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the extra interface is the FIP (floating IP namespace), this interface makes snat/dnat in the router namespace north-south in compute hosts, the allow the floating IP traffic goes outside directly from compute nodes and not need to flow through neutron nodes.

The interface in qrouter (rfp-*) is the patch link to the FIP namespace (patch fpr).

This is the reason of needing a external bridge in compute hosts, and the usage of a free floating IP per router/node.

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