Type of ports used for stack connections
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- 10GE electrical ports
- 10GE optical ports
- 25GE optical ports
- 40GE optical ports
- 100GE optical ports
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All ports except GE ports can be used for stack connections.
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Number of stack member ports in a stack port
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1-16
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It is recommended that you add at least two stack member ports to a stack port to improve stack link bandwidth and reliability.
It is recommended that the number of member ports is the nth power of 2; otherwise, traffic may fail to be load balanced.
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NOTE: Stack member ports in a stack port must be the same type. For example, 10GE and 40GE ports cannot be added to the same stack port.
On the CE8860EI, CE8861EI, and CE8868EI, physical ports on different subcards can be added to the same stack port.
On the CE6850EI, CE6810EI, CE6810LI, and CE5850EI, if a 10GE port with port number in the range 4N+1 to 4N+4 (N=0, 1, 2, 3...) is configured as a stack member port, all the ports with port numbers 4N+1 to 4N+4 are configured as stack member ports. For example, if you configure 10GE1/0/1 as a stack member port, all the interfaces from 10GE1/0/1 to 10GE1/0/4 are configured as stack member ports.
Among the four 10GE optical ports of a CE5810-48T4S-EI, 10GE1/0/1 and 10GE1/0/2 must be added to the same stack port, and 10GE1/0/3 and 10GE1/0/4 must be added to another stack port. There is no such restriction on other models.
To use 10GE optical ports of a CE5855-48T4S2Q-EI switch for stack connections, you can only add 10GE1/0/1 to 10GE1/0/2 and 10GE ports split from 40GE1/0/2 (40GE1/0/2:1 to 40GE1/0/2:4) to the same logical stack port or add 10GE1/0/3 to 10GE1/0/4 and 10GE ports split from 40GE1/0/1 (40GE1/0/1:1 to 40GE1/0/1:4) to the same logical stack port. To use 40GE optical ports of a CE5855-48T4S2Q-EI switch for stack connections, do not add 40GE1/0/1 and 40GE1/0/2 to the same logical stack port. You can add 40GE1/0/1 and 40GE1/0/2 to different logical stack ports to form a ring topology for high reliability.
10GE optical ports derived from 40GE optical ports on devices except CE7850EI and CE7855EI can be used for stack connections. If 40GE optical ports have been configured as the stack member ports, they cannot be split.
100GE optical ports of the CE8850-64CQ-EI cannot be used for stack connections after being split.
Only 40GE ports aggregated from CE6810-48S-LI's 10GE ports can be used for stack connections.
After 100GE QSFP28 optical ports have 100GE high-speed cables installed and are configured to work at the rate of 40GE using the speed 40000 command, these ports cannot be used for stack connections. If these ports have 40GE optical modules or high-speed cables (40GE auto-sensing), they can be used for stack connections.
25GE SFP28 ports cannot be used for stack connections after their rate is configured to 10 Gbit/s or 1 Gbit/s using the port mode { 10ge | ge } command.
When configuring ports of the CE8860EI, CE8861EI, CE8868EI, CE6857EI, CE6865EI, or CE6860EI as stack member ports, pay attention to the following points: - If a 25GE SFP28 optical port, 10GE RJ45 electrical port or 10GE optical port with port number in the range 4N+1 to 4N+4 (N=0, 1, 2, 3...) needs to be configured as a stack member port, all the ports with port numbers 4N+1 to 4N+4 must be configured as stack member ports.
- If a 40GE QSFP+ optical port needs to be configured as a stack member port, two contiguous ports must be configured as stack member ports; alternatively, four 10GE optical ports split from two contiguous 40GE optical ports can be configured as stack member ports. A 40GE QSFP+ optical port can be split into two 10GE optical ports.
On the CE8860EI and CE8861EI, 25GE interfaces in the CE88-D24S2CQ-U card cannot be used to set up a stack.
- If the license is not installed on a CE8868EI, 25GE SFP28 ports in a CE88-D24S2CQ card work at the rate of 10 Gbit/s (the port mode 10ge command will be configured on these ports) and cannot be used for stack connections. To use 25GE SFP28 ports for stack connections, you need to install the license and run the undo port mode 10g command to enable the ports to work at the rate of 25 Gbit/s.
On the CE8850EI, if a 10GE optical port needs to be configured as a stack member port, two contiguous ports must be configured as stack member ports. That is, both 10GE1/0/1 and 10GE1/0/2 must be configured as stack member ports.
For the CE6880-48S4Q2CQ-EI and CE6880-48T4Q2CQ-EI, when 10GE interfaces numbered 1 to 12 are used to form a stack, stacking packets enter the interface queue corresponding to priority 7, and non-stacking packets with priority 7 enter the interface queue corresponding to priority 6. In this case, the interface queue corresponding to priority 6 is congested and packets are lost. When the CE6880-48S4Q2CQ-EI or CE6880-48T4Q2CQ-EI is used in a stack, 40GE/100GE interfaces are recommended. If 10GE interfaces are used, 10GE interfaces numbered 13 to 48 are recommended.
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NOTE: 
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