How to Setup Link Aggregation

LAN port aggregation is now supported in firmware version 4.4.0 and above. This feature is available in the Vigor2865, Vigor2866, Vigor2927 and Vigor2962 routers. Link aggregation allows you to combine multiple physical links into one logical link to deliver higher bandwidth as well as increased resiliency for the Ethernet LAN connection. This article shows how to setup link aggregation in static mode between a Vigor2927 and a VigorSwitch P2280x.

Router Setup

1. Go to LAN >> Link Aggregation, select “Enable” and click “OK”.
   Note: Vigor Router only supports link aggregation in static mode on ports P2&P3, LACP is not supported.

2. For LAG settings on Vigor2962 model, Go to LAN >> Link Aggregation and edit the settings as follows:
1. Apply the LAG Group number to the designated ports.
   Note:
• Vigor2962 supports up to 2 LAG groups.
• LAG can be applied to all LAN ports, you can go to Port Setup page to check the status.

2. Select a LAG mode for the LAG Group.
   Note:
• Active-backup mode only provides fault tolerance.
• Both balance modes can support fault tolerance and load balancing.
• LACP is not supported either.

Switch Setup

1. Go to Switch LAN > Link Aggregation > LAG Settings, select “IP/Mac Address” option and click “Apply”.

2. Go to Switch LAN > Link Aggregation > LAG Management, select a LAG port and click the edit button.
1. Enter Name.
2. Choose static in Type.
3. Select ports on switch that you would like to connect to router.
   

3. Go to Switch LAN > VLAN Management > Interface Settings, assign correct VLAN interface settings for the LAG port.

4. Connect physical network cables between router and switch.
   To check LAG status, go to LAN >> Link Aggregation page on the router.
   
   Or go to Switch LAN >> Link Aggregation >> LAG Management page on the switch.
   

Performance Test

We can use iperf tool to test if the bandwidth of aggregated link is more than one physical link.
Topology:
PC1(P4) / PC2(P5) – V2865(P2+P3) == LAG == (P1+P3)P2280 – PC3(P5) / PC4(P7)

TX iperf test:			RX iperf test:
PC1 → PC3	∼ 949 Mbps		PC1 → PC3	∼ 934 Mbps
PC2 → PC4	∼ 942 Mbps		PC2 → PC4	∼ 942 Mbps
Total:	∼ 1.8 Gbps		Total:	∼ 1.8 Gbps

The total throughput of aggregated link is over 1G in both TX & RX test.