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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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Why Can't Users Obtain IP Addresses after DHCP Snooping Is Configured?

Why Can't Users Obtain IP Addresses after DHCP Snooping Is Configured?

After DHCP snooping is enabled, all the interfaces on the device are untrusted interfaces by default. In this case, you need to use dhcp snooping trusted command to set the status of the interfaces connected to the DHCP server to trusted. Otherwise, the DHCP Reply messages sent from the DHCP server are discarded and users connected to the device cannot obtain IP addresses from the DHCP server.

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Updated: 2019-04-01

Document ID: EDOC1000178319

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