No it does not. There can be no Active/Passive. A cluster is always Active/Active. Both units are handling traffic all the time.
This is what I found in the help section on the appliance.
After the Barracuda Spam Firewall has joined the cluster, in the Clustered Systems section of the page, use the Mode drop-down to designate its mode:
- Active (recommended) - An active system filters traffic and shares data with the rest of the systems in the cluster.
- Standby - A standby system filters traffic but does not share data with the other systems.
This means that both units will handle traffic all the time and the only difference is that a member that is "standby" does not share info with the other member(s). However it still does handle traffic. Both units are "active" by default.
BarryGo to the full post