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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) Configuring the Device to Clear the MAC Address Entry As Soon As a User Is Disconnected

(Optional) Configuring the Device to Clear the MAC Address Entry As Soon As a User Is Disconnected

Context

If a DHCP client is disconnected before the client's dynamic MAC address entry is aged out, the DHCP snooping-enabled device continues to forward messages destined for the disconnected DHCP client based on the MAC address entry. This causes the device performance to deteriorate.

The DHCP client sends a DHCP Release message when it is disconnected. Upon receiving the message, the device immediately deletes the DHCP snooping binding entry of the DHCP client. With this function enabled, the device also deletes the corresponding MAC address entry. In this way, the device no longer forwards packets to the disconnected DHCP client.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run dhcp snooping user-offline remove mac-address

    The device deletes the MAC address entry of a DHCP client when the dynamic binding entry is deleted.

    By default, a device does not delete the MAC address entry of a DHCP client when the dynamic binding entry is deleted.

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Updated: 2019-09-23

Document ID: EDOC1000178177

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