Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 353)

Multi-Service IronWare Switching Configuration Guide 323
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IEEE 802.1D Spanning Tree Protocol (STP)
12
Enabling Root Guard
Root Guard is configured on a per interfaces basis. To enable Root Guard, enter a command such
as the following.
Brocade(config)# interface ethernet 5/5
Brocade(config-if-e10000-5/5) spanning-tree root-protect
Syntax: [no] spanning-tree root-protect
Enter the no form of the command to disable Root Guard on the port.
Setting the Root Guard timeout period
To configure the Root Guard timeout period globally, enter a command such as the following.
Brocade(config)# spanning-tree root-protect timeout 120
Syntax: [no] spanning-tree root-protect timeout timeout in seconds
The timeout in seconds parameter allows you to set the timeout period. The timeout period may be
configured to anything between 5 and 600 seconds. Default is 30 seconds.
Checking if Root Guard is configured
To determine if Root Guard is configured, enter the following command.
Brocade#show interface ethernet 1/4
10GigabitEthernet1/4 is up, line protocol is up
STP Root Guard is enabled, STP BPDU Guard is disabled
Syntax: show interface ethernet slot/port
Displaying the Root Guard state
To display the Root Guard state, enter the show spanning-tree root-protect command.
Brocade#show spanning-tree root-protect
Port VLAN Current State
13/6 3 Consistent state
13/9 2 Inconsistent state (29 seconds left on timer)
Syntax: show spanning-tree root-protect
Reconfiguring the timeout period
The timeout period timer is activated whenever a port encounters a superior BPDU, which then
results in a Root Guard violation. If the timeout period is reconfigured while a timer is in use, the
timer on that port is set to the new timeout period, minus the time elapsed since the superior BPDU
was received.