Display Stp - 3Com 5500G-EI Command Reference Manual

326 C 10: U RSTP C
HAPTER SING OMMANDS
for the device and ports. This command enables/disables RSTP on a device in
system view and enables/disables RSTP on a port in Ethernet Port View.
Related command: .
stp mode
Example
To enable RSTP on a Switch, enter the following:
<SW5500>system-view
System View: return to User View with Ctrl+Z.
[SW5500]stp enable
To disable RSTP on GigabitEthernet1/0/1, enter the following:
[SW5500]interface GigabitEthernet1/0/1
[SW5500-GigabitEthernet1/0/1]stp disable
stp bpdu-protection Syntax
stp bpdu-protection
undo stp bpdu-protection
View
System view
Parameter
None
Description
Use the command to enable BPDU protection on a Switch.
stp bpdu-protection
Use the command to resume the default status of
undo stp bpdu-protection
BPDU protection function.
By default, BPDU protection is not enabled.
For an access layer device, its ports are generally directly connected to a user
terminal (such as a PC) or file server, and configured as an edge port to implement
fast transition. When such a port receives BPDU packets, the system will set it to a
non-edge port and recalculate the spanning tree, which will cause network
topology flapping. In normal circumstances, these ports should not receive any
BPDU packets. However, someone may forge BPDU to maliciously attack the
Switch and cause network flapping.
RSTP provides the BPDU protection function against such an attack. After the
BPDU protection function is enabled on a Switch, the system will disable an edge
port that has received BPDUs and notify the network manager about it. The
disabled port can only be re-enabled by the network manager.
Example
To enable BPDU protection function on a Switch, enter the following:
<SW5500>system-view
System View: return to User View with Ctrl+Z.