Former Cisco CEO John Chambers taking on Cisco at startup Nile
Nile's founders, John Chambers, left, and Pankaj Patel, have worked together for almost 25 years.NileIn his two decades running Cisco, John Chambers turned a computer networking upstart into one of the world's most dominant tech companies, with close to $50 billion in annual revenue and giant customers across the globe.Now, seven years removed from selling switches and routers, Chambers is challenging his former employer with a startup that's coming out of stealth mode on Wednesday. Chambers, 73, has teamed up with…