1. High Availability Network Fundamentals;Oggerino,2001
2. Top-Down Network Design;Oppenheimer,2010
3. Implementing Cisco IP Switched Networks (SWITCH) Foundation Learning Guide: Foundation Learning for SWITCH 642- 813;Froom,2010
4. Rolf McClellan, Nick Lippis “Network-Level Redundancy/Resilience for High-Availability Campus LANs”,” ZDTag white paper”, 1999, pp 6-8.
5. Mike Miclot, John Mower, “Reducing the Risk, Cost and Frequency of Production Stoppages Using Network Redundancy”, 2010.