Invalid IP addresses allocated through DHCP cannot be automatically deleted

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S series switches (except S1700 switches) allow you to configure the time to reclaim IP addresses as follows:
- In global address pool mode, run the dhcp server lease command in the IP address pool view.
- In interface address pool mode, run the lease command in the view of the interface.

Other related questions:
How to withdraw the invalid DHCP server IP address when it cannot be automatically cleared
To solve this problem, run the dhcp server lease command to set the IP address lease.

How to solve the problem that invalid IP addresses cannot be automatically cleared on S series switches
The time for reclaiming IP addresses on S series switches is configurable: - In global address pool mode, run the lease command in the IP address pool view. - In interface address pool mode, run the dhcp server lease command in the corresponding interface view.

Static DHCP binding on S series switch
In static DHCP binding mode, fixed IP addresses can be assigned to DHCP clients. Versions and models of S series switches except S1700 switches that support this function are as follows: - All switch models in V200R005 and later versions, except the S2720 in V200R006C10 - All switch models except the S5700LI, S5700S-LI, and S2750 in versions earlier than V200R005

An AP fails to obtain an IP address through DHCP
Perform the following steps to locate the fault: 1. Check whether the AP is configured to obtain an IP address through DHCP. 2. Check whether the Layer 2 link between the AP and DHCP server is working properly. 3. Run the display ip pool name ip-pool-name used command on the DHCP server to check whether the AP has obtained an IP address.

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