ZyXEL Communications VPN Series Handbook page 660

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Set Up the Trunk on the ZyWALL/USG
In the ZyWALL/USG, go to CONFIGURATION > Network > Interface > Trunk > User
Configuration > Add Trunk, configure a Name for you to identify the Trunk profile
and set the Load Balancing Algorithm field to be the Weighted Round Robin.
Add wan1 and enter 3 in the Weight column. Add wan2 and enter 2 in the Weight
column. Add cellular1, change Mode to be the Passive mode, enter 1 in the
Weight column. Click OK to return to the Configuration screen.
CONFIGURATION > Network > Interface > Trunk > User Configuration > Add Trunk
In the Configuration screen, go to Default WAN Trunk section, select User
Configured Trunk and select the newly created Trunk from the list box. Click
Apply.
CONFIGURATION > Network > Interface > Trunk > Default WAN Trunk > User
Configured Trunk
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