When an S series switch functions as a DHCP server, what are precautions for configuring Option3 in the response message sent by the DHCP server

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In V100R003, V100R006, V200R001, and later versions, when an S series switch (excluding the S1700) serves as the DHCP server, if a client is not connected to the server through a relay agent, the content in Option3 of the response message sent by the server is the address of the VLANIF interface on the switch. However, the content in Option3 should be another address in some scenarios. Configure Option3 based on the following rules:
1. Configure the global address pool mode.
2. Set gateway-list ip-address to be the configured address in the address pool view. This address must be located on the same network segment as the address of the DHCP server.

Other related questions:
Method to configure DHCP on different network segments on S series switches
S series switches excluding the S1700 support DHCP configuration on the same network segment or different network segments. A DHCP relay agent is required to forward DHCP messages when the DHCP server and DHCP client are located on different network segments or in different VLANs.

Method to configure DHCP server on S series switches
For S series switches excluding the S1700, the switch can function as the DHCP server to assign IP addresses to DHCP clients. Two configuration modes are available: - Interface address pool: This mode is simple. It only applies to scenario where the DHCP server and DHCP client are located on the same network segment, that is, there is no need to deploy the DHCP relay agent. - Global address pool: It applies to the scenario where the DHCP server and DHCP client are located on different segments, that is, the DHCP relay agent needs to be deployed. It also applies to the scenario where the DHCP server and DHCP client are located on the same network segment and IP addresses to be assigned to clients on multiple interfaces.

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