Hi. I'm a new of OpenStack and getting started learning it.
I've been reading several documents, e.g., installation guide, administrator guide, etc, and I finally have doubts about how OpenStack could be scalable. According to the architecture design, like http://docs.openstack.org/security-guide/content/figures/8/static/1aa-network-domains-diagram.png, Network Node seems that it must be accessed before communicating to external network. It means that the Network Node seems having a role for forwarding and even routing packets so that the centralized design would cause congestion problem. If every data packets must pass through the Network Node, I think it is not reasonable design from the point of view of networking. My questions are; 1. Could multiple Network Nodes be set up in order to decentralize the traffic and avoid congestion? 2. If I misunderstood about the concept of Network Node, would you explain about it in detail? Thank you in advance! Best regards Byeong-Gi KIM
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