Until recent years, traditional data centers with a typical 3-layer architecture Core – Aggregation/Distribution – Access have become the common design model of many enterprises. The reason for its popularity is that it provides a hierarchical structure, offers high-speed packet switching between modules, and is flexible with the physical infrastructure.
However, over time, this traditional network model is losing its mentioned capability because:
- The module is costly,
- Traffic is complex and resource-intensive, not optimized,
- The invention of virtual servers is challenging its efficiency and flexibility,
- The maximum number of vlans (4096 according to IEEE 802.1Q) leads to limited capacity, especially when enterprises want to scale up their data center, business performance,and meet their tenants’ increasing demands,
- The abilities to monitor the system and display traffic are limited,
- Error detection and handling are not as efficient.