openstack-flat 网络问题

使用packstack安装，版本为M，默认为vxlan网络， 操作系统为centos7.

由于学习的需要修改为flat网络。

首先修改配置文件：

/etc/neutron/plugins/ml2/ml2_conf.ini

type_drivers = flat

tenant_network_types =flat

mechanism_drivers =openvswitch

flat_networks = physnet1

然后修改/etc/neutron/plugins/ml2/openvswitch_agent.ini

bridge_mappings = physnet1:br-phy

增加ovs br-phy,并且绑定对外端口：

[[email protected] ml2]# ovs-vsctl show
73bdadc0-287a-4c0f-9c54-6ad6fb575347
    Bridge br-ex
        Port "qg-2ccfa701-cd"
            Interface "qg-2ccfa701-cd"
                type: internal
        Port br-ex
            Interface br-ex
                type: internal
    Bridge br-phy
        Port "enp0s3"
            Interface "enp0s3"
        Port phy-br-phy
            Interface phy-br-phy
                type: patch
                options: {peer=int-br-phy}
        Port br-phy
            Interface br-phy
                type: internal

　　然后重启service：    neutron-server  neutron-dhcp-agent neutron-openvswitch-agent

创建网络：

创建一个instance，使用这个网络。

但是instance创建完成后，不能够与外界通信。

自己尝试分析原因：

[[email protected] ml2]# brctl show
bridge name bridge id STP enabled interfaces
qbr187d132b-9d 8000.ce4f9fccba4d no qvb187d132b-9d
　　　　　　　　　　　　　　　　　　tap187d132b-9d

instance创建一个linux bridge, 端口为qvb187d132b-9d。

[[email protected] ml2]# ovs-vsctl show
73bdadc0-287a-4c0f-9c54-6ad6fb575347
    Bridge br-ex
        Port "qg-2ccfa701-cd"
            Interface "qg-2ccfa701-cd"
                type: internal
        Port br-ex
            Interface br-ex
                type: internal
    Bridge br-phy
        Port "enp0s3"
            Interface "enp0s3"
        Port phy-br-phy
            Interface phy-br-phy
                type: patch
                options: {peer=int-br-phy}
        Port br-phy
            Interface br-phy
                type: internal
    Bridge br-tun
        fail_mode: secure
        Port br-tun
            Interface br-tun
                type: internal
        Port patch-int
            Interface patch-int
                type: patch
                options: {peer=patch-tun}
    Bridge br-flat
        Port br-flat
            Interface br-flat
                type: internal
        Port phy-br-flat
            Interface phy-br-flat
                type: patch
                options: {peer=int-br-flat}
    Bridge br-int
        fail_mode: secure
        Port int-br-phy
            Interface int-br-phy
                type: patch
                options: {peer=phy-br-phy}
        Port "int-br-eth0"
            Interface "int-br-eth0"
                type: patch
                options: {peer="phy-br-eth0"}
        Port br-int
            Interface br-int
                type: internal
        Port "tap239b2780-1b"
            tag: 2
            Interface "tap239b2780-1b"
                type: internal
        Port int-br-flat
            Interface int-br-flat
                type: patch
                options: {peer=phy-br-flat}
        Port "qvo187d132b-9d"
            tag: 1
            Interface "qvo187d132b-9d"
        Port "qr-9e110b6b-5d"
            tag: 2
            Interface "qr-9e110b6b-5d"
                type: internal
        Port "tap2b05a39d-da"
            tag: 1
            Interface "tap2b05a39d-da"
                type: internal
        Port patch-tun
            Interface patch-tun
                type: patch
                options: {peer=patch-int}
    ovs_version: "2.5.0"

linux bridge 连接到bridage br-int 而不是预期的 bridge br-phy.

谁能帮忙看看这个问题的原因何在？

非常感谢。