Fig. 2: Large-scale optical DCN based on the proposed optical switching and control system.
From: Nanosecond optical switching and control system for data center networks
The total N × N racks are divided into N clusters in the large-scale optical DCN. The two NICs at each ToR can be divided into two categories: NIC of intra cluster (intra-NIC) and NIC of inter cluster (inter-NIC). The N N × N intra-cluster optical switches (IS) connecting the intra-NICs in the same cluster are dedicated for the intra-cluster traffic communication. The inter-NIC of the i-th ToR in different cluster are interconnected by the i-th (1 ≤ i ≤ N) inter-cluster optical switch (ES), which are responsible for the forwarding of inter-cluster traffic.
