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Set up connection between infra bridge and Neutron external bridge
Network topology used in CI multinode jobs is described In `Devstack documention
<https://opendev.org/openstack/devstack-gate/src/branch/master/multinode_setup_info.txt#L81>`_
In case when DVR is used, there is also additional bridge ``br-infra`` added
on each node to provide connectivity to floating IPs from main node.
This bridge needs to be connected with bridge used by Neutron as
external bridge. Typically it is ``br-ex`` and this role adds patch ports
between those bridges.
**Role Variables**
.. zuul:rolevar:: neutron_external_bridge_name
:default: br-ex
Name of the Neutron external bridge.
.. zuul:rolevar:: infra_bridge_name
:default: br-infra
Name of the infra bridge.
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