Create the base Neutron networks

Create the ext-net external network. This network represents a slice of the outside world. VMs are not directly linked to this network; instead, they connect to internal networks. Outgoing traffic is routed by Neutron to the external network. Additionally, floating IP addresses from the subnet for ext-net might be assigned to VMs so that the external network can contact them. Neutron routes the traffic appropriately.

# neutron net-create ext-net -- --router:external=True SPECIAL_OPTIONS

Create the associated subnet with the same gateway and CIDR as EXTERNAL_INTERFACE. It does not have DHCP because it represents a slice of the external world:

# neutron subnet-create ext-net \
  --allocation-pool start=FLOATING_IP_START,end=FLOATING_IP_END \
  --gateway=EXTERNAL_INTERFACE_GATEWAY --enable_dhcp=False \
  EXTERNAL_INTERFACE_CIDR

Create one or more initial tenants, for example:

# keystone tenant-create --name DEMO_TENANT

See the section called “Define users, tenants, and roles” for further details.

Create the router attached to the external network. This router routes traffic to the internal subnets as appropriate. You can create it under a given tenant: Append --tenant-id option with a value of DEMO_TENANT_ID to the command.

Use the following to quickly get the DEMO_TENANT tenant-id:

# keystone tenant-list | grep DEMO_TENANT | awk '{print $2;}'

Then create the router:

# neutron router-create ext-to-int --tenant-id DEMO_TENANT_ID

Connect the router to ext-net by setting the gateway for the router as ext-net:

# neutron router-gateway-set EXT_TO_INT_ID EXT_NET_ID

Create an internal network for DEMO_TENANT (and associated subnet over an arbitrary internal IP range, such as, 10.5.5.0/24), and connect it to the router by setting it as a port:

# neutron net-create --tenant-id DEMO_TENANT_ID demo-net SPECIAL_OPTIONS
# neutron subnet-create --tenant-id DEMO_TENANT_ID demo-net 10.5.5.0/24 --gateway 10.5.5.1
# neutron router-interface-add EXT_TO_INT_ID DEMO_NET_SUBNET_ID

Check the special options page for your plug-in for remaining steps. Now, return to the general OVS instructions.