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How to make ODL create vxlan tunnel?

Hi everyone, I am working on Opendaylight Lithium SR3 integrated with OpenStack liberty on Ubuntu14.04, my environment is 3 controllers in HA mode and 2 computes and ODL are deployed as cluster mode on the same machines as 3 controllers.

I set openstack manage network, openstack storage network and openstack external network on the same NIC, of course manage network and storage network go through different vlan. openstack external network is created by openvswitch.

tenantnetworktype is vxlan, so openvswitch has three bridge, br-tun for vxlan, br-int, br-ex for external.

due to odl official document, I removed ovs conf db, also I recover br-ex for external network, but odl doesn't create vxlan channel to each node. so that the instances could not ping to each other.

I thought this should be about features I installed, my initial features are config,standard,region,package,kar,ssh,management,odl-base-all,odl-restconf,odl-ovsdb-openstack,odl-dlux-all,odl-mdsal-apidocs, later I have tried odl-l2switch-switch-ui and odl-openflowplugin-flow-service-ui, and still doesn't work.

could anyone tell me what I should configure?

btw, I refer to set odl as cluster mode? is it correct?