Once Upon a time at&T eyes Flexibility Cost Savings With New Network Design", Wall Street journaL, 2014 Upgrade their internal network infrastructure(routers and switches) every 18 months to keep up with the current demands for network Cost billions USd to upgrade Cisco top of the line switch cost $27K USD Other high cost: Involved many men power to upgrade the network In Summary: at&T was eyeing for SDN capable switches(only $11K USD each)Once Upon a Time • “AT&T Eyes Flexibility, Cost Savings With New Network Design”, Wall Street journal, 2014. • Upgrade their internal network infrastructure (routers and switches) every 18 months to keep up with the current demands for network. • Cost Billions USD to upgrade. • Cisco top of the line switch cost $27K USD • Other high cost: Involved many men power to upgrade the network. • In Summary: AT&T was eyeing for SDN capable switches (only $11K USD each)