Cisco is buying networking Topspin for $250 million in cash and options.

Topspin sells programmable server switches used in systems from vendors including Dell, HP, IBM and Sun. It made the news last year by incorporating Infinband into its switches. By buying it, Cisco's picks up those switches, which were previously lacking in its product line.

Cisco said it will add Topspin to its Data Center, Switching and Wireless Technology Group, headed by Luca Cafiero. Mr Cafiero had this to say: "The widespread adoption of server architectures such as blades, grid computing, and clustered applications is driving an emerging market opportunity within the data centre. As our customers build out these new computing environments, it is important that we deliver server networking technologies to fit their needs.

"By adding Topspin’s server fabric switches and virtualisation software, alongside our industry leading portfolio of Ethernet and SAN switches we are able to offer our customers compelling end-to-end data center switching capabilities."

Cisco expects to complete the acquisition by the end of July.