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This is because the servers are virtualized, yet the network is stillpurely a physical network. Even when we are configuring something virtual for the network, suchas a VLAN, making changes is more cumbersome than in their server counterparts. In Chapter 1 weexplained that although the control plane of legacy networks had sophisticated ways of autonomouslyand dynamically distributing layer two and layer three states, no corresponding protocols exist for distributing the policies that are used in policy-based routing. Thus, configuring security policy, such asACLs or virtualization policy such as to which VLAN a host belongs, remains static and manual intraditional networks. Therefore, the task of reconfiguring a network in a modern data center does nottake minutes but rather days. Such inflexible networks are hindering IT administrators in their attemptsto automate and streamline their virtualized data center en vironments. SDN holds the promise that thetime required for such network reconfiguration be reduced to the order of minutes, such as is alreadythe case for reconfiguration of VMs.
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