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Cisco Networks: Engineers’ Handbook of Routing, Switching, and Security with IOS, NX-OS, and ASA by Noel Rivera, Richard Bedwell, William Wilson, Chris Carthern

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CHAPTER 13

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Introduction to Availability

This chapter discusses how to provide a high availability of systems, including network redundancy and fault tolerance. It covers protocols such as Hot Standby Router Protocol (HSRP), Virtual Router Redundancy Protocol (VRRP), and Gateway Load Balancing Protocol (GLBP) to increase network uptime. High availability is a requirement that companies use to keep mission-critical networks and applications available. Imagine if Amazon or Google had a four-hour outage. How much money would these companies lose because of this outage? Possibly millions of dollars. Thus you see the importance of high availability. ...

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