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Configuration Guide - Security

S1720, S2700, S5700, and S6720 V200R011C10

This document describes the configurations of Security, including 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, MPAC, separating the management plane from the service plane, security risks, PKI.
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(Optional) Enabling Alarm Reporting for Packet Loss Caused by CPCAR Exceeding

(Optional) Enabling Alarm Reporting for Packet Loss Caused by CPCAR Exceeding


To protect the CPU, a switch limits the rate of protocol packets sent to the CPU based on the CPCAR. If the rate of protocol packets exceeds the CPCAR, excess protocol packets are dropped. As a result, the corresponding service may not run normally. To quickly detect packet loss caused by CPCAR exceeding, you can enable alarm reporting for this event. After this function is enabled, the switch checks for packet loss caused by CPCAR at 10-minute intervals. If the switch finds that the number of dropped packets of a protocol increases, the switch reports a packet loss alarm.


This function is only supported by S5720EI, S5720HI, S6720S-EI, or S6720EI.


  1. Run system-view

    The system view is displayed.

  2. Run cpu-defend trap drop-packet

    The system is enabled to report alarms for packet loss caused by CPCAR exceeding.

Updated: 2019-03-28

Document ID: EDOC1000178177

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