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network topology jitter. Normally these ports do not receive BPDUs, but if a user maliciously

attack the switch by sending BPDUs, network topology jitter occurs.

To prevent this attack, MSTP provides BPDU protect function. With this function enabled on the

switch, the switch shuts down the edge ports that receive BPDUs and reports these cases to

the administrator. If a port is shut down, only the administrator can restore it.



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

Port Select: Click the Select button to quick-

select the corresponding port

based on the port number you entered.

Select:

Select the desired port for port protect configuration. It is