Configuring Bpdu Guard - H3C S12500X-AF Series Configuration Manual

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TC-BPDU transmission restriction
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TC-BPDU guard
•
BPDU drop
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PVST BPDU guard

Configuring BPDU guard

For access layer devices, the access ports can directly connect to the user terminals (such as PCs)
or file servers. The access ports are configured as edge ports to allow rapid transition. When these
ports receive configuration BPDUs, the system automatically sets the ports as non-edge ports and
starts a new spanning tree calculation process. This causes a change of network topology. Under
normal conditions, these ports should not receive configuration BPDUs. However, if someone uses
configuration BPDUs maliciously to attack the devices, the network will become unstable.
The spanning tree protocol provides the BPDU guard feature to protect the system against such
attacks. When edge ports receive configuration BPDUs on a device with BPDU guard enabled, the
device performs the following operations:
•
Shuts down these ports.
•
Notifies the NMS that these ports have been shut down by the spanning tree protocol.
The device reactivates the shutdown ports after a detection interval. For more information about this
detection interval, see Fundamentals Configuration Guide.
You can configure the BPDU guard feature globally or on a per-edge port basis.
BPDU guard does not take effect on loopback-testing-enabled ports. For more information about
loopback testing, see Interface Configuration Guide.
Enabling BPDU guard globally
The global BPDU guard setting takes effect on all edge ports that are not configured by using the stp
port bpdu-protection command.
To enable BPDU guard globally:
Step
Enter system view.
1.
Enable BPDU guard globally.
2.
Configuring BPDU guard on an interface
An edge port preferentially uses the port-specific BPDU guard setting. If the port-specific BPDU
guard setting is not available, the edge port uses the global BPDU guard setting.
To configure BPDU guard on an interface:
Step
Enter system view.
1.
Enter
2.
interface
aggregate interface view.
Configure BPDU guard.
3.
Command
system-view
stp bpdu-protection
Command
system-view
Layer 2 Ethernet
interface
or Layer 2
interface-number
stp
{ enable | disable }
interface-type
port bpdu-protection
119
Remarks
N/A
By default, BPDU guard is globally
disabled.
Remarks
N/A
The specified interface
connect to a user terminal rather
than other device or shared LAN
segment.
By default, BPDU guard is not
configured on a per-edge port
basis. The status of BPDU guard on
an interface is the same as the
must