How to Configure Link Aggregation on Managed Switch

How to Configure Link Aggregation on Managed Switch
This document applies to the firmware version SG3124Fv2.0EN.
 
Introduction to Link Aggregation  
 
Link aggregation provides a means to combine multiple switch ports together to form a higher-bandwidth single logical link, known as a Link Aggregation Group (LAG), whose total bandwidth is approximately the sum of the individual switch ports. For example, a LAG containing two gigabit ports will have 2Gbps bandwidth, and a LAG containing four gigabit ports will have 4Gbps bandwidth. 
 
Link aggregation provides a higher-bandwidth logical link, as well as a fault-tolerant link between two devices. If one of the physical links in the LAG goes down, traffic is automatically redistributed across the remaining links. Once the link comes backs up, traffic will fail back. Besides, link aggregation offers load balancing across multiple physical links. 
 
In a word, link aggregation achieves cascade connection between two devices, and provides bundled high-bandwidth by expensing the number of ports. As a result, it can improve network speed, break network bottleneck, and significantly improve network performance. 
 
Configuration Steps 
 
1. Login to Web UI, and go to the Advanced > Link Aggregation page. 
 
2.Click the Add button below the LAG List, or select the LAG Settings tab to go to the setup page, see the following figure. 
 
 
3. Specify the LAG ID, LAG Name (optional), select the ports that you want to add to the LAG (by selecting the corresponding check boxes), and then click the Save button to save the settings. You can view the LAG in the LAG List
 
4.To add another new LAG, please repeat the above steps. 
 
Configuration Considerations 
 
Take into account the following considerations when you configure link aggregation.
 
1.All ports in a LAG must have the same port settings (except Port Name) which are configured in the Basic > Port Settings page, and must have the same port speed and duplex mode. 
2. All ports in a LAG must belong to the same VLAN, and must have the same tag VLAN port settings (configured in theAdvanced > VLAN > VLAN Port Settings page) if you enable tag-based VLAN on 
the Switch. 
3.A LAG can’t contain the mirroring port. 
4.If LACP or RSTP is enabled on a port, the port cannot be added to any LAG. 
5.All ports in a LAG must have the same rate limiting settings which are configured in the Security > Rate Limitingpage.
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