OSI layer 2 (data link layer, e. Ethernet frame in LANs or multi-link PPP in WANs, Ethernet MAC address) aggregation typically occurs across switch ports, which can be either physical ports or virtual ones managed by an operating system. The three layers of a traditional three-layer network design are the core layer, aggregation layer, and access layer. As the physical part of the aggregation layer, aggregation switches typically play a. In computer networking, link aggregation is the combining (aggregating) of multiple network connections in parallel by any of several methods. Link aggregation increases total bandwidth beyond what a single connection could sustain, and provides redundancy where all but one of the physical links. Access layer switches are primarily deployed in Layer 2 mode in the data center. A Layer 2 access topology provides the following unique capabilities required in the data center: VLAN extension—The Layer 2 access topology provides the flexibility to extend VLANs between switches that are connected. Switch aggregation refers to the concept of consolidating multiple access layer switches into a single aggregation layer switch in a traditional three-tier network design. It facilitates the connectivity because it would rapidly become impractical to.
