After DAD in direct mode is configured on an interface, the interface is blocked. Whether the blocked interface supports DAD

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The blocked port still supports DAD.
After DAD in direct mode is configured on a port, the port is blocked and processes only BPDU packets without forwarding common service packets. Because standard BPDUs are used for DAD, the DAD function is not affected when the port is blocked.

Other related questions:
Blocking a specified interface on a WLAN device using STP
You can use one of the following methods to block a specified interface on a WLAN device: 1. Run the stp priority command to set the device priority. 2. Run the stp cost command to set the path cost of the interface. 3. Run the stp port priority command to set the interface priority.

Will the device management be affected if an interface with loop detected is blocked
The blocked interface does not affect device management because the ping and Telnet functions are not affected. Blocking the interface only affect Layer 2 forwarding on the interface because the blocked interface does not learn MAC addresses.

Must DAD be configured
DAD is optional. However, to detect a dual-master condition after a stack splits, it is recommended that DAD be configured after a stack is set up.

Can protocol packets be sent if an interface with a loop detected is blocked on an S series switches
Can protocol packets be sent if an interface with a loop detected is blocked on an S series (except the S1700) or E series switch? For S series switches (except the S1700), the destination MAC address of LDT packets and tagged LBDT packets is all Fs. These packets cannot be sent through an interface if it is blocked. The destination MAC address of untagged LBDT packets is a BPDU MAC address. These packets can still be sent through an interface even if it is blocked. For E series switches, the destination MAC address of tagged LBDT packets is all Fs. These packets cannot be sent through an interface if it is blocked. The destination MAC address of untagged LBDT packets is a BPDU MAC address. These packets can still be sent through an interface even if it is blocked.

Display STP configuration of an interface on the S1728GWR-4P switch
Display the STP configuration of an interface on an S1728GWR-4P switch as follows: 1. Choose Spanning Tree > STP. 2. Select Configure Interface from the Step drop-down list box. 3. Select Show Information from the Action drop-down list box. 4. The configured parameters (such as STP Status, Port Role, Designated Bridge, Oper Path Cost, and Oper Edge Port) are displayed.

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