[root@compute-1 ~]# cat /var/tmp/os-net-config_tests/config-vlan.yaml
network_config:
- type: linux_bridge
  name: br0
  use_dhcp: false
  members:
  - type: interface
    name: nic5

[root@compute-0 ~]# os-net-config -p nmstate -m /var/tmp/os-net-config_tests/mapping.yaml -c /var/tmp/os-net-config_tests/config-vlan.yaml -d --exit-on-validation-errors
...
2025-10-22 11:55:19.458 INFO os_net_config.impl_nmstate._add_common Using NetworkManager, nm_controlled is always true.Deprecating it from next release
2025-10-22 11:55:19.459 ERROR os_net_config.config_provider nmstate: ***Failed to configure network_config ***
'NmstateNetConfig' object has no attribute 'linuxbridge_data'
Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/os_net_config/cli.py", line 643, in config_provider
    provider.add_object(obj)
  File "/usr/lib/python3.9/site-packages/os_net_config/__init__.py", line 136, in add_object
    self.add_linux_bridge(obj)
  File "/usr/lib/python3.9/site-packages/os_net_config/impl_nmstate.py", line 2494, in add_linux_bridge
    self.linuxbridge_data[bridge.name] = data
AttributeError: 'NmstateNetConfig' object has no attribute 'linuxbridge_data'

ipdb> c
2025-10-22 11:58:57.313 ERROR os_net_config.config_provider nmstate: ***Failed to configure network_config ***
'NmstateNetConfig' object has no attribute 'linuxbridge_data'
Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/os_net_config/cli.py", line 643, in config_provider
    provider.add_object(obj)
  File "/usr/lib/python3.9/site-packages/os_net_config/__init__.py", line 136, in add_object
    self.add_linux_bridge(obj)
  File "/usr/lib/python3.9/site-packages/os_net_config/impl_nmstate.py", line 2495, in add_linux_bridge
    self.linuxbridge_data[bridge.name] = data
AttributeError: 'NmstateNetConfig' object has no attribute 'linuxbridge_data'

[root@compute-0 ~]# grep -Rn linuxbridge_data /usr/lib/python3.9/site-packages/os_net_config/impl_nmstate.py 
2494:        self.linuxbridge_data[bridge.name] = data

[root@compute-0 ~]# egrep -Hn "linuxbridge|linux_bridge" /usr/lib/python3.9/site-packages/os_net_config/impl_ifcfg.py 
/usr/lib/python3.9/site-packages/os_net_config/impl_ifcfg.py:198:        self.linuxbridge_data = {}
/usr/lib/python3.9/site-packages/os_net_config/impl_ifcfg.py:608:        if base_opt.linux_bridge_name:
/usr/lib/python3.9/site-packages/os_net_config/impl_ifcfg.py:609:            data += "BRIDGE=%s\n" % base_opt.linux_bridge_name
/usr/lib/python3.9/site-packages/os_net_config/impl_ifcfg.py:1053:    def add_linux_bridge(self, bridge):
/usr/lib/python3.9/site-packages/os_net_config/impl_ifcfg.py:1061:        self.linuxbridge_data[bridge.name] = data
/usr/lib/python3.9/site-packages/os_net_config/impl_ifcfg.py:1810:        for bridge_name, bridge_data in self.linuxbridge_data.items():

[root@compute-1 ~]# os-net-config -p ifcfg -m /var/tmp/os-net-config_tests/mapping.yaml -c /var/tmp/os-net-config_tests/config-vlan.yaml --exit-on-validation-errors -d
...
2025-10-22 11:31:56.144 DEBUG os_net_config.impl_ifcfg.apply enp130s0f2: Calling stop_dhclient_interfaces()
2025-10-22 11:31:56.144 INFO os_net_config.execute running ifup on interface: enp130s0f2
2025-10-22 11:31:56.236 ERROR os_net_config.execute stderr : WARN      : [ifup] You are using 'ifup' script provided by 'network-scripts', which are now deprecated.
WARN      : [ifup] 'network-scripts' will be removed from distribution in near future.
WARN      : [ifup] It is advised to switch to 'NetworkManager' instead - it provides 'ifup/ifdown' scripts as well.

2025-10-22 11:31:56.242 INFO os_net_config.config_provider ifcfg: Successfully configured network_config
2025-10-22 11:31:56.245 INFO os_net_config.main ifcfg: Configured network_config successfully

[root@compute-1 ~]# ip a sh br0
38: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether f8:f2:1e:33:04:e2 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::f407:1ff:fe75:16bd/64 scope link 
       valid_lft forever preferred_lft forever