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Configuration Guide - Security

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

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, separating the management plane from the service plane, security risks.
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(Optional) Configuring the Device to Clear the MAC Address Entry Immediately When the User Is Disconnected

(Optional) Configuring the Device to Clear the MAC Address Entry Immediately When the User Is Disconnected

Context

If a DHCP client is disconnected but its MAC address entry is not aged, the device forwards the message whose destination address is the IP address of the DHCP client based on the dynamic MAC address entries. This deteriorates device performance.

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. You can enable the device to delete the mapping MAC address entry when a dynamic DHCP snooping binding entry is deleted.

Procedure

  1. Run system-view

    The system view is displayed.

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

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

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

  3. Run commit

    The configuration is committed.

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Updated: 2019-04-20

Document ID: EDOC1100074765

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