10.2. Introducing Redundancy Protocols
Redundancy protocols work by giving you a way to configure more than one router to appear as one single router. This makes client configuration and communication easier because you can configure a single default gateway and the host machine can use its standard protocols to talk.
How does a redundancy protocol accomplish this? The protocols that I am going to describe for you do this basically by presenting a virtual router to all of the clients. The virtual router has its own IP and MAC addresses. The IP address is the address that is configured on each of the host machines as the default gateway. The virtual MAC address is the address that will be returned when an ARP request is sent by a host. The hosts ...
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