Using a 10 Gigabit Switch for Aggregation

You can perform 10GbE aggregation by creating a Link Aggregation Group (LAG) using IEEE 802.3ad/LACP, combining multiple 10GbE ports into a single logical link for higher bandwidth and redundancy.

Key Concepts

Link Aggregation (LAG) allows multiple physical Ethernet ports to act as a single logical interface, increasing throughput and providing failover if one link fails . LACP (Link Aggregation Control Protocol) is commonly used to dynamically manage these aggregated links . All member ports must typically have the same speed (10GbE) and operate in full-duplex mode .

Steps to Configure 10GbE Aggregation

1. Check Switch Support: Ensure your switch supports 10GbE aggregation and LACP. Some models, like certain Cisco 2960S ports, may not support aggregation for dual-purpose uplinks .

2. Select Ports: Choose the 10GbE ports to include in the LAG. For UniFi switches, ports must be sequentially numbered to work correctly .

3. Create the LAG:

   • On Juniper switches, configure an Aggregated Ethernet (AE) interface and associate the selected physical ports with it .
   • On HP switches, you can configure a trunk group or 802.3ad LAG, specifying the ports in ascending order starting with the primary port .
   • On UniFi, enable LAG in the switch settings and assign the selected ports to the group .

4. Enable LACP (Optional but Recommended): LACP allows dynamic negotiation and failover between devices. Both ends of the link must support LACP for proper operation .

5. Verify Configuration: Confirm that the LAG is active and that traffic is being balanced across the member links. Load balancing may require multiple devices or flows to fully utilize the aggregated bandwidth .

Best Practices

• Uniform Port Speeds: All aggregated ports should be 10GbE and full-duplex to ensure proper load balancing .
• Redundancy: Aggregation provides failover; if one port fails, traffic continues on remaining links .
• Device Compatibility: Ensure the connected device (server NIC or another switch) supports multiple aggregated links or LACP .
• Sequential Ports: Some switches, like UniFi, require sequential port numbers for LAG to function correctly .

By following these steps, you can effectively aggregate 10GbE ports to increase throughput, improve redundancy, and optimize network performance.