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

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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.

Other related questions:
Service ports on S series fixed switches that support stacking
For details about service ports on S series fixed switches that support stacking, click Typical Configuration Examples and choose Typical Stack Configuration of Fixed Switches- Determining the Stack Connection Mode and Hardware and Software Requirements. This section describes whether each model and version of S series fixed switches supports stacking as well as stack modes, hardware and software requirements, typical networking, and configuration steps to set up stacks.

Can two of the 10GE ports of a CE5800 switch set up a stack and the other two be used as service ports
CE5810EI, CE5855EI and CE5850HI support this application but CE5850EI does not. When 10GE ports of a CE5850EI are used for stack connections, all the four 10GE ports must be configured as physical member ports and cannot function as service ports again. This restriction does not apply to CE5810EI, CE5855EI and CE5850HI.

Restore a stack port to a service port on an S series switch
For S series switches of versions later than V200R002, run the following command: [HUAWEI] interface stack-port 0/1 [HUAWEI-stack-port0/1] shutdown interface xgigabitethernet 0/0/5 [HUAWEI-stack-port0/1] undo port interface xgigabitethernet 0/0/5 enable For V200R002 and later versions: 1. S5700LI or S5710EI [HUAWEI] interface stack-port 0/1 [HUAWEI-stack-port0/1] undo port member-group interface gigabitethernet 0/0/28 [HUAWEI-stack-port0/1] quit [HUAWEI] undo stack port interface gigabitethernet 0/0/28 enable 2. S6700EI [HUAWEI] interface stack-port 0/1 [HUAWEI-stack-port0/1] undo port member-group interface xgigabitethernet 0/0/1 [HUAWEI-stack-port0/1] undo port member-group interface xgigabitethernet 0/0/2 [HUAWEI-stack-port0/1] undo port member-group interface xgigabitethernet 0/0/3 [HUAWEI-stack-port0/1] undo port member-group interface xgigabitethernet 0/0/4 [HUAWEI-stack-port0/1] quit [HUAWEI] undo stack port interface xgigabitethernet 0/0/1 to 0/0/4 enable

Can only one service port be used as a stack port for CE switches
Yes. To improve reliability, you are advised to add at least two physical member ports to each stack port.

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