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It should not be visible there.

In most cases, where OpenVSwitch driver is used, the br-ex interface is in promiscuous mode, listening to all traffic. It doesn't need to have IPs set to it. It captures all network traffic and routes it through IPtables.

If floating IP addresses don't work for you, make sure you have the br-ex up in promisc. Here is my interface config:

# Public interface for br-ex
allow-hotplug eth2
auto eth2
iface eth2 inet manual
    up ip addr add dev eth2
    up ip link set eth2 promisc on
    up ip link set eth2 up
    up route add default gw dev eth2
    up ip link set br-ex up

Note: This assumes you are using OpenVSwitch + GRE tunnels as your networking solution.