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BPDU Filter
BPDU filter function is to prevent BPDUs flood in the STP network. If a switch receives
malicious BPDUs, it forwards these BPDUs to the other switched in the network, which may
result in spanning trees being continuously regenerated. In this case, the switch occupying too
much CPU or the protocol status of BPDUs is wrong.
With BPDU filter function enabled, a port does not receive or forward BPDUs, but it sends out
its own BPDUs. Such a mechanism prevents the switch from being attacked by BPDUs so as to
guarantee generation the spanning trees correct.
Choose the menu Spanning Tree→STP Security→Port Protect to load the following page.
Figure 7-10 Port Protect
The following entries are displayed on this screen:
Port Protect
UNIT:1/LAGS: Click 1 to configure the physical ports. Click LAGS to configure the
link aggregation groups.
Select:
Select the desired port for port protect configuration. It is
multi-optional.
Port:
Displays the port number of the switch.
Loop Protect: Loop Protect is to prevent the loops in the network brought by
recalculating STP because of link failures and network
congestions.
Root Protect: Root Protect is to prevent wrong network topology change caused
by the role change of the current legal root bridge.
TC Protect: TC Protect is to prevent the de
crease of the performance and
stability of the switch brought by continuously removing MAC
address entries upon receiving TC-BPDUs in the STP network.
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