Allied Telesis AT-9000 Series - Manual (Page 703)

AT-9000 Switch Command Line User’s Guide
675
SPANNING-TREE GUARD ROOT
Syntax
spanning-tree guard root
Parameters
None
Mode
Port Interface mode
Description
Use this command to enable the Root Guard feature on the specified port.
The Root Guard feature ensures that the port on which it is enabled is a
designated port. If a Root-Guard-enabled port receives a superior BPDU,
that may cause it to become a root port, then the port traffic is placed in a
“root inconsistent” state. For MSTP, this state is a discarding state.
Use the no version of this command, NO SPANNING-TREE GUARD
ROOT, to disable the Root Guard feature on the specified port.
To view the current setting for this parameter, refer to “SHOW
SPANNING-TREE” on page 669.
Confirmation Command
“SHOW SPANNING-TREE” on page 669
Examples
This example enables the Root Guard feature on port 7:
awplus> enable
awplus# configure terminal
awplus(config)# interface port1.0.7
awplus(config-if)# spanning-tree guard root
This example disables the Root Guard feature on port 12:
awplus> enable
awplus# configure terminal
awplus(config)# interface port1.0.12
awplus(config-if)# no spanning-tree guard root