Core switches do not need to be stacked

Core switches are generally not stacked because stacking is primarily designed for access-layer switches, while core switches require high performance, redundancy, and independent control planes.Why Core Switches Are Typically Not StackedCore switches form the backbone of a network, handling large volumes of traffic and connecting distribution layers or aggregation points. Unlike access-layer switches, which benefit from simplified management and unified control through stacking, core switches prioritize high availability, scalability, and independent operation. Stacking multiple core switches can introduce limitations in throughput, increase failure domains, and complicate Layer 3 routing and redundancy protocols .Stacking OverviewSwitch stacking allows multiple physical switches to operate as a single logical device, sharing a management plane, control plane, and data plane. One switch acts as the master, managing configuration and forwarding tables, while other members synchronize with it . Stacking simplifies management and provides redundancy for access-layer switches but is generally limited in scale and flexibility, making it less suitable for core deployments .Alternatives for Core Switch RedundancyInstead of stacking, core switches often use MLAG (Multi-Chassis Link Aggregation) or HSRP/VRRP for redundancy. MLAG allows two or more independent switches to appear as a single logical endpoint for link aggregation, providing high availability and load balancing without merging control planes. This approach maintains independent operation of each core switch, which is critical for large-scale networks .SummaryStacking: Best for access-layer switches; simplifies management and provides redundancy within a limited stack.Core switches: Typically not stacked; require independent control planes, high throughput, and robust Layer 3 routing.Redundancy solutions: MLAG, HSRP, or VRRP are preferred for core switches to ensure high availability without the limitations of stacking . In essence, while stacking is useful for access or small-scale deployments, core switches are generally kept independent to maximize performance, reliability, and flexibility in enterprise networks.