Link aggregation groups
The Link Aggregation Groups (LAG) functionality allows you to group two or more ports on your SD-WAN appliance to work together as a single port. This ensures increased availability, link redundancy, and enhanced performance.
Earlier, only the Active-Backup mode was supported in LAG. From 11.3 release onwards, the 802.3AD Link Aggregation Control Protocol (LACP) protocol based negotiations are supported. The LACP is a standard protocol and provides more functionality for LAGs.
In Active-Backup mode, at any time only one port is active and the other ports are in backup mode. The active and backup supports rely on the Data Plane Development Kit (DPDK) package for LAG functionality.
With the LACP, you can send the traffic through all the ports simultaneously. As a benefit, you get more bandwidth along with the link redundancy mechanism. The LACP implementation supports the Active-Active mode. Now with the Active-Backup mode, you also can select full LACP Active-Active mode from the SD-WAN UI.
The LAG functionality is available only on the following DPDK supported platforms:
- Citrix SD-WAN 110 SE
- Citrix SD-WAN 210 SE
- Citrix SD-WAN 410 SE
- Citrix SD-WAN 1100 SE/PE
- Citrix SD-WAN 4000, 4100, and 5100 SE
- Citrix SD-WAN 6100 SE
The LAG functionality is not supported on VPX/VPXL platforms.
To configure link aggregation groups, at the site level, navigate to Configuration > Advanced Settings > LAG and select the member Ethernet interfaces to form a link aggregation group.
You can create a maximum of 4 LAGs with a maximum of 4 ports grouped in each LAG on the Citrix SD-WAN appliances.
For the Citrix SD-WAN 210 and 410 appliances, a maximum of 3 LAGs and for the Citrix SD-WAN 110 appliance, a maximum of 2 LAGs can be created.
Once the ports are added to the LAG, you can select the LAGs to configure interfaces under Site Configuration. These interfaces are further used to configure LAN/WAN links and HA. You cannot change settings for individual member ports, any configuration changes made to the LAG, is automatically pushed to the member ports.
In the Interfaces section, click Link Aggregation Group to quickly change the LAG configuration if necessary.