neutron/releasenotes/notes/change_external_network_bri...

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YAML

---
prelude: >
The default value for 'external_network_bridge' in the L3 agent is now ''.
upgrade:
- The default value for 'external_network_bridge' has been changed to ''
since that is the preferred way to configure the L3 agent and will be the
only way in future releases. If you have not explicitly set this value
and you use the L3 agent, you will need to set this value to 'br-ex' to
match the old default.
If you are using 'br-ex', you should switch to '', ensure your external
network has a flat segment and ensure your L2 agent has a bridge_mapping
entry between the external network's flat segment physnet and 'br-ex' to
get the same connectivity. If the external network did not already have
the flat segment, you will need to detach all routers from the external
networks, delete the incorrect segment type, add the flat segment, and
re-attach the routers.