Open Stack

Hello,I'm trying to deploy the simple setup that I can, I use juno on debian, but I have some trouble with networking.
This is my nova conf about networking:
network_manager=nova.network.manager.FlatManagerflat_injected=truefirewall_driver=nova.virt.libvirt.firewall.IptablesFirewallDrivermulti_host=true
I try to create a net with the following command:
nova-manage network create --label='SVILUPPO' \--fixed_range_v4=192.168.156.0/24 --num_networks=1 \--network_size=256 --gateway=192.168.156.1 \--vlan=632 --bridge_interface=br-sviluppo \--dns1 8.8.8.8 --dns2 8.8.4.4 --project ab7747187e6942749d58450487993d12
...and I try to boot an instance:
nova boot --flavor 1 --image 71c8e427-df72-444d-ba06-e8bef2c404b2 \--nic net-id=54a3b09c-8b61-49a7-a9af-f453d5c64f1a,v4-fixed-ip=192.168.156.12 cirros

The vm boot, but there is no nic, only the loopback interface.
What I'm doing wrong ?
Please help.
BR
P.
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