Clear conflicting addresses in the address pool on a device functioning as a DHCP server. The conflicting addresses then can be used. For example, clear the conflicting IP addresses in the global address pool pool1 or interface address pool VLANIF100.

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Configuration in the global address pool:
<HUAWEI> reset ip pool name pool1 conflict
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Configuration in the interface address pool:
<HUAWEI> reset ip pool interface vlanif100 conflict
More Information: S Series Switches Common Operation Guide