# Enabling the Second-Level Blackhole

Real-time statistics about traffic destined to a specified IP address is collected for comparison with the threshold every second. When the traffic of a specified IP address exceeds the blackhole threshold, the corresponding blackhole action is triggered.

#### Procedure

1. Configure the notification mode of second-level blackhole event.
2. Set the blackhole mode of the Zone.
3. Enable the second-level blackhole.
   1. Choose Defense > Policy Settings > Zone.
   2. Click of the Zone.
   3. In the Defense Policy dialog box, configure a blackhole policy. Table 1 lists related parameters.

      Table 1 Blackhole parameter configuration
      Parameter | Description
      --- | ---
      Second-Level Blackhole | Select Enabled.
      Threshold (Mbit/s) | Set the blackhole threshold. When the traffic exceeds the value of Threshold, enable the corresponding blackhole type for defense.
      Type | Set the blackhole type to Routing blackhole.

   4. Click OK.

Parent topic: Dynamic Blackhole Policy

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