IT-based technologies were not designed for the rigorous demands of the carrier network. IT reliability is usually measured in terms of two 9s or three 9s, whereas five 9s and six 9s are required in the carrier market.
Carrier grade availability and reliability; improved node and VM failure detection over IT solutions
Fast, secure VM failover (50–100x faster than IT virtualization)
Improved security with VM protection groups—not available in IT solutions