Host interconnection provided by the physical network infrastructure has to cope with an increasing demand of resources requested by the VMs. Furthermore data centers have to host many tenants with its independently assigned network resources leading to a possible duplication of MAC addresses and VLAN Ids on the physical network. The IETF draft __VXLAN: A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks__ addresses these issues. It provides a layer 2 network environment over a layer 3 network. This enables the host to provide each tenant with its own networking domain. This is achieved without modifying any network packet originated from a VM. The discussion explains the setup of such tenant network domain using the Linux VXLAN device, spanning several hosts located in different areas. The focus is VM creation/shutdown and migration. [ Ссылка ]
