Huawei uses DHCP Option 148 for IPv4-based plug-and-play or zero-touch deployment of devices to iMaster NCE-Campus. The DHCP server can include controller information in this vendor-specific option, allowing a switch, router, or cloud-managed AP to obtain the southbound address or URL of iMaster NCE-Campus together with the required management port. After the device receives normal addressing information and the Option 148 parameters, it can reach the controller and establish the management channel, including NETCONF-based management in supported deployment scenarios. Huawei documentation distinguishes this from IPv6 deployment, where Option 17 can be used for equivalent controller discovery. The Option 148 value commonly carries fields such as the controller management mode, domain or IP address, and management port. This removes the need to manually enter controller information on every new device and is widely used in iMaster NCE-Campus onboarding workflows. Therefore, the numeric value required in the blank is 148, matching the source answer and Huawei campus deployment documentation.