How to cascade optical ports on Huawei switches

To cascade optical ports on Huawei switches, connect matching optical ports between switches, configure them as stack ports, and ensure logical port mapping for redundancy and bandwidth optimization.

Physical Connection Requirements

1. Matching Port Types: Ensure that the optical ports on both switches are of the same type and speed, e.g., SFP or SFP+ modules with identical rates .
2. Port Pairing: For certain models like the S5720-LI, S5720S-LI, and S5720I-SI series, each logical stack port can only include two physical member ports (e.g., stack member ports 1 and 2 or 3 and 4), .
3. Cable Selection: Use high-quality optical cables compatible with the SFP modules. Multiple cables are recommended to increase bandwidth and provide redundancy .
4. Connection Sequence: When stacking multiple switches, connect from top to bottom. Top switch logical stack ports connect to the master ends of cables, bottom switch ports to standby ends, and intermediate switches connect to both ends for proper stacking .

Logical Configuration

1. Assign Physical Ports to Logical Stack Ports: Enter system view and configure the physical optical ports as stack ports. For example, ports XGigabitEthernet0/0/1 to XGigabitEthernet0/0/4 can be grouped as stack member ports .
2. Redundancy Setup: Create two logical stack ports per switch to prevent stack splits caused by a faulty port .
3. Save and Reboot: After configuring stack ports, save the configuration and reboot the switches to apply changes .

Verification and Monitoring

• Use the command display transceiver to check the status of optical modules and ensure proper link operation .
• For specific ports, use display transceiver interface interface-type interface-number to view detailed information such as wavelength, transfer distance, and receive/transmit power .

Best Practices

• Bandwidth Optimization: Use multiple optical links for stacking to increase throughput.
• Model-Specific Considerations: Check Huawei documentation for stack support and limitations for your switch model .
• Port Usage: Stack ports cannot be used as normal service ports; plan your network topology accordingly .
• Redundant Links: If connecting to other network devices, consider using Eth-Trunk and configure STP edge ports to prevent recalculation delays . By following these steps, you can successfully cascade optical ports on Huawei switches, ensuring a reliable, high-bandwidth stack configuration.