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Configuration Guide - Security

S7700 and S9700 V200R011C10

This document describes the configurations of Security, including ACL, reflective ACL, local attack defense, MFF, attack defense, traffic suppression and storm control, ARP security, port security, DHCP snooping, ND snooping, PPPoE+, IPSG, SAVI, URPF, keychain, separating the management plane from the service plane, security risks.
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Attack Source Tracing Does Not Take Effect

Attack Source Tracing Does Not Take Effect

Fault Description

Attack source tracing does not take effect after attack source tracing is configured.

Common Causes

Possible causes are as follows:
  • The attack defense policy is not applied to the correct LPU or MPU.
  • The checking threshold for attack source tracing is large.


  1. Determine the attacked target.
    1. Run the display interface [ interface-type ] counters { inbound | outbound } command to check statistics on packets received and sent on interfaces of the device to determine the LPU to be attacked.
    2. Run the display cpu-usage command to check CPU usage of the MPU to check whether the MPU has been attacked.
    3. If the LPU or MPU has been attacked, go to the next step.
  2. Determine whether the attack defense policy configured with attack source tracing is applied to the attacked LPU or main control board.
    1. Run the display this command in the system view to check whether the cpu-defend-policy command has been configured.
    2. Or run the display auto-defend configuration command to check the name of the attack defense policy and the LPU to which the policy is applied.
    3. If the policy is not configured, run the cpu-defend-policy command in the system view or the slot view to configure the policy. If the policy is configured, go to the next step.
  3. Check whether the checking threshold for attack source tracing is large.

    Run the display auto-defend configuration command to check the value in the auto-defend threshold field. If the value is large, run the auto-defend threshold command in the attack defense policy view to reduce the value.

Updated: 2019-10-18

Document ID: EDOC1000178319

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