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The teardown_unused_network_gateway parameter=true parameters is used by
VlanManager in nova-network to remove bridge and vlan interfaces when
the network is deleted. With CentOS 6.5 these interfaces are not delete
bridge. In the log there are right lines:

2014-12-12 14:50:33.957 4606 DEBUG nova.openstack.common.processutils [req-8f33392b-db62-462c-a6b5-8008b7ea5412 ] Running cmd (subprocess): sudo nova-rootwrap /etc/nova/rootwrap.conf ip link delete br204 execute /usr/lib/python2.6/site-packages/nova/openstack/common/processutils.py:154
2014-12-12 14:50:32.881 4606 DEBUG nova.network.linux_net [req-3ec984c3-fbab-45c2-9002-057a6e3306a2 None] Net device removed: 'br204' delete_net_dev /usr/lib/python2.6/site-packages/nova/network/linux_net.py:1361

But actually the bridge interface still exists:

154: br204: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
    inet 10.42.1.3/24 brd 10.42.1.255 scope global br204
    inet 10.42.2.3/24 brd 10.42.2.255 scope global br204
    inet6 fe80::109d:f0ff:feb2:9d64/64 scope link
       valid_lft forever preferred_lft forever

The command fails in the shell:

[root@node-77 ~]# ip link delete br204
RTNETLINK answers: Operation not supported
[root@node-77 ~]# echo $?
2

This bug is not a nova-network issue, but rather a problem with linux
kernel: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=680094 , but
can be fixed in nova-network by replacing "ip link delete" command with
"ip link set <dev> down &&  brctl delbr <dev>"  commands

** Affects: nova
     Importance: Undecided
     Assignee: Marian Horban (mhorban)
         Status: In Progress


** Tags: nova-network
-- 
nova network on multihost does not delete bridges during deletion of networks
https://bugs.launchpad.net/bugs/1424756
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