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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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Enabling the User-Level Rate Limiting

Enabling the User-Level Rate Limiting


User-side hosts are prone to virus attacks. Infected hosts may send a large number of protocol packets to network devices, causing a high CPU usage and degraded performance on the devices and affecting services. You can configure the user-level rate limiting to resolve this problem. User-level rate limiting identifies users by user MAC addresses and limits the rates of specified packets (ARP, ND, DHCP Request, DHCPv6 Request, IGMP, 802.1X, and HTTPS-SYN packets) for both wired and wireless users. By default, the threshold for each user MAC address is 10 pps.

The user-level rate limiting is more precise than CPCAR (based on device) and port attack defense (based on interface) because it is user-specific and has little impact on online users.


  1. Run system-view

    The system view is displayed.

  2. Run cpu-defend host-car enable

    The user-level rate limiting is enabled.

    By default, the user-level rate limiting is enabled.

Updated: 2019-09-23

Document ID: EDOC1000178177

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