Modular data center （ MDC ）， which encapsulates thousands of servers and switches into a shipping-container ， is a future development trend of data center networks. This paper proposes a new MDC model with full-structure named EBSN. The logical structure of EBSN is an orthogonal of two Biswapped networks ， and the physical implementation of EBNS needs only a small amount of commercial off-the-shelf ， and thus a good network structure of EBSN is ensured. As for the network architecture of EBSN ， server-centric approach is taken ， and routing protocol is performed only on servers. In EBSN ， source routing and re-routing algorithms are specially designed to ensure the throughput and fault tolerance of EBSN. Simulated results indicate that ， in comparison with BCube ， EBSN is of full-structure ， reasonable throughput and good fault tolerance ， so that it is viable for MDC.