Under John McHugh, HP Networking came out of nowhere and went from relative obscurity to the No. 2 share vendor almost overnight. HP caught Cisco sleeping and managed to grab some share with value buyers at the access edge. Since then, Cisco has countered with purpose-built products that are more in line with HP pricing. HP then countered by acquiring 3Com to refresh its portfolio and challenge Cisco in the data center. Both companies are building integrated data center "stacks," so we should expect to see the once-great partners remain bitter rivals as the battle for the data center rages on.