I haven’t found a lot of documentation about it, but basically, here’s how to do it. Lets assume the following:
- you start from a single external network, which is connected to ‘br-ex’
- you want to attach the new external network to ‘eth1’.
In the network node (were neutron-l3-agent, neutron-dhcp-agent, etc.. run):
- Create a second OVS bridge, which will provide connectivity to the new external network:
ovs-vsctl add-br br-eth1 ovs-vsctl add-port br-eth1 eth1 ip link set eth1 up
- (Optionally) If you want to plug a virtual interface into this bridge and add a local IP on the node to this network for testing:
ovs-vsctl add-port br-eth1 vi1 – set Interface vi1 type=internal ip addr add 192.168.1.253/24 dev vi1 # you may adjust your network CIDR, or set your system configuration to setup this at boot.
- Edit your /etc/neutron/l3_agent.ini , and set/change:
gateway_external_network_id = external_network_bridge =
This change tells the l3 agent that it must relay on the physnet<->bridge mappings at /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini it will automatically patch those bridges and router interfaces around. For example, in tunneling mode, it will patch br-int to the external bridges, and set the external ‘q’router interfaces on br-int.
- Edit your /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini to map ‘logical physical nets’ to ‘external bridges’
bridge_mappings = physnet1:br-ex,physnet2:br-eth1
- Restart your neutron-l3-agent and your neutron-openvswitch-agent
service neutron-l3-agent restart service neutron-openvswitch-agent restart
At this point, you can create two external networks (please note, if you don’t make the l3_agent.ini changes, the l3 agent will start complaining and will refuse to work)
neutron net-create ext_net –provider:network_type flat –provider:physical_network physnet1 –router:external=True neutron net-create ext_net2 –provider:network_type flat –provider:physical_network physnet2 –router:external=True
And for example create a couple of internal subnets and routers:
# for the first external net neutron subnet-create ext_net –gateway 172.16.0.1 172.16.0.0/24 – –enable_dhcp=False # here the allocation pool goes explicit…. all the IPs available.. neutron router-create router1 neutron router-gateway-set router1 ext_net neutron net-create privnet neutron subnet-create privnet –gateway 192.168.123.1 192.168.123.0/24 –name privnet_subnet neutron router-interface-add router1 privnet_subnet# for the second external net neutron subnet-create ext_net2 –allocation-pool start=192.168.1.200,end=192.168.1.222 –gateway=192.168.1.1 –enable_dhcp=False 192.168.1.0/24 neutron router-create router2 neutron router-gateway-set router2 ext_net2 neutron net-create privnet2 neutron subnet-create privnet2 –gateway 192.168.125.1 192.168.125.0/24 –name privnet2_subnet neutron router-interface-add router2 privnet2_subnet