How do I block a Designated Port. on an S series switch?

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You can perform the following operations to block a Designated Port on an S (except the S1700) series switch:
1. Run the stp priority command to set the priority of a switch.
2. Run the stp cost command to set the path cost of a port.
3. Run the stp port priority command to set the priority of the port.

Other related questions:
Whether the S-series switches block the protocol port
Whether the S-series switches block the protocol port

How to change observing ports on S series switches
For S series switches (except S1700 switches), the method for changing observing ports that are bound during mirroring configuration varies depending on the switch model and version. - For S series modular and fixed switches (S5700EI/S5710EI/S5720EI/S5700HI/S5710HI/S5720HI/S6700EI running a version from V200R005 to V200R007, and fixed switches running a version later than V200R008): Find the index for an observing port, and change these port. Assume that the mirrored port is GE1/0/1, observing port GE2/0/1 is bound to the mirrored port, and the index for the observing port is 1. To change the observing port to GE2/0/2, run the observe-port 1 interface gigabitethernet 2/0/2 command in the system view. - For S series fixed switches (switches running a version earlier than V200R005, and the S1720GFR/S2720/S2750/S5700LI/S5700S-LI/S5700-C-LI/S5700SI running a version from V200R005 to V200R007): You cannot directly change an observing port, but need to perform the following steps. (The following uses local port mirroring as an example.) Assume that the mirrored port is GE0/0/1, observing port GE0/0/2 is bound to the mirrored port, and the index for the observing port is 1. To change the observing port to GE0/0/3, perform the following steps: 1. In the view of the mirrored port, delete the binding between the observing port and mirrored port. [HUAWEI] interface gigabitethernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] undo port-mirroring to observe-port 1 inbound [HUAWEI-GigabitEthernet0/0/1] quit 2. Delete observing port GE0/0/2. This step is optional. Skip this step if you want to reserve the observing port. If this observing port does not need to be bound to any other mirrored port, you are advised to delete it, so that the related index resource and physical port resource can be released. [HUAWEI] undo observe-port 1 3. Create a new observing port and bind it to the mirrored port. [HUAWEI] observe-port 1 interface gigabitethernet 0/0/3 [HUAWEI] interface gigabitethernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] port-mirroring to observe-port 1 inbound [HUAWEI-GigabitEthernet0/0/1] quit

Will ports be blocked when two S series switches are connected using two Ethernet cables
If STP is enabled globally and on the ports of two S (except the S1700) series switches, one of the two connected ports of the two switches will be blocked.

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