How to perform aggregation on an H3C5120 switch

Link aggregation on an H3C S5120 switch combines multiple physical ports into a single logical interface to increase bandwidth and provide redundancy.

Overview of Link Aggregation

Link aggregation (also called LAG or port trunking) allows multiple physical Ethernet links to be bundled into one logical interface. Benefits include: Increased bandwidth: Traffic is distributed across all member ports. Improved reliability: If one port fails, traffic is automatically switched to other member ports.

Simplified management: The aggregate interface is treated as a single logical port for VLANs and routing.

H3

C switches support Layer 2 aggregation, where member ports are Ethernet interfaces, and Layer 3 aggregation, which can carry routed traffic. Aggregation groups can operate in static/manual mode or dynamic mode using LACP (Link Aggregation Control Protocol),.

Step-by-

Step Configuration (CLI)Access the switch CLI Connect via console, Telnet, or SSH. Enter system view mode:system-view Create an aggregation group For example, to create aggregation group 1:interface Bridge-Aggregation 1 Add member ports to the aggregation group Assign physical interfaces to the group. For example, to add GigabitEthernet 1/0/1, 1/0/2, and 1/0/3:interface GigabitEthernet 1/0/1port link-aggregation group 1interface GigabitEthernet 1/0/2port link-aggregation group 1interface GigabitEthernet 1/0/3port link-aggregation group 1 Set load-sharing type (optional) By default, H3C uses load-sharing across member ports.

You can verify or configure:display link-aggregation summary This shows the aggregation interface type (BAGG for bridge aggregation) and load-sharing status.

Configure VLA

Ns on the aggregate interface Assign VLANs to the aggregated interface as you would for a single port:interface Bridge-Aggregation 1port link-type accessport default vlan 10 Save the configurationsave VerificationCheck aggregation summary:display link-aggregation summary Confirms member ports, aggregation type, and load-sharing status. Check interface status:display interface Bridge-Aggregation 1 Shows operational status and traffic statistics.

Notes and Best Practices

Ensure all member ports have the same speed and duplex settings.

Use LAC

P for dynamic aggregation if the connected device supports it; otherwise, use static/manual aggregation. Aggregation groups can carry multiple VLANs, but all member ports must be in the same VLAN configuration. Avoid mixing Layer 2 and Layer 3 ports in the same aggregation group.

By following these steps, you can successfully configure link aggregation on an H3C S5120 switch, improving both bandwidth and network resilience.