What are the restrictions when service ports are configured as CSS ports on S series modular switches

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The restrictions are as follows:
1. A card port can be added to only one logical CSS port.
2. On the EH1D2X08SED4 and EH1D2X08SED5 for the S9700, ES1D2X08SED4 and ES1D2X08SED5 for the S7700, and LE2D2X08SED4 and LE2D2X08SED5 for the S9300, at most four ports can be configured as CSS physical member ports. The four physical member ports must be the first four ports (numbered 0 to 3) or the last four ports (numbered 4 to 7) on the LPUs.
3. On the EH1D2X16SFC0/EH1D2X40SFC0/EH1D2X32SSC0/EH1D2X16SSC2 for the S9700, ES1D2X16SFC0/ES1D2X40SFC0/ES1D2X32SSC0/ES1D2X16SSC2 for the S7700, and LE0DX16SFC00/LE0DX40SFC00/LE1D2X32SSC0/LE1D2X16SSC2 for the S9300, a group of four ports must be configured as CSS physical member ports together. For example, ports 0 to 3 or ports 4-7 must be configured together, but ports 2 to 5 cannot be configured together.

Other related questions:
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.

CSS cables supported when S series modular switches use service port clustering
For details about supported CSS cables and the maximum of transmission distance when S series modular switches use service port clustering, see the right page. For details about CSS cables on S series fixed switches

Whether the CSS ID of a port can be canceled after S series modular switches establish a CSS
After S series modular switches establish a CSS, interfaces are numbered in the format of CSS ID/slot ID/subcard ID/port. The CSS ID cannot be deleted or cancelled. To delete the CSS ID, you must disable the CSS function.

Are services affected after a CSS composed of S series modular switches splits
When a CSS splits, the two devices work independently, and inter-chassis services are interrupted. If MAD is configured, the physical interfaces of one device will be shut down, and services on the interfaces are interrupted.

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