With the growing popularity of cloud computing

the traditional extended multi-layer structure of a single IT system network

like a chimney "sandwich"

can not meet the requirements of large-scale multi-tenant and multi-system in data center.In this paper

refer to Cisco and H3C VMDC network architecture

design points of compacted multi-layer structure for multi-tenant IT system data center network

which includes flattening network architecture

no differentiated access

etc

is mentioned.The design points are introduced by the use of the design of an actual project.Practice proved that through the use of compacted multi-layer structure design

can effectively improve the network device port

bandwidth utilization

and to meet the needs of multi-system security domain isolation and resource sharing.