Collapsed Core Architecture: A Simplified Network Design for Smaller Networks

 Collapsed Core Network

A collapsed core network (also known as a collapsed backbone or collapsed core architecture) is a simplified version of a traditional enterprise network design. It merges the core and distribution layers of the network into a single layer, typically for smaller or medium-sized networks where a complete three-tier architecture is unnecessary.

Traditional Three-Tier Network Architecture:

Access Layer – Connects end devices like PCs, printers, and phones.

Distribution Layer – Aggregates access layer switches, applies policies, and routes between VLANs.

Core Layer – High-speed backbone that connects distribution layers and provides fast transport across the network.

Collapsed Core Architecture:

In a collapsed core, the core and distribution layers are combined into a single layer, typically using high-performance switches or routers.

Key Characteristics:

• Simplified design – Fewer devices and layers to manage.
• Cost-effective – Reduces hardware and operational costs.
• Easier management – Less complexity in configuration and troubleshooting.
• Suitable for smaller networks – Ideal for small campuses, branch offices, or SMBs.

Advantages:

• Lower latency due to fewer hops.
• Reduced cost in hardware and maintenance.
• Simplified troubleshooting and network design.
• Scalability for moderate growth.

Considerations:

• Limited scalability compared to full three-tier designs.
• Single point of failure if redundancy isn’t properly implemented.
• Performance bottlenecks occur if the collapsed core device is overloaded.