Software-defined networking
SDN is one of the key capabilities that differentiates OpenStack from traditional virtualization deployments. SDN uses tunneling technology to create a virtual network topology on top of a physical network topology. The virtual (overlay) networks can be shared or tenant-specific. Tenants can define their own layer 2 segments and routers, they can specify network-specific DNS and DHCP services, and some deployments allow for layer 4 services such as load balancing and firewalling to be defined as well. Neutron was created with a plugin-based architecture, and plugins exist for software and hardware-based SDN products. A reference implementation built around Open vSwitch is also provided for testing and lab work. ...
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