Can ports on CSS subcards be used as service ports

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Ports on CSS subcards can only be used to provide cluster services and cannot be used as service ports.

Other related questions:
Functions of ports on CSS subcards
CSS subcards provide 10GBASE-X SFP+ optical ports for sending and receiving service packets as well as providing CSS services. You can refer to the following documents for the detailed CSS connection rules: For the hardware description of the S9300 and S9300E, see S9300&S9300E Hardware Description. For the hardware description of the S7700, see S7700 Hardware Description. For the hardware description of the S9700, see S9700 Hardware Description. For the hardware description of the S12700, see S12700 Hardware Description.

If two service ports on an S series fixed switch are configured as stack ports, can other service ports on the switch that are not configured as stack ports be used to run services
For most S series fixed switches, the ports that are not configured as stack port can still run services. For example, when two rear SFP ports on an S5700-52P-LI switch are configured as stack ports, the other two rear SFP ports can forward service data. However, on the S6700EI and S6720EI, every four ports are added to one group. A group of ports must function as stack ports or service ports together. That is, when one port is configured as a stack port, the other three ports in the same group will automatically be configured as stack ports but cannot function as service ports.

How to restore a CSS port to a service port for the CSS composed of S series modular switches
Perform either of the following operations: 1. In non-CSS scenarios, to restore a physical member port to a service port on a standalone switch, run the undo interface css-port command in the system view. 2. In CSS scenarios, to restore a physical member port to a service port in a CSS, run the shutdown interface ** command in the logical CSS port view (run the interface css-port port-id command to enter the view) to shut down the physical member port and then run the undo port interface ** enable command.

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