Gartner: Businesses better off deploying multivendor networks, no matter what Cisco and other network vendors tell you. The firm compiled its data from “hundreds” of client interactions and in-depth interviews with nine public- and private-sector organizations. Cisco: A single-vendor Cisco network isn’t necessarily less complex, easier to manage or more reliable than a network with multiple vendors when implemented with best practices. A second networking vendor will reduce total cost of ownership for most organizations by at least 15% to 25% over five years.”]
Source: https://www.csoonline.com/article/2126737/gartner-slams-cisco-s-single-vendor-network-vision.html