ZyXEL Communications USG40 User Manual page 721

In this case the ZyWALL/USGs are already connected, but the bridge faces have not been
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configured yet. Configure a disabled bridge interface on the master ZyWALL/USG but disable it.
Then set the bridge interface as a monitored interface, and activate Device HA.
Configure a corresponding disabled bridge interface on the backup ZyWALL/USG. Then set the
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bridge interface as a monitored interface, and activate Device HA.
Enable the bridge interface on the master ZyWALL/USG and then on the backup ZyWALL/USG.
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Connect the ZyWALL/USGs.
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Chapter 41 Device HA
Br0 {ge4, ge5}
A
B
Br0 {ge4, ge5}
A
B
Br0 {ge4, ge5}
Br0 {ge4, ge5}
A
B
Br0 {ge4, ge5}
ZyWALL/USG Series User's Guide
721
Disabled
Disabled
Disabled