H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 179)

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Table 54 Protection types
Protection type Description
Edged Port
Set the port as an edge port.
Some ports of access layer devices are directly connected to PCs or file servers, which
cannot generate BPDUs. You can set these ports as edge ports to achieve fast transition for
these ports.
H3C recommends that you enable the BPDU guard function in conjunction with the edged
port function to avoid network topology changes when the edge ports receive
configuration BPDUs.
Root Protection
Enable the root guard function.
Configuration errors or attacks may result in configuration BPDUs with their priorities
higher than that of a root bridge, which causes a new root bridge to be elected and
network topology change to occur. The root guard function is used to address such a
problem.
Loop Protection
Enable the loop guard function.
By keeping receiving BPDUs from the upstream device, a device can maintain the state of
the root port and other blocked ports. These BPDUs may get lost because of network
congestion or unidirectional link failures. The device will re-elect a root port, and blocked
ports may transit to the forwarding state, causing loops in the network. The loop guard
function is used to address such a problem.
Displaying MSTP information of a port
1. Select Network > MSTP from the navigation tree.
2. Click the Port Summary tab.
3. Select a port (GigabitEthernet 1/0/16 for example) on the chassis front panel (If aggregate
interfaces are configured on the device, the page displays a list of aggregate interfaces below the
chassis front panel. You can select aggregate interfaces from this list). The lower part of the page
displays the MSTP information of the port in MSTI 0 (when STP is enabled globally) or the STP
status and statistics (when STP is not enabled globally), the MSTI to which the port belongs, and the
path cost and priority of the port in the MSTI, as shown in Figure 152 .