DHCP user access restriction is used to restrict the connection requests of DHCP users. By default, DHCP user access restriction is disabled. If a large number of invalid connection request packets exist on a network, you can run the undo dhcp user chasten disable command to enable it. In normal cases, you are advised to enable DHCP user access restriction.
Example
# Disable DHCP user access restriction.
<HUAWEI> system-view
[~HUAWEI] dhcp user chasten disable