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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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Defense Against DHCP Flood Attacks

Defense Against DHCP Flood Attacks


On a DHCP network, if a large number of DHCP messages are sent to the device within a short period of time, device performance may deteriorate, preventing the device from working properly. This kind of attack is known as a DHCP flood attack.


To prevent DHCP flood attacks, enable DHCP snooping and enable the device to check the rate at which DHCP messages are sent to the processing unit. The device then limits the rate at which it sends DHCP messages to the processing unit and discards those that exceed the rate.

Updated: 2019-04-01

Document ID: EDOC1000178319

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