[All About Switches] Q&A: How Do I Enable TC Protection?

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A:

To enable TC protection, perform the following steps:

Step 1: Run the system-view command to enter the system view.

Step 2: Run the stp tc-protection interval interval-value command to set the time taken by the switch to process the maximum number of TC BPDUs.

Step 3: Run the stp tc-protection threshold threshold command to set the number of times that the switch processes received TC BPDUs and updates forwarding entries within a unit time.

For example, if the time period is set to 10 seconds and the maximum of TC BPDUs is set to 5, the switch processes only the first five TC BPDUs within 10 seconds and processes the subsequent TC BPDUs together after the time expires.

 

If attackers forge TC BPDUs to attack the switch, the switch receives a large number of TC BPDUs within a short period. If MAC address entries and ARP entries are deleted frequently, the switch is heavily burdened, causing potential risks to the network.

TC protection is used to suppress TC BPDUs. The number of TC BPDUs processed by a switch within a given period is configurable. If the number of TC BPDUs received by a switch exceeds the specified threshold within a given period, the switch processes only the specified number of TC BPDUs. After the specified time period expires, the switch processes all the excess TC BPDUs together. This function prevents the switch from frequently deleting MAC entries and ARP entries, protecting the switch from being overburdened.

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