Open Stack

I ran stack.sh in one controller node and two compute nodes.
Q_ML2_TENANT_NETWORK_TYPE in local.conf is set to vxlan in all nodes. after
starting an instance, I saw the ovs configuration as follows. my question
is why there are vxlan ports on both br-int and br-tun? if I send a packet
from the instance, which path will it go?

1. "tape8f9588f-5e" -> patch-tun -> patch-int -> "vxlan-ac160965" and
"vxlan-ac1f007d"
2. "tape8f9588f-5e" -> "vxlan-172.31.0.125" and "vxlan-172.22.9.101"

# sudo ovs-vsctl show
    Manager "tcp:172.22.9.100:6640"
        is_connected: true
    Bridge br-tun
        Controller "tcp:172.22.9.100:6633"
            is_connected: true
        Port br-tun
            Interface br-tun
                type: internal
        Port "vxlan-ac160965"
            Interface "vxlan-ac160965"
                type: vxlan
                options: {in_key=flow, local_ip="172.22.9.65",
out_key=flow, remote_ip="172.22.9.101"}
        Port patch-int
            Interface patch-int
                type: patch
                options: {peer=patch-tun}
        Port "vxlan-ac1f007d"
            Interface "vxlan-ac1f007d"
                type: vxlan
                options: {in_key=flow, local_ip="172.22.9.65",
out_key=flow, remote_ip="172.31.0.125"}
    Bridge br-int
        Controller "tcp:172.22.9.100:6633"
            is_connected: true
        Port br-int
            Interface br-int
                type: internal
        Port "vxlan-172.31.0.125"
            Interface "vxlan-172.31.0.125"
                type: vxlan
                options: {key=flow, local_ip="172.22.9.65",
remote_ip="172.31.0.125"}
        Port "tape8f9588f-5e"
            tag: 1
            Interface "tape8f9588f-5e"
        Port "vxlan-172.22.9.101"
            Interface "vxlan-172.22.9.101"
                type: vxlan
                options: {key=flow, local_ip="172.22.9.65",
remote_ip="172.22.9.101"}
        Port patch-tun
            Interface patch-tun
                type: patch
                options: {peer=patch-int}
    ovs_version: "2.1.90"
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