3Com SuperStack 4 Configuration Manual page 243

Display and Debug RSTP
Table 282 Configure the Switch Security Function
Operation
Configure Switch BPDU protection (from System View)
Restore the disabled BPDU protection state, as defaulted,
(from System View).
Configure Switch Root protection (from Ethernet Port
View)
Restore the disabled Root protection state, as defaulted,
(from Ethernet Port View)
Configure Switch loop protection function (from Ethernet
Port View)
Restore the disabled loop protection state, as defaulted
(from Ethernet Port View)
After being configured with BPDU protection, the Switch will disable the edge
port through RSTP, which receives a BPDU, and notify the network manager at the
same time. Only the network manager can resume these ports.
The port configured with Root protection only plays a role of a designated port.
Whenever such a port receives a higher-priority BPDU when it is about to turn into
a non-designated port, it will be set to a listening state and not forward packets
any more (as if the link to the port is disconnected). If the port has not received
any higher-priority BPDU for a certain period of time thereafter, it will resume to
the normal state.
When you configure a port, only one configuration at a time can be effective
among loop protection, root protection, and edge port configuration.
By default, the Switch does not enable loop protection, BPDU protection or Root
protection.
For detailed information about the configuration commands, refer to the
Command Manual.
After the above configuration, execute
the running of the RSTP configuration, and to verify the effect of the
configuration. Execute
module. Execute
debugging
Table 283 Display and Debug RSTP
Operation
Display RSTP configuration information about
the local Switch and the specified ports
Display the list of STP-Ignored VLANs
Clear RSTP statistics information
Enable RSTP (error/event/packet) debugging
Disable RSTP debugging
display
command in User View to clear the statistics of RSTP
reset
command in User View to debug the RSTP module.
Command
display stp [ interface
interface_list
display stp ignored-vlan
reset stp [ interface
interface_list
debugging stp { error | event |
packet }
undo debugging stp { error |
event | packet }
RSTP Configuration
Command
stp bpdu-protection
undo stp bpdu-protection
stp root-protection
undo stp root-protection
stp loop-protection
undo stp loop-protection
command in all views to display
]
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