ZyXEL Communications USG310 - How to Set up Link Aggregation Group (LAG); Set up the Active-Backup, 802.3 Ad, Balance-Alb

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How to set up Link Aggregation Group (LAG)
A Link Aggregation Group (LAG) allows you to combine a number of physical ports
together to create a single high bandwidth data path. It helps to implement the traffic
to perform load balancing or failover features, depending on the situation of the
actual case.
LAG interface supported models: ZyWALL 310/1100/1900, USG 310/1100/1900
The link aggregation supported models have Active-backup, 802.3ad (LACP), and
Balance-alb modes. Link aggregation supports IPSec tunnel, VLAN, and bridge
interface.
Device HA Pro is supported on the LAG interface but Device HA is not.
Set up the Active-backup, 802.3ad, Balance-alb
Active-backup Mode:
(Does not require switch configuration and one or multiple switches can be used.)
Only the USG needs to be configured. You do not need to change any settings on the
switch.