In which situation can an S series switch send the option field in Request messages to a client

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For S series switches excluding the S1700, the DHCP server returns the corresponding option field to a client only when the corresponding option field is encapsulated in the Request message.

Other related questions:
Which versions of S series switch functioning as DHCP server can return requested options to clients
When an S series switches (except S1700 switches) functions as a DHCP server, it encapsulates an option field in the Reply message sent to a client only when: 1) The Request message sent by the client requests the option; 2) The option is configured in the address pool on the server.

Functions of the GIADDR field of DHCP messages on S series switches
Functions of the GIADDR field of DHCP messages on S series switches: he GIADDR field (gateway IP address) in DHCP messages records the IP address of the first DHCP relay agent that DHCP messages pass through. After a client sends a DHCP Request message, the first DHCP relay agent fills its own IP address in this field when forwarding this DHCP Request message to the DHCP server if the server and the client are located on different network segments. The DHCP server uses the field to determine the network segment on which a client resides so that the server can assign an IP address on this network segment to the client.

Do S series switches support DHCP Option60
Only the S series switch excluding the S1700 used as the client supports the Option60 field in the DHCP Request messages.

Why Are Fields IP, code, request, response and message of Some Traces Displayed on the View Trace Page Null?

The fields IP, code, request, response and message are optional.

  • IP: If SystemAction is selected for Trace Type, the operation is triggered by the system. It is normal that the content of the IP field is left blank.
  • request, response, and code: The three fields indicate the request body and code sent and received by the API of a trace when sending an HTTP request. The content of the fields depends on the cloud service triggering the trace, and it is normal to be left blank.
  • message: This field is used for each cloud service to record the remarks. Its content depends on the cloud service triggering the trace, and it is normal to be left blank.

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