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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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Setting the Aging Time for Port Attack Defense

Setting the Aging Time for Port Attack Defense


After a device with port attack defense function enabled detects an attack on a port, the device traces the source and limits the rate of the attack packets on the port within the aging time (T seconds). When the aging time expires, the device calculates the protocol packet rate on the port again. If the rate is still above the protocol rate threshold, the device keeps tracing the source and limits the rate of the attack packets; otherwise, the device stops tracing the source.

If the aging time is too short, the device frequently starts packet rate detection on ports, which consumes CPU resources. If the aging time is too long, protocol packets cannot be promptly processed by the CPU, which affects services. Therefore, balance between the service operation status and CPU usage when setting an aging time.


  1. Run system-view

    The system view is displayed.

  2. Run cpu-defend policy policy-name

    The attack defense policy view is displayed.

  3. Run auto-port-defend aging-time time

    The aging time for port attack defense is set.

    By default, the aging time for port attack defense is 300 seconds.

Updated: 2019-09-23

Document ID: EDOC1000178319

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