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Are you running in multi-host mode? I ask because in non-multi-host mode (ie where nova-network is only run on the "cloud controller"), compute nodes will not have IP addresses on their bridges.

You can restart networking, but then you must immediately restart nova-network so it can rebuild all of the bridges. I recommend trying this out in a sandbox environment first if possible. I do not recommend doing this on a node that does not have nova-network running on it.

A less disruptive way might be to either:

  • remove the IP from the bridge (ip addr del dev br100) or
  • totally tear down the bridge and vlan devices

Then restart nova-network