Huawei switches use fiber optic stacking

Huawei switches support fiber optic stacking through dedicated service ports or stack cards, enabling multiple switches to operate as a single logical device for simplified management and increased bandwidth.

Supported Switch Models

Not all Huawei S series switches support stacking. For fiber optic stacking:

• S2700, S2720, S2750, S3700, S5700, and S6700 series generally support stacking, but some specific models are excluded (e.g., S2700-9TP-EI-AC, S5700-26X-SI-12S-AC) .
• S1700 series switches do not support stacking .
• Always verify the specific model's datasheet to confirm stack support and the type of stack ports available .

Stack Port Types and Fiber Optic Connections

Huawei switches allow stacking via:

1. Dedicated stack cables (zero-configuration stacking): These are pre-certified cables, often using QSFP or SFP+ fiber modules, providing high-speed, low-latency connections between stack members .
2. Service port stacking: Uses existing fiber optic ports configured as stack ports. This method may require manual configuration to designate which ports participate in the stack . Important: Ordinary uplink ports can sometimes be used for stacking, but dedicated stack ports are recommended for reliability and performance .

Stack Topology

• Ring topology: Recommended for redundancy; each switch connects to two neighbors, forming a loop. If one link fails, traffic reroutes automatically .
• Chain topology: Simpler but less resilient; a single link failure can disrupt the stack .

Configuration Best Practices

1. Verify firmware versions: All stack members should run the same VRP version to ensure compatibility .
2. Set member IDs and priorities before connecting stack cables to control master/standby roles .
3. Use bidirectional fiber links for redundancy and higher stack bandwidth .
4. Select stack ports carefully: Ports used for stacking cannot be used for normal service traffic .
5. Connect to the network: Use Eth-Trunk for uplinks and configure edge ports for access devices to prevent STP recalculation .

Stack Capacity and Reliability

• Huawei S series stacks can support up to 9 switches depending on the model .
• Fiber optic stacking provides high bandwidth and low latency, ideal for aggregation layers or high-performance access layers .
• Redundancy features like master/standby roles and ring topology enhance reliability .

Troubleshooting Tips

• Check stack cable integrity and ensure proper port selection.
• Confirm all switches are powered and reachable before stacking.
• Monitor stack status via the master switch to detect link failures or misconfigurations . By following these guidelines, Huawei fiber optic stacking can significantly simplify network management, increase port density, and provide resilient, high-speed inter-switch connectivity.