High-Availability in a Virtual Environment

From the article:

Networking infrastructure equipment enjoys greater reliability by architecting for high availability (HA) and deploying a mix of commercial off-the-shelf (COTS) hardware as well as commercial and open source software components. Systems at the core and the edge of the network, once highly dependent upon custom and proprietary platforms, today build on standards-based carrier grade OSes, service availability forum APIs and AdvancedTCA hardware, and boast five and six nines of availability.

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