3com MSR 20-20 참조 매뉴얼

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stp root-protection
Syntax
stp root-protection
undo stp root-protection
View
Ethernet interface view, port group view
Parameters
None
Description
Use the stp root-protection command to enable the root guard function for a 
port or a group of ports.
Use the undo stp root-protection command to restore default setting of the 
root guard function for the port(s).
By default, the root guard function is disabled.
Note that, configured in Ethernet interface view, the setting is effective on the 
current port only; configured in port group view, the setting is effective on all the 
ports in the port group.
Examples
# Enable the root guard function for port Ethernet 1/1.
<Sysname> system-view
[Sysname] interface Ethernet 1/1
[Sysname-Ethernet1/1] stp root-protection 
stp tc-protection
Syntax
stp tc-protection enable
stp tc-protection disable
View
System view
Parameters
None
Description
Use the stp tc-protection enable command to enable the TC-BPDU attack 
guard function for the device.
Use the stp tc-protection disable command to disable the TC-BPDU attack 
guard function for the device.
By default, the TC-BPDU attack guard function is enabled.
Examples
# Enable the TC-BPDU attack guard function for the device.
<Sysname> system-view
[Sysname] stp tc-protection enable