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Why is ODL adding port eth1 to br-int by default

On my ODL and Openstack setup, after I configure the OVS switch to be managed by ODL, two bridges are created:

br-int and br-ex.

For some reason ODL seems to add port eth1 to br-int by default

ovs-vsctl show
1fb6f2bf-3386-49d0-8a1c-16191307b82f
    Manager "tcp:192.168.120.254:6640"
    Bridge br-int
        Controller "tcp:192.168.120.254:6653"
        fail_mode: secure
        Port "eth1"
            Interface "eth1"
                error: "could not open network device eth1 (No such device)"
        Port br-int
            Interface br-int
                type: internal
    Bridge br-ex
        Controller "tcp:192.168.120.254:6653"
        fail_mode: secure
        Port br-ex
            Interface br-ex
                type: internal
    ovs_version: "2.5.0"

On my setup I don't have eth1, instead its

enp0s3 enp0s8 enp0s9

I haven't configured eth1 anywhere, so why does this get added by default?