Why Legacy Campus Networks Architecture Don’t Work for a Digital Enterprise? Legacy campus network architectures were designed for an era where users were connecting to applications within local or remote data centers. The architecture was built with proprietary Layer 2/Layer 3 switch appliances and had to be refreshed every few years. Many complex and failure prone proprietary technologies like Virtual Chassis, Multi Chassis LAG, Fabric Path, ISSU are deployed which creates vendor lock in and increases the capital and operational expenses significantly. Various bolt-on approaches were used for security enforcement - in LAN access and WAN edge.

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