Configuring Protection Functions; Enabling Bpdu Guard; Enabling Root Guard - HP 6125XLG Configuration Manual

Configuring protection functions

A spanning tree device supports the following protection functions:
• BPDU guard
Root guard
•
Loop guard
•
Port role restriction
•
TC-BPDU transmission restriction
•
• TC-BPDU guard
BPDU drop
•

Enabling 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 forges configuration BPDUs
maliciously to attack the devices, the network will become unstable.
The spanning tree protocol provides the BPDU guard function 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 actions:
Shuts down these ports.
•
Notifies the NMS that these ports have been shut down by the spanning tree protocol.
•
The device reactivates the closed ports after a detection interval. For more information about this
detection interval, see Fundamentals Configuration Guide.
BPDU guard does not take effect on loopback-testing-enabled ports. For more information about
loopback testing, see
Configure BPDU guard on a device with edge ports configured.
To enable BPDU guard:
Step
1. Enter system view.
2. Enable the BPDU guard
function for the device.

Enabling root guard

The root bridge and secondary root bridge of a spanning tree should be located in the same MST region.
Especially for the CIST, the root bridge and secondary root bridge are put in a high-bandwidth core
region during network design. However, due to possible configuration errors or malicious attacks in the
network, the legal root bridge might receive a configuration BPDU with a higher priority. Another device
"Configuring Ethernet
Command
system-view
stp bpdu-protection
interfaces."
113
Remarks
N/A
By default, BPDU guard is
disabled.