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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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Clearing DHCP Snooping Binding Entries

Clearing DHCP Snooping Binding Entries


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.


  • In the user view, run the following commands to clear DHCP snooping binding entries:

    • reset dhcp snooping user-bind [ vlan vlan-id | interface interface-type interface-number ] * [ ipv4 | ipv6 ]
    • reset dhcp snooping user-bind [ ip-address [ ip-address ] | ipv6-address [ ipv6-address ] | vpls vpls-name ]
    • reset dhcp snooping user-bind [ ipv6-prefix [ prefix/prefix-length ] ]

    The parameter vpls vpls-name is only supported by the S5720HI.

Updated: 2019-09-23

Document ID: EDOC1000178177

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