ethernet Command Reference

 

53-1001762-01

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Brocade Communications Systems 53-1001762-01 manual Spanning-tree guard root, Path-to-the root for the switch
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53-1001762-01 specifications

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