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 physical 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 physical 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: - Physical 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, 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 physical member port, all the ports with port numbers 4N+1 to 4N+4 are configured as physical member ports. For example, if you configure 10GE1/0/1 as a physical member port, all the interfaces from 10GE1/0/1 to 10GE1/0/4 are configured as physical 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 connection, 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 connection, do not add 40GE1/0/1 and 40GE1/0/2 to the same logical stack port.
- 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 physical member ports, they cannot be split.
- Only 40GE ports aggregated from CE6810-48S-LI's 10GE ports can be used for stack connections.
- 100GE QSFP28 ports cannot be used for stack connections after their rate is configured to 40 Gbit/s using the speed 40000 command.
- 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, CE6860EI, or CE6865EI as physical stack ports, pay attention to the following points:
- If a 25GE SFP28 optical port or 10GE RJ45 electrical port with port number in the range 4N+1 to 4N+4 (N=0, 1, 2, 3...) needs to be configured as a physical member port, all the ports with port numbers 4N+1 to 4N+4 must be configured as physical member ports.
- If a 40GE QSFP+ optical port needs to be configured as a physical member port, two contiguous ports must be configured as physical member ports; alternatively, four 10GE optical ports split from two contiguous 40GE optical ports can be configured as physical member ports. A 40GE QSFP+ optical port can be split into two 10GE optical ports.
- 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 and 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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