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CLI-based Configuration Guide - Security

AR500, AR510, AR531, AR550, AR1500, and AR2500 V200R010

This document provides the basic concepts, configuration procedures, and configuration examples in different application scenarios of the network management feature supported by the device.
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Clearing DHCP Snooping Binding Entries

Clearing DHCP Snooping Binding Entries

Context

After the networking environment changes, DHCP snooping binding entries do not age immediately. The following information in DHCP snooping binding entries may change, causing packet forwarding failure:
  • VLAN to which a DHCP client belongs.
  • Interface to which DHCP clients are connected.
Before changing the networking environment, clear all DHCP snooping binding entries manually so that the device generates a new DHCP snooping binding table based on the new networking environment.

After the DHCP snooping binding entries are cleared, network communication can be recovered only after all the DHCP users connected to the device re-log in and new binding entries are generated. Exercise caution when you run the command.

Procedure

  • Run the reset dhcp snooping user-bind [ [ vlan vlan-id | interface interface-type interface-number ] * | ip-address [ ip-address ] | ipv6-address [ ipv6-address ] ] command in the user view to clear DHCP snooping binding entries.

    NOTE:

    The AR530 series do not support the ipv6-address parameter.

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Updated: 2019-05-20

Document ID: EDOC1100034236

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