Do S series switches support the DHCP server polling function on a DHCP relay agent

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When functioning as a DHCP relay agent, the S series switch excluding the S1700 supports the DHCP server polling function on a DHCP relay agent starting from V100R006C00. By default, the DHCP server polling function on a DHCP relay agent is disabled. You can enable the DHCP server polling function on a DHCP relay agent by configuring ip relay address cycle in the system view.

Other related questions:
Does DHCP relay on S series switch support polling
When functioning as a DHCP relay agent, an S series switch (except S1700 switches) supports the DHCP server polling function since V100R006C00. By default, the DHCP server polling function is disabled. You can enable the DHCP server polling function by running the ip relay address cycle command in the system view.

Does the S series switch used as the DHCP relay agent support QinQ
On an S series switch excluding the S1700, the DHCP relay function can be configured on QinQ termination sub-interfaces.

High CPU usage when S series switch functions as a DHCP relay agent
When an S series switch functions as a DHCP relay agent, multiple VLANs need to be configured on the switch so that the switch can forward DHCP Request messages of clients on multiple network segments. When the switch receives a DHCP Request message from a client, it traverses all VLANs to find the VLAN ID and determine the gateway address of the client. Too large a VLAN ID uses excessive CPU resources, resulting in a high CPU usage. In actual networking, do not allocate IP addresses on many IP network segments to clients when a switch is used as a DHCP relay agent, and fewer VLAN IDs should be used. To assign IP addresses to a large number of clients, configure multiple DHCP relay agents.

Can the device support the DHCP relay agent and DHCP server in the super VLAN
In V100R005 and later versions, the device supports the DHCP relay agent and DHCP server on the VLANIF interface corresponding to the super VLAN.

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