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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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Configuring Traffic Suppression for ICMP Packets

Configuring Traffic Suppression for ICMP Packets


Malicious users may flood a network with ICMP packets to initiate an attack. Processing large numbers of ICMP packets will consume many CPU resources and cause service abnormalities. To resolve this problem, configure ICMP packet suppression.

After ICMP packet suppression is configured on an interface, the system automatically discards ICMP packets when the number of ICMP packets sent by an interface to the CPU every second exceeds the rate threshold.

Before configuring ICMP packet suppression on an interface, run the undo icmp-reply fast command to disable the ICMP reply fast function.

Pre-configuration Tasks

Before configuring traffic suppression for ICMP packets, configure link layer protocol parameters for interfaces to ensure that the link layer protocol status on the interfaces is Up.


  1. Run system-view

    The system view is displayed.

  2. Run icmp rate-limit enable

    Traffic suppression for ICMP packets is enabled.

    By default, the traffic suppression function for ICMP packets is disabled.

  3. Run icmp rate-limit { total | interface interface-type interface-number [ to interface-number ] } threshold threshold-value

    The rate threshold for ICMP packets in the interface and system views is configured.

    By default, the rate limits of ICMP packets in the system and on an interface depend on the product model. The value is 128 on the S6720EI, S6720S-EI, S5720HI, and S5720EI, and 190 on the other models, in pps.

Updated: 2019-09-23

Document ID: EDOC1000178177

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