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 Enabling NSX L2 Gateway Plugin in DevStack
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Following steps are meant for L2GW service in neutron for stable/mitaka* release onwards.

- Download DevStack

- Add networking-l2gw repo as an external repository and configure following flags in ``local.conf``::

     [[local|localrc]]
     enable_plugin networking-l2gw https://github.com/openstack/networking-l2gw
     ENABLED_SERVICES+=l2gw-plugin

- For NSX|v3 include the following additional flags in ``local.conf``::

     [[local|localrc]]
     NETWORKING_L2GW_SERVICE_DRIVER=L2GW:vmware-nsx-l2gw:vmware_nsx.services.l2gateway.nsx_v3.driver.NsxV3Driver:default
     DEFAULT_BRIDGE_CLUSTER_UUID=

- For NSX|V include the following additional flags in ``local.conf``::

     [[local|localrc]]
     NETWORKING_L2GW_SERVICE_DRIVER=L2GW:vmware-nsx-l2gw:vmware_nsx.services.l2gateway.nsx_v.driver.NsxvL2GatewayDriver:default

- Run ``stack.sh``

\* Configuration for stable/liberty release in ``local.conf``::

     [[local|localrc]]
     enable_plugin networking-l2gw https://github.com/openstack/networking-l2gw
     NSX_L2GW_DRIVER='vmware_nsx.services.l2gateway.nsx_v3.driver.NsxV3Driver' # NSXv3 driver
     NSX_L2GW_DRIVER='vmware_nsx.services.l2gateway.nsx_v.driver.NsxvL2GatewayDriver' # NSX|V driver
     Q_SERVICE_PLUGIN_CLASSES=vmware_nsx_l2gw
     DEFAULT_BRIDGE_CLUSTER_UUID=