H3C Technologies H3C SecPath F1000-E - Manual (Page 213)

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Item Description
TC Protection
Whether to enable the TC guard function, that is, protection against
topology change (TC) BPDUs.
When receiving TC BPDUs (the BPDUs used to notify topology
changes), the device flushes its forwarding address entries. If someone
forges TC-BPDUs to attack the device, the device will receive a larger
number of TC-BPDUs within a short time and be busy with forwarding
address entry flushing. This affects network stability. With TC guard
enabled, you can prevent frequent flushing of forwarding address
entries.
IMPORTANT:
H3C recommends that you keep this function enabled.
TC Protection Threshold
Set the maximum number of forwarding address entry flushes that the
device can perform within a specific time period after it receives the first
TC-BPDU.
Return to
MSTP configuration task list .
Configuring MSTP on a Port
Select Network > MSTP > Port from the navigation tree to enter the page displaying the MSTP
information of ports, as shown in
Figure 9 .
Figure 9 MSTP configuration of a port
Click the icon corresponding to a port to enter the MSTP Port Configuration page of the port, as
shown in Figure 10 .