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Aggregation Switch S6720

Fiber and communications infrastructure knowledge brief Published 25 Aug 2026

Prepared for preliminary research by the ENSAA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Link aggregation (Eth-Trunk) on S6720 switches combines multiple physical interfaces into a single logical link to increase bandwidth, improve reliability, and enable load balancing.

Overview

Link aggregation, also called Eth-Trunk on Huawei switches, allows multiple Ethernet ports to operate as a single logical interface. This provides: Increased bandwidth by combining multiple links. Redundancy: if one link fails, traffic continues on remaining links.

Load balancing: traffic is distributed across member links based on hashing algorithms. S6720 switches support both static and dynamic (LACP) aggregation, and aggregated links can carry VLANs, voice VLANs, and other Ethernet services.

Configuration Steps

Enter System ViewCodeCopysystem-view Create an Eth-Trunk InterfaceCodeCopyinterface Eth-Trunk is a unique identifier for the aggregated link. Configure Load Balancing Mode (Optional)CodeCopyeth-trunk load-balance {src-dst-ip | src-dst-mac | src-dst-port} Choose a method based on traffic type to optimize distribution. Add Physical Interfaces to the Eth-TrunkCodeCopyinterface GigabitEthernet 0/0/1eth-trunk member Repeat for each port to be aggregated.

Enable LAC

P (for dynamic aggregation)CodeCopyinterface Eth-Trunk mode lacp LACP ensures automatic negotiation with the peer switch.

Assign VLA

Ns to the Eth-TrunkCodeCopyinterface Eth-Trunk port link-type trunkport trunk allow-pass vlan This allows the aggregated link to carry multiple VLANs. Verify ConfigurationCodeCopydisplay eth-trunkdisplay eth-trunk Check member ports, operational status, and load balancing.

Best Practices

Ensure all member ports have identical speed, duplex, and VLAN configuration.

Use LAC

P for dynamic negotiation to prevent misconfiguration. Avoid mixing access and trunk ports in the same Eth-Trunk. Monitor link status and traffic distribution to detect uneven load or failures.

Troubleshooting

If an Eth-Trunk fails to form, check port compatibility, VLAN settings, and LACP mode. Use display interface and display eth-trunk to identify down or misconfigured member ports. Ensure peer switch supports the same aggregation protocol and configuration.

By following these steps, you can successfully configure link aggregation on Huawei S6720 switches, improving network performance, redundancy, and scalability.

Aggregation Switch S6720 - ENSAA OPTICAL NETWORKS [PDF]

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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