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how to set the interface 3(unnumbered) of neutron node in a vm

i'm trying to setup a network node in a virtual machine by following http://docs.openstack.org/juno/install-guide/install/apt/content/ch_basic_environment.html#basics-networking

1: i have setup 2 interface: interface 1(eth0): 10.0.0.21/24 interface 2(eth1): 10.0.1.21/24

my interface 1 can access the external network and its floating ip is 15.126.210.122

/etc/neutron/plugins/ml2/ml2_conf.ini [ovs] local_ip = 10.0.1.21 enable_tunneling = True bridge_mappings = external:br-ex

after i bridge to eth0 , i lost the connect to 15.126.210.122 and ssh to both 10.0.0.21/10.0.1.21 failed

ovs-vsctl add-port br-ex eth0

how to set the interface 3(unnumbered) of neutron node in a vm?