How to solve the problem that invalid IP addresses cannot be automatically cleared on S series switches

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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.

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.

Invalid IP addresses allocated through DHCP cannot be automatically deleted
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.

DHCP clients cannot obtain IP addresses. How do I solve this problem
Ensure that the DHCP configuration is correct, and reduce the IP address lease. If a long IP address lease is set, after all addresses in the address pool are allocated, addresses that are not required cannot be released immediately. As a result, other DHCP clients cannot obtain IP addresses.

IP addresses become invalid on S series switches in V100R002C00
It is recommended that you upgrade V100R002C00 to V100R002C00SPC200 and install the latest patch V100R002SPH021, or upgrade V100R002C00 to V100R006C00SPC800.

Checking the restart reasons of an S series switch
the display reboot-info command to check restart reasons of S series switches (except S1700 switches). A switch may be restarted due to one of the following reasons: MANUAL: It is restarted by using the reboot command. POWER: It is restarted after being powered off. SCHEDU: It is restarted by using the schedule reboot command. OTHER: It is restarted due to either of the following reasons: 1. It is power recycled instantly, for example, the power cable is in bad contact or transient overvoltage and loss of voltage occurs. In this case, check whether the power cable is correctly connected to the switch. 2. An exception occurs in the system.

If SCHEDU or MANUAL is displayed in the command output, the switch is normally restarted. If POWER or OTHER is displayed, check whether any other devices using the same power supply system have reboot records around the time when the switch is restarted. If such reboot records are found, the switch's restart is caused by exceptions in the external power supply system. If no such reboot record is found, go to the next step . If the switch uses pluggable power modules, replace the power modules with power modules that can work normally to determine whether the power modules are faulty. If the switch uses built-in power modules, collect required information and contact Huawei technical support personnel if the external power supply system works properly. The information includes the outputs of the display version, display device, display reboot-info, display alarm urgent, and display power commands. (If pluggable power modules are used, the output of the display power command is not required.)


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