Help Center/ Anti-DDoS Service/ FAQs/ CNAD Advanced FAQs/ Function Consulting/ What Should I Do If the Protection Capability of CNAD Deteriorates After the Service Bandwidth Exceeds the Threshold?

Updated on 2025-08-20 GMT+08:00

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What Should I Do If the Protection Capability of CNAD Deteriorates After the Service Bandwidth Exceeds the Threshold?

The timing for crossing the service bandwidth threshold of CNAD is as follows:

When the average service bandwidth per minute of all IP addresses in the protection package is greater than the purchased service bandwidth plus the purchased elastic service bandwidth, the system starts to record the threshold-crossing duration.

If the service bandwidth exceeds the threshold for 36 hours, the protection capability deteriorates. For details, see Table 1.

**Table 1** Service bandwidth exceeding the threshold
Type	CNAD 1.0		CNAD 2.0
Edition	Unlimited Protection Basic Edition	Unlimited Protection Advanced Edition	Enterprise edition	SME edition
Description	If the service bandwidth exceeds the limit, the protection capability drops and ranges from 10 Gbit/s to 20 Gbit/s.	If the service bandwidth exceeds the limit, the protection capability drops and ranges from 10 Gbit/s to 20 Gbit/s.	Chinese mainland: If the service bandwidth exceeds the limit, the protection capability drops and ranges from 10 Gbit/s to 20 Gbit/s. Outside the Chinese mainland: If the service bandwidth exceeds the limit, the protection capability drops to 5 Gbit/s.	Chinese mainland: If the service bandwidth exceeds the limit, the protection capability drops and ranges from 10 Gbit/s to 20 Gbit/s.

You can use the following methods to restore the protection capability:

Wait until next month for the protection capability to automatically recover.
Upgrade the service bandwidth of the instance. For details, see Modifying Specifications of an Instance.
Enable elastic service bandwidth. For details, see Modifying Specifications of an Instance.

Parent topic: Function Consulting

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