Can two 40GE ports of a CE5855 switch be added to the same logical stack port

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Two 40GE ports of a CE5855-48T4S2Q-EI cannot be added to the same logical stack port.
Two 40GE ports of a CE5855-24T4S2Q-EI can be added to the same logical stack port.

Other related questions:
Can ports on different devices be added to the same VS after a stack is set up
The ports on different devices can be assigned to the same VS after a stack is set up.

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.

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.

Can a stack be set up using only one 40GE port on a member CE switch
A stack can be set up using only one 40GE port on a member CE switch. To ensure reliability, it is recommended that a stack be set up using two or more ports.

Whether the observing port and the mirroring port of the S-series switch need to be added to the same VLAN
For S-series switches, mirroring ports and observing ports do not need to be added to the same VLAN when configuring port mirroring. You can run command observe-port to forward mirrored traffic to the local or remote, do not need to add observe the port the VLAN.

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