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[devstack/quantum] Configuration issue

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Hi,
This morning I encountered a problem (which did not happen a few days ago :)). When devstack is launched, with quantum configured, the gateway and bridge devices are created. This causes problems with quantum.
For example when devstack is up and running prior to deploying an instance we have: 

brq744ec2f4-c0 Link encap:Ethernet  HWaddr fa:16:3e:03:a6:55
          inet addr:10.0.0.1  Bcast:0.0.0.0  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

gw-744ec2f4-c0 Link encap:Ethernet  HWaddr fa:16:3e:03:a6:55
          inet addr:10.0.0.1  Bcast:10.0.0.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

When an instance is deployed the following happens:
2012-05-15 01:59:18 DEBUG nova.utils [req-4d50ed10-46e1-406c-9074-dc45da860365 df07eec326434b25800f3ebc17202fb3 2cafe0be4d7740098a89be39ffd1b72e] Running cmd (subprocess): sudo /usr/local/bin/nova-rootwrap ip address add 10.0.0.1/24 dev brq744ec2f4-c0 from (pid=4234) execute /opt/stack/nova/nova/utils.py:178 2012-05-15 01:59:18 DEBUG nova.utils [req-4d50ed10-46e1-406c-9074-dc45da860365 df07eec326434b25800f3ebc17202fb3 2cafe0be4d7740098a89be39ffd1b72e] Result was 254 from (pid=4234) execute /opt/stack/nova/nova/utils.py:194 2012-05-15 01:59:18 ERROR nova.rpc.amqp [req-4d50ed10-46e1-406c-9074-dc45da860365 df07eec326434b25800f3ebc17202fb3 2cafe0be4d7740098a89be39ffd1b72e] Exception during message handling 
2012-05-15 01:59:18 TRACE nova.rpc.amqp Traceback (most recent call last):
2012-05-15 01:59:18 TRACE nova.rpc.amqp File "/opt/stack/nova/nova/rpc/amqp.py", line 263, in _process_data 2012-05-15 01:59:18 TRACE nova.rpc.amqp rval = node_func(context=ctxt, **node_args) 2012-05-15 01:59:18 TRACE nova.rpc.amqp File "/opt/stack/nova/nova/network/quantum/manager.py", line 390, in allocate_for_instance 2012-05-15 01:59:18 TRACE nova.rpc.amqp network, vif_rec, network['net_tenant_id']) 2012-05-15 01:59:18 TRACE nova.rpc.amqp File "/opt/stack/nova/nova/utils.py", line 880, in inner 
2012-05-15 01:59:18 TRACE nova.rpc.amqp     retval = f(*args, **kwargs)
2012-05-15 01:59:18 TRACE nova.rpc.amqp File "/opt/stack/nova/nova/network/quantum/manager.py", line 501, in enable_dhcp 2012-05-15 01:59:18 TRACE nova.rpc.amqp self.l3driver.initialize_gateway(network_ref) 2012-05-15 01:59:18 TRACE nova.rpc.amqp File "/opt/stack/nova/nova/network/l3.py", line 98, in initialize_gateway 2012-05-15 01:59:18 TRACE nova.rpc.amqp gateway=(network_ref['gateway'] is not None)) 2012-05-15 01:59:18 TRACE nova.rpc.amqp File "/opt/stack/nova/nova/network/linux_net.py", line 900, in plug 2012-05-15 01:59:18 TRACE nova.rpc.amqp return _get_interface_driver().plug(network, mac_address, gateway) 2012-05-15 01:59:18 TRACE nova.rpc.amqp File "/opt/stack/nova/nova/network/linux_net.py", line 1160, in plug 
2012-05-15 01:59:18 TRACE nova.rpc.amqp     run_as_root=True)
2012-05-15 01:59:18 TRACE nova.rpc.amqp File "/opt/stack/nova/nova/utils.py", line 201, in execute 
2012-05-15 01:59:18 TRACE nova.rpc.amqp     cmd=' '.join(cmd))
2012-05-15 01:59:18 TRACE nova.rpc.amqp ProcessExecutionError: Unexpected error while running command. 2012-05-15 01:59:18 TRACE nova.rpc.amqp Command: sudo /usr/local/bin/nova-rootwrap ip address add 10.0.0.1/24 dev brq744ec2f4-c0 
2012-05-15 01:59:18 TRACE nova.rpc.amqp Exit code: 254
2012-05-15 01:59:18 TRACE nova.rpc.amqp Stdout: ''
2012-05-15 01:59:18 TRACE nova.rpc.amqp Stderr: 'RTNETLINK answers: File exists\n' 
2012-05-15 01:59:18 TRACE nova.rpc.amqp
2012-05-15 01:59:18 ERROR nova.rpc.common [req-4d50ed10-46e1-406c-9074-dc45da860365 df07eec326434b25800f3ebc17202fb3 2cafe0be4d7740098a89be39ffd1b72e] Returning exception Unexpected error while running command. Command: sudo /usr/local/bin/nova-rootwrap ip address add 10.0.0.1/24 dev brq744ec2f4-c0 
Exit code: 254
Stdout: ''
Stderr: 'RTNETLINK answers: File exists\n' to caller
2012-05-15 01:59:18 ERROR nova.rpc.common [req-4d50ed10-46e1-406c-9074-dc45da860365 df07eec326434b25800f3ebc17202fb3 2cafe0be4d7740098a89be39ffd1b72e] ['Traceback (most recent call last):\n', ' File "/opt/stack/nova/nova/rpc/amqp.py", line 263, in _process_data\n rval = node_func(context=ctxt, **node_args)\n', ' File "/opt/stack/nova/nova/network/quantum/manager.py", line 390, in allocate_for_instance\n network, vif_rec, network[\'net_tenant_id\'])\n', ' File "/opt/stack/nova/nova/utils.py", line 880, in inner\n retval = f(*args, **kwargs)\n', ' File "/opt/stack/nova/nova/network/quantum/manager.py", line 501, in enable_dhcp\n self.l3driver.initialize_gateway(network_ref)\n', ' File "/opt/stack/nova/nova/network/l3.py", line 98, in initialize_gateway\n gateway=(network_ref[\'gateway\'] is not None))\n', ' File "/opt/stack/nova/nova/network/linux_net.py", line 900, in plug\n return _get_interface_driver().plug(network, mac_address, gateway)\n', ' File "/opt/stack/nova/nova/network/linux_net.py", line 1160, in plug\n run_as_root=True)\n', ' File "/opt/stack/nova/nova/utils.py", line 201, in execute\n cmd=\' \'.join(cmd))\n', "ProcessExecutionError: Unexpected error while running command.\nCommand: sudo /usr/local/bin/nova-rootwrap ip address add 10.0.0.1/24 dev brq744ec2f4-c0\nExit code: 254\nStdout: ''\nStderr: 'RTNETLINK answers: File exists\\n'\n"]
My guess is that this can be solved with the nova configuration. Sadly I am not too familiar with these. Any help would be great. 
Thanks
Gary

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