Cisco is, of course, working closely with VMware, as well as Red Hat and other virtualization vendors to create virtual machines capable of hosting mission-critical applications. "Pretty much every hypervisor under the Sun is supported on the UCS (Cisco's Unified Computing System)," Bugnion says. But Cisco has gone even further with VMware and Red Hat, announcing last week that Cisco's Virtual Network Link (VN-Link) technology is now integrated with Red Hat Enterprise Virtualization. (This integration already existed with VMware). During a press conference that featured both Bugnion and Red Hat officials, the Red Hat executives criticized the VMware hypervisor, saying it is based on 15-year-old technology that is not well adapted to the cloud computing age. Bugnion did not take sides in that battle, saying, "It's certainly a point that Red Hat would make and it's a point that VMware would not agree to."