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multiple external networks are useful because it does not need operator to connect all of the related devices on one network. the operator can have one external network on AT&T device, another one on another vendor's.
Even if u have only one vendor, but with many external networks, u can divide quantum network nodes according to the way of their connection to that network. for example you can let each external network host a certain subnet...
the cost is to give gateway_external_network_id in l3_agent.ini file.
